For Gas Safe registered engineers

Boiler NTC thermistor resistance

How to test a boiler's NTC temperature sensor with a multimeter, and the resistance tables to check it against: 242 tables from 220 manufacturer manuals across 24 makes, each with the manual page it came from.

What you're testing

The flow, return, hot water and flue sensors on most boilers are NTC thermistors: their resistance falls as they get hotter. The PCB reads that resistance and works out the temperature from it. A sensor that has drifted makes the boiler think the water is hotter or colder than it is, which shows up as short cycling, lukewarm hot water, overheat lockouts or a sensor fault code.

Flow, return and hot water sensors are most often 10 kΩ at 25 °C, but 12 kΩ is common too: Intergas uses it, and so do some Worcester and Viessmann ranges. Flue and outdoor sensors are often different again. Check which sensor you're on, and use that boiler's own table.

How to test a boiler thermistor with a multimeter

Isolate the boiler electrically and prove it dead. Let it cool if you need to handle the sensor.
Unplug the sensor at its connector, so the PCB isn't in the reading.
Set the meter to resistance and measure across the two sensor terminals.
Measure the temperature at the sensor with a contact or pipe thermometer. A cold boiler at room temperature is the easiest reference point.
Look up the expected resistance at that temperature in the table for that boiler, and compare.

An open circuit (OL on the meter) or a reading near zero means a failed sensor or a broken lead. A reading that's well away from the table at the measured temperature points at the sensor. If the sensor reads right at the connector, check the lead and the connector at the PCB end before you condemn the board. A strap-on sensor that has come loose from the pipe reads wrong too, so check the fixing before you change one.

Where the boiler's manual gives its own sensor test procedure, follow that.

What a 10k curve looks like

°C	0	10	20	25	30	40	50	60	70	80
Ω	27,000	17,000	12,000	10,000	8,000	5,000	4,000	3,000	2,000	1,500

A 10k flow sensor, from the GENUS HE Gas fired condensing wall hung combination boilers manual, page 54. Use the table for the boiler you are on: curves differ between makers.

Tables by make

Every table here was checked against the manual page it came from: each value is printed on that page, and the values behave like a real NTC sensor. Where a manual only gives a graph, or a table we couldn't read reliably, it isn't shown. Ideal and some other makers print three check points as ranges rather than a full table; those are shown as printed. Full tables are in ohms.

Ariston

CLAS HE EVO / CLAS HE EVO System

Covers: Clas HE 24, Clas HE 28, Clas HE 35

NTC Sensor Resistance (NTC1 Black / NTC2 Red) NTC 10k

°C	0	10	20	25	30	40	50
Ω	27,000	17,000	12,000	10,000	8,000	5,000	4,000

From manual 420010620100, page 58.

Clas HE Evo / Clas HE Evo System

Covers: Clas HE Evo

NTC Sensor Resistance Values NTC 10k

°C	0	10	20	25	30	40	50
Ω	27,000	17,000	12,000	10,000	8,000	5,000	4,000

From manual 420010439400, page 59.

CLAS HE R 12 - 18 - 24

Covers: Clas HE R 12, Clas HE R 18

NTC sensor resistance NTC 10k

°C	0	10	20	25	30	40	50
Ω	27,000	17,000	12,000	10,000	8,000	5,000	4,000

From manual 420010128500, page 53.

CLAS HE SYSTEM

Covers: Clas HE 18 System, Clas HE 24 System, Clas HE System 30

NTC1 / NTC2 sensor resistance NTC 10k

°C	0	10	20	25	30	40	50
Ω	27,000	17,000	12,000	10,000	8,000	5,000	4,000

From manual 420010097205, page 51.

CLAS ONE R 24

Covers: Clas ONE R

NTC1 : Black / NTC2: Red sensor resistance NTC 10k

°C	0	10	20	25	30	40	50
Ω	27,000	17,000	12,000	10,000	8,000	5,000	4,000

From manual 420011055500, page 46.

Clas System 28 (System)

Covers: Clas System 28

Temperature sensors & overheat thermostat sensor resistance NTC 10k

°C	0	10	20	25	30	40	50	60	70	80
Ω	27,000	17,000	12,000	10,000	8,000	5,000	4,000	3,000	2,000	1,500

From manual 420010108501, page 55.

CONDENSING WALL-HUNG GAS BOILER CLAS NET One / CLAS One / CLAS SYSTEM One

Covers: Clas ONE System

NTC1 / NTC2 sensor resistance NTC 10k

°C	0	10	20	25	30	40	50
Ω	27,000	17,000	12,000	10,000	8,000	5,000	4,000

From manual 420010818500, page 58.

E-COMBI EVO / E-SYSTEM EVO

Covers: E-Combi Evo

NTC Sensor Resistance Values NTC 10k

°C	0	10	20	25	30	40	50
Ω	27,000	17,000	12,000	10,000	8,000	5,000	4,000

From manual 420010620300, page 58.

E-SYSTEM ONE

Covers: E-Combi One Combi, E-Combi One System, E-System ONE

NTC1 / NTC2 sensor resistance NTC 10k

°C	0	10	20	25	30	40	50
Ω	27,000	17,000	12,000	10,000	8,000	5,000	4,000

From manual 420020162200, page 58.

EGIS HE

Covers: Egis HE 24

Temperature sensors resistance table NTC 10k

°C	0	10	20	25	30	40	50
Ω	27,000	17,000	12,000	10,000	8,000	5,000	4,000

From manual 420010462500, page 51.

GENUS HE Gas fired condensing wall hung combination boilers

Covers: Genus HE 24, Genus HE 30, Genus HE 38

TEMPERATURE SENSORS & OVERHEAT THERMOSTAT sensor resistance NTC 10k

°C	0	10	20	25	30	40	50	60	70	80
Ω	27,000	17,000	12,000	10,000	8,000	5,000	4,000	3,000	2,000	1,500

From manual 420010096302, page 54.

GENUS ONE Net

Covers: Genus ONE Net

NTC1 / NTC2 sensor resistance NTC 10k

°C	0	10	20	25	30	40	50
Ω	27,000	17,000	12,000	10,000	8,000	5,000	4,000

From manual 420010963800, page 57.

Atag

A200SOV Open vent heat only boiler

Covers: Sov.

NTC 10k Resistance Table NTC 10k

°C	0	10	20	25	30	40	50	60	70	80	90
Ω	32,555	19,873	12,488	10,000	8,059	5,330	3,605	2,490	1,753	1,256	915

From manual 8G.51.70.02/08.11, page 21.

ATAG A-Series

Covers: A200S, A320S

Flow sensor T1, Return sensor T2, DHW sensor T3, Flue sensor T5 sensor resistance NTC 10k

°C	-10	0	10	12	14	16	18	20	22	24	26	28	30	32	34	36	38	42	44	46	48	50	52	54	58	62	64	66	68	70	72	74	76	78	80	82	84	86	88	90
Ω	55,047	32,555	19,873	18,069	16,447	14,988	13,674	12,488	11,417	10,449	9,573	8,779	8,059	7,406	6,811	6,271	5,779	4,921	4,547	4,205	3,892	3,605	3,343	3,102	2,677	2,318	2,159	2,013	1,878	1,753	1,638	1,531	1,433	1,341	1,256	1,178	1,105	1,037	974	915

From manual 8G.51.59.05/08.11, page 26.

ATAG iC-Range

Covers: i24C, i28C, i40C, iC Economiser 35 Plus, iC Economiser 39 Plus

Flow sensor T1, Return sensor T2, DHW sensor T3 sensor resistance NTC 10k

°C	-10	0	10	12	14	16	18	20	22	24	26	28	30	32	34	36	38	42	44	46	48	50	52	54	58	62	64	66	68	70	72	74	76	78	80	82	84	86	88	90
Ω	55,047	32,555	19,873	18,069	16,447	14,988	13,674	12,488	11,417	10,449	9,573	8,779	8,059	7,406	6,811	6,271	5,779	4,921	4,547	4,205	3,892	3,605	3,343	3,102	2,677	2,318	2,159	2,013	1,878	1,753	1,638	1,531	1,433	1,341	1,256	1,178	1,105	1,037	974	915

From manual 8G.51.84.01 / 03.19, page 38.

NTC sensor resistance table (Flow T1, Return T2, DHW T3 - 10kOhm) NTC 10k

°C	-10	0	10	20	25	26	28
Ω	55,047	32,555	19,873	12,488	10,000	9,620	8,920

From manual 8G.51.84.01 / 03.19, page 38.

NTC sensor resistance table (Flow/Return/DHW NTC10k) NTC 10k

°C	-10	0	10	20	25	30	40	50	60	70	80	90
Ω	55,047	32,555	19,873	12,488	10,000	8,059	5,330	3,605	2,490	1,753	1,256	915

From manual 8G.51.84.01 / 03.19, page 38.

ATAG iC-Range

Covers: iC 40 47-310-25 iC 40 LPG, iC Economiser 27, iC Economiser 35, iC Economiser 39, iC36

Outside sensor T4, Flow sensor T1, Return sensor T2, DHW sensor T3, Flue sensor T5 (NTC10k) sensor resistance NTC 10k

°C	-10	0	10	12	14	16	18	20	22	24	26	28	30	32	34	36	38	42	44	46	48	50	52	54	58	62	64	66	68	70	72	74	76	78	80	82	84	86	88	90
Ω	55,047	32,555	19,873	18,069	16,447	14,988	13,674	12,488	11,417	10,449	9,573	8,779	8,059	7,406	6,811	6,271	5,779	4,921	4,547	4,205	3,892	3,605	3,343	3,102	2,677	2,318	2,159	2,013	1,878	1,753	1,638	1,531	1,433	1,341	1,256	1,178	1,105	1,037	974	915

From manual 8G.51.80.00 / 03.15, page 34.

ATAG iC-Range

Covers: iC28

Flow sensor T1 sensor resistance NTC 10k

°C	-10	0	10	12	14	16	18	20	22	24	26	28	30	32	34	36	38	42	44	46	48	50	52	54	58	62	64	66	68	70	72	74	76	78	80	82	84	86	88	90
Ω	55,047	32,555	19,873	18,069	16,447	14,988	13,674	12,488	11,417	10,449	9,573	8,779	8,059	7,406	6,811	6,271	5,779	4,921	4,547	4,205	3,892	3,605	3,343	3,102	2,677	2,318	2,159	2,013	1,878	1,753	1,638	1,531	1,433	1,341	1,256	1,178	1,105	1,037	974	915

From manual 8G.51.80.00 / 03.15, page 34.

ATAG iR-Range

Covers: i15R

Resistance table sensors ATAG iC-, iS- and iR-series NTC 1k

°C	-10	0	10	20	25	30	40
Ω	4,574	2,857	1,840	1,218	1,000	827	575

From manual 8G.51.85.01 / 03.19, page 35.

ATAG iS-Range

Covers: i15S, i18S, i24S, i32S, i40S

Flow sensor T1, Return sensor T2, DHW sensor T3 sensor resistance NTC 10k

°C	-10	0	10	12	14	16	18	20	22	24	26	28	30	32	34	36	38	42	44	46	48	50	52	54	58	62	64	66	68	70	72	74	76	78	80	82	84	86	88	90
Ω	55,047	32,555	19,873	18,069	16,447	14,988	13,674	12,488	11,417	10,449	9,573	8,779	8,059	7,406	6,811	6,271	5,779	4,921	4,547	4,205	3,892	3,605	3,343	3,102	2,677	2,318	2,159	2,013	1,878	1,753	1,638	1,531	1,433	1,341	1,256	1,178	1,105	1,037	974	915

From manual 8G.51.86.01 / 03.19, page 39.

Resistance table sensors ATAG iC-, iS- and iR-series NTC 1k

°C	-10	0	10	20	25	30	40	50	60	70	80	90
Ω	4,574	2,857	1,840	1,218	1,000	827	575	405	290	211	156	116

From manual 8G.51.86.01 / 03.19, page 39.

ATAG iS-Range

Covers: iS 12, iS 12 41-310-18 iS 12 LPG, iS15, iS18, iS24, iS32, iS40

NTC10k (25°C) sensor resistance NTC 10k

°C	-10	0	10	12	14	16	18	20	22	24	26	28	30	32	34	36	38	42	44	46	48	50	52	54	58	62	64	66	68	70	72	74	76	78	80	82	84	86	88	90
Ω	55,047	32,555	19,873	18,069	16,447	14,988	13,674	12,488	11,417	10,449	9,573	8,779	8,059	7,406	6,811	6,271	5,779	4,921	4,547	4,205	3,892	3,605	3,343	3,102	2,677	2,318	2,159	2,013	1,878	1,753	1,638	1,531	1,433	1,341	1,256	1,178	1,105	1,037	974	915

From manual 8G.51.82.03 / 01.16, page 37.

Resistance table sensors ATAG iC-, iS- and iR-series NTC 10k

°C	-10	0	10	20	25	30	40	50
Ω	55,047	32,555	19,873	12,488	10,000	8,059	5,330	3,605

From manual 8G.51.82.03 / 01.16, page 37.

Atmos

HE22

Covers: Interopen HE22

NTC resistances table (12 kOhm) NTC 12k

°C	-15	25	65	80	100
Ω	76,020	12,000	2,752	1,707	952

From manual 881987_Inst_InterOpenHE22, page 47.

HE26 & HE40C

Covers: Intersystem HE26, Intersystem HE40 C

NTC Sensor Resistance Table NTC 12k

°C	-15	0	25	50	80	100
Ω	76,020	36,130	12,000	4,609	1,707	952

From manual GC 41-249-05 & GC 41-249-07, page 47.

NTC resistances (NTC 12 kOhm / 25°C) NTC 12k

°C	-15	-10	-5	0	5	10	15	20
Ω	76,020	58,880	45,950	36,130	28,600	22,800	18,300	14,770

From manual GC 41-249-05 & GC 41-249-07, page 47.

HE32 Atmos Heating Systems

Covers: Intercombi HE32

NTC Sensor Resistance Table NTC 12k

°C	-15	-10	-5	0	5	10	15	20	25	30	35	40	45	50	55	60	65	70	75	80	85	90	95	100
Ω	76,020	58,880	45,950	36,130	28,600	22,800	18,300	14,770	12,000	9,805	8,055	6,653	5,522	4,609	3,863	3,253	2,752	2,337	1,994	1,707	1,467	1,266	1,096	952

From manual 881617_Inst_InterCombiHE32, page 51.

Baxi

& Boiler Fiche - Combi 2/2.1

Covers: 424 COMBI 2.1, 430 COMBI 2.1, 436 COMBI 2.1, ASSURE 524 COMBI 2, ASSURE 530 COMBI 2, ASSURE 536 COMBI 2

Temperature sensor outdoor sensor (NTC1000 Beta 3688 1 kOhm@25 º) NTC 1k

°C	-20	-16	-12	-8	-4	0	4	8	12	16	20	24
Ω	7,578	6,166	5,046	4,152	3,435	2,857	2,387	2,004	1,690	1,433	1,217	1,040

From manual 7875578-02, page 11.

Temperature flow/heating circuit return sensor (NTC10K Beta 3977 10 kOhm@25 º) NTC 10k

°C	0	10	20	25	30	40	50	60	70	80	90
Ω	32,505	19,854	12,483	9,999	8,060	5,332	3,608	2,492	1,754	1,257	915

From manual 7875578-02, page 11.

Flue gas temperature sensor (NTC20K Beta 3970 20 kOhm@25 º) NTC 20k

°C	0	10	20	25	30	40	50	60	70	80	90	100	110	120	130	140	150	160	170	180	190
Ω	66,050	40,030	25,030	20,000	16,090	10,610	7,166	4,943	3,478	2,492	1,816	1,344	1,009	768	592	461	364	290	233	189	155

From manual 7875578-02, page 11.

& Boiler Fiche 600 System 2

Covers: 615 System 2

NTC Flow/Return Sensor Resistance NTC 10k

°C	0	25	50	80
Ω	32,505	9,999	3,608	1,257

From manual 7801992 - 03, page 16.

& Boiler Fiche High-efficiency wall-hung condensing gas boiler 600 System 2 / 800 System 2 / Assure 500 System 2

Covers: 624 System 2

Outdoor sensor resistance NTC 1k

°C	-20	-16	-12	-8	-4	0	4	8	12	16	20	24
Ω	7,578	6,166	5,046	4,152	3,435	2,857	2,387	2,004	1,690	1,433	1,217	1,040

From manual 7875579-01, page 11.

Flow/heating circuit return sensor resistance NTC 10k

°C	0	10	20	25	30	40	50	60	70	80	90
Ω	32,505	19,854	12,483	9,999	8,060	5,332	3,608	2,492	1,754	1,257	915

From manual 7875579-01, page 11.

Flue gas sensor resistance NTC 20k

°C	0	10	20	25	30	40	50	60	70	80	90	100	110	120	130	140	150	160	170	180	190
Ω	66,050	40,030	25,030	20,000	16,090	10,610	7,166	4,943	3,478	2,492	1,816	1,344	1,009	768	592	461	364	290	233	189	155

From manual 7875579-01, page 11.

600 System 2 —

Covers: 600 System 2

NTC Temperature Sensor Resistance (Flow/Return 10k) NTC 10k

°C	0	25	50	80
Ω	32,505	9,999	3,608	1,257

From the installation and servicing manual, page 16.

Assure 518 System 2 & Boiler Fiche

Covers: Assure 518 System 2

Outdoor sensor resistance NTC 1k

°C	-20	-16	-12	-8	-4	0	4	8	12	16	20	24
Ω	7,578	6,166	5,046	4,152	3,435	2,857	2,387	2,004	1,690	1,433	1,217	1,040

From manual 7875579-01, page 11.

Flow/heating circuit return sensor resistance NTC 10k

°C	0	10	20	25	30	40	50	60	70	80	90
Ω	32,505	19,854	12,483	9,999	8,060	5,332	3,608	2,492	1,754	1,257	915

From manual 7875579-01, page 11.

Flue gas sensor resistance NTC 20k

°C	0	10	20	25	30	40	50	60	70	80	90	100	110	120	130	140	150	160	170	180	190
Ω	66,050	40,030	25,030	20,000	16,090	10,610	7,166	4,943	3,478	2,492	1,816	1,344	1,009	768	592	461	364	290	233	189	155

From manual 7875579-01, page 11.

Baxi 124 - 128 Combi Condensing Combination Boiler

Covers: 124 Combi, 128 Combi

CH and DHW sensors: 10kΩ @ 25° C (page 51)
Flue sensor: 20kΩ @ 25° C (page 51)
DHW and CH sensors: 10kΩ @ 25°C (resistance reduces with increase in temp.) (page 49)

Baxi 424 Combi 2 - 430 Combi 2 / 424 Combi LPG 2 - 430 Combi LPG 2

Covers: 424 Combi 2

Temperature sensor outdoor sensor (NTC1000 Beta 3419 1 kOhm @ 25 °C) NTC 1k

°C	-20	-15	-10	-5	0	5	10	15	20	25	30
Ω	7,578	5,861	4,574	3,600	2,857	2,284	1,840	1,492	1,218	1,000	827

From the installation and servicing manual, page 16.

Temperature flow/heating circuit return sensor (NTC10K Beta 3977 10KOhm@25°C) NTC 10k

°C	0	10	20	25	30	40	50	60	70	80	90
Ω	32,505	19,854	12,483	9,999	8,060	5,332	3,608	2,492	1,754	1,257	915

From the installation and servicing manual, page 16.

Flue gas temperature sensor (NTC20K Beta 3970 20kOhm@25°C) NTC 20k

°C	0	10	20	25	30	40	50	60	70	80	90	100	110	120	130	140	150	160	170	180	190
Ω	66,050	40,030	25,030	20,000	16,090	10,610	7,166	4,943	3,478	2,492	1,816	1,344	1,009	768	592	461	364	290	233	189	155

From the installation and servicing manual, page 16.

Baxi 600 Combi 2 High-efficiency wall-hung condensing gas boiler

Covers: 630 Combi 2

Outdoor sensor: Beta: 3435 K, 10kΩ at 25 °C (page 16)
Flow / return heating circuit sensor: Beta: 3435 K, 10kΩ at 25 °C (page 16)
Flue gas temperature sensor: Beta: 3435 K, 10kΩ at 25 °C (page 16)

Baxi Assure Combi

Covers: Assure 25 Combi, Assure 30 Combi, Assure 36 Combi

CH sensors: 10kΩ @ 25° C (resistance reduces with increase in temp.) (page 67)
DHW sensors: 10kΩ @ 25° C (resistance reduces with increase in temp.) (page 67)
Flue sensor: 20k Ω @ 25° C (resistance reduces with increase in temp.) (page 67)
Cold resistance approximately: 10kΩ @ 25° C (resistance reduces with increase in temp.) (page 67)

Baxi Assure System

Covers: Assure 15 System, Assure 24 System

CH sensors: 10kΩ @ 25° C (resistance reduces with increase in temp.) (page 58)
DHW sensors: 10kΩ @ 25° C (resistance reduces with increase in temp.) (page 58)
Flue sensor: 20kΩ @ 25° C (resistance reduces with increase in temp.) (page 58)
DHW and CH sensors: 10kΩ @ 25° C (resistance reduces with increase in temp.) (page 60)

Baxi Bermuda BBU 15 HE

Covers: Bermuda BBU 15 HE

Cold resistance: approx 10kΩ @ 25°C (page 38)

Baxi Combi 624 — 630

Covers: 624 Combi

NTC (CH/DHW): 10kΩ @ 25° C (approx) (page 69)
NTC (Flue): 20kΩ @ 25° C (approx) (page 69)

Baxi Duo-tec 24 - 28 - 33 - 40 Combi ErP / 28 LPG

Covers: Duo-tec 24 Combi ErP, Duo-tec 28 Combi ErP, Duo-tec 33 Combi ErP, Duo-tec 40 Combi ErP

NTC Sensor Resistance (Fault Finding)

Sensor Type	Resistance / Temperature
DHW and CH sensors	Cold resistance approximately 10kΩ @ 25° C
Flue sensor	20kΩ @ 25° C

As printed in manual 7647620-04, page 51.

Baxi Duo-tec Combi HE Range Gas Fired Wall Mounted Condensing Combination Boiler

Covers: Duo-tec Combi 24 HE, Duo-tec Combi 28 HE, Duo-tec Combi 33 HE

Cold resistance (DHW and CH sensors): 10kΩ @ 25° C (resistance reduces with increase in temp.) (page 54)
Cold resistance (Flue sensor): 20kΩ @ 25° C (resistance reduces with increase in temp.) (page 54)
DHW and CH NTC sensors: Approximately 10kΩ @ 25° C (resistance reduces with increase in temp.) (page 54)
Flue sensor: Approximately 20kΩ @ 25° C (resistance reduces with increase in temp.) (page 54)
DHW and CH sensors: Approximately 10kΩ @ 25° C (resistance reduces with increase in temp.) (page 54)

Baxi EcoBlue Advance Combi ErPD

Covers: EcoBlue Advance 24 Combi ErPD, EcoBlue Advance 33 Combi ErPD, EcoBlue Advance 40 Combi ErPD

CH & DHW sensor resistance: Approximately 10k Ω @ 25°C (resistance reduces with increase in temp.) (page 67)
Flue sensor resistance: Approximately 20k Ω @ 25°C (resistance reduces with increase in temp.) (page 67)
CH & DHW sensor: 10k Ω @ 25° C (page 67)
Flue sensor: 20k Ω @ 25° C (page 67)

Baxi Megaflo System ErP

Covers: Megaflo 15 System ErP, Megaflo 18 System ErP, Megaflo 24 System ErP

CH and DHW sensors: 10kΩ @ 25° C (page 46)
Flue sensor: 20kΩ @ 25° C (page 46)
Cold resistance approximately (DHW and CH sensors): 10kΩ @ 25° C (page 46)
Cold resistance approximately (Flue sensor): 20kΩ @ 25° C (page 46)

Baxi Platinum Combi 24 - 28 - 33 - 40

Covers: Platinum 28 Combi ErP, Platinum 33 Combi ErP

Cold resistance CH and DHW NTC sensors: approximately 10k Ω @ 25°C (page 51)
Cold resistance Flue sensor: approximately 20k Ω @ 25°C (page 51)
DHW and CH sensors: Cold resistance approximately 10k Ω @ 25° C (page 52)
Flue sensor: Cold resistance approximately 20k Ω @ 25° C (page 52)

Baxi Platinum Combi HE Range

Covers: Platinum 24 HE, Platinum 28 HE, Platinum 33 HE

NTC Sensor Resistance

Sensor Type	Resistance / Temp
DHW and CH sensors	Cold resistance approximately 10kΩ @ 25° C (resistance reduces with increase in temp.)
Flue sensor	Cold resistance approximately 20kΩ @ 25° C (resistance reduces with increase in temp.)

As printed in the installation and servicing manual, page 50.

Baxi Platinum Combi HE Range Gas Fired Wall Mounted Condensing Combination Boiler

Covers: Platinum Combi 28 HE, Platinum Combi 33 HE, Platinum Combi 40 HE

Temperature Sensors Resistance Table

Sensor	Cold Resistance
DHW and CH sensors	Approximately 10kΩ @ 25°C
Flue sensor	Approximately 20kΩ @ 25°C

As printed in manual 5121651, page 55.

Baxi Platinum+ 40 Combi

Covers: Platinum+ 40 Combi

DHW and CH sensors: 10kΩ @ 25° C (page 52)
Flue sensor: 20kΩ @ 25° C (page 52)

Baxi System HE Range Gas Fired Wall Mounted Condensing Boiler

Covers: Megaflo System 15 HE, Megaflo System 18 HE, Megaflo System 32 HE

Central Heating and DHW Sensors: 10kΩ @ 25° C (resistance reduces with increase in temp.) (page 50)
Flue Sensor: 20kΩ @ 25° C (resistance reduces with increase in temp.) (page 50)
Cold resistance approximately (DHW and CH sensors): 10kΩ @ 25° C (page 50)
Cold resistance approximately (Flue sensor): 20kΩ @ 25° C (page 50)

Duo-tec 2 Combi GA Range Gas Fired Wall Mounted Condensing Combination Boiler

Covers: Duo-tec 2 Combi 33 GA, Duo-tec 2 Combi 40 GA

CH and DHW sensors: approximately 10k Ω @ 25° C (resistance reduces with increase in temp.) (page 50)
Flue sensor: approximately 20k Ω @ 25° C (resistance reduces with increase in temp.) (page 50)
Cold resistance approximately: 10k Ω @ 25°C (resistance reduces with increase in temp.) (page 48)

Duo-tec Combi HE A Range Gas Fired Wall Mounted Condensing Combination Boiler

Covers: Duo-tec Combi 24 HE A, Duo-tec Combi 28 HE A, Duo-tec Combi 33 HE A, Duo-tec Combi 40 HE A

Cold resistance (DHW and CH sensors): approximately 10kΩ @ 25° C (page 54)
Cold resistance (Flue sensor): approximately 20kΩ @ 25° C (page 54)
DHW and CH sensors: Cold resistance approximately 10kΩ @ 25° C (page 54)
Flue sensor: Cold resistance approximately 20kΩ @ 25° C (page 54)

EcoBlue System

Covers: Ecoblue 12 System, Ecoblue 15 System, Ecoblue 18 System, Ecoblue 24 System, Ecoblue 32 System

CH Sensor: Cold resistance approximately 10k Ω @ 25°C (page 66)
Flue Sensor: Cold resistance approximately 20k Ω @ 25°C (page 66)
CH sensor: 10k ohm @ 25°C (resistance reduces with increase in temp.) (page 66)
Flue sensor: 20k ohm @ 25°C (resistance reduces with increase in temp.) (page 66)

EcoBlue System

Covers: EcoBlue System

CH sensor: 10k ohm @ 25°C (page 66)
Flue sensor: 20k ohm @ 25°C (page 66)

EcoBlue System Gas Fired Wall Mounted Condensing System Boiler

Covers: Ecoblue 28 System ErP, Ecoblue18 System ErP

CH sensor: 10k ohm @ 25°C (page 66)
Flue sensor: 20k ohm @ 25°C (page 66)

Megaflo System HE A Range

Covers: Megaflo System 15 HE A, Megaflo System 18 HE A, Megaflo System 24 HE A, Megaflo System 28 HE A, Megaflo System 32 HE A

DHW and CH sensors: Cold resistance approximately 10kΩ @ 25° C (page 51)
Flue sensor: Cold resistance approximately 20kΩ @ 25° C (page 51)
Cold resistance approximately (DHW and CH sensors): 10kΩ @ 25°C (page 51)
Cold resistance approximately (Flue sensor): 20kΩ @ 25°C (page 51)
DHW and CH sensors (Cold resistance): approximately 10kΩ @ 25° C (page 51)
Flue sensor (Cold resistance): approximately 20kΩ @ 25° C (page 51)
Cold resistance CH and DHW sensors: 10kΩ @ 25° C (page 51)
Cold resistance Flue sensor: 20kΩ @ 25° C (page 51)

Neta-tec Combi GA Range

Covers: Neta-tec Combi 24 GA, Neta-tec Combi 28 GA, Neta-tec Combi 33 GA

CH and DHW sensors: 10kΩ @ 25°C (resistance reduces with increase in temp.) (page 50)
Flue sensor: 20kΩ @ 25°C (resistance reduces with increase in temp.) (page 50)
DHW and CH sensors: 10kΩ @ 25°C (resistance reduces with increase in temp.) (page 50)

Platinum Combi HE A Range

Covers: Platinum Combi 28 HE A, Platinum Combi 33 HE A, Platinum Combi 40 HE A

Cold resistance (DHW and CH sensors): 10kΩ @ 25° C (page 55)
Cold resistance (Flue sensor): 20kΩ @ 25° C (page 55)
DHW and CH sensors: approximately 10kΩ @ 25° C (page 55)
Flue sensor: approximately 20kΩ @ 25° C (page 55)

Biasi

Advance Plus ERP

Covers: Advance Plus 25S ERP, Advance Plus 35C ERP

Temperature-resistance relationship (NTC Probes) NTC 10k

°C	20	30	40	50	60	70	80	90	100
Ω	12,000	8,000	5,500	3,800	2,600	1,800	1,250	900	650

From manual 1796225162, page 38.

Temperature-resistance relationship (NTC Probes) NTC 10k

°C	20	25	30	40	50	60	70	80	90	100
Ω	12,095	10,000	8,313	5,828	4,161	3,021	2,221	1,653	1,245	947

From manual 1796225162, page 38.

DINA Wall hung, fanflue, roomsealed, high efficiency gas boiler

Covers: Dina 35C M280C.3035 SM

NTC Temperature probe resistance relationship NTC 10k

°C	20	30	50	80	100
Ω	12,000	8,000	3,600	1,300	800

From the installation and servicing manual, page 40.

GARDA PLUS HE

Covers: Garda Plus HE M110B.32SM/E

Temperature-resistance relationship for NTC probes NTC 10k

°C	20	25	30	35	40	45	50	55	60	65	70	75	80	85	90	95	100
Ω	12,000	10,000	8,400	7,000	5,900	4,950	4,150	3,500	3,000	2,550	2,180	1,870	1,600	1,380	1,200	1,040	900

From manual 17962.1455.0, page 33.

Inovia

Covers: Inovia 25S, Inovia 30C

Temperature probe resistance relationship NTC 10k

°C	20	25	30	35	40	45	50	55	60	65	70	75	80	85	90	95	100
Ω	12,000	10,000	8,300	7,000	5,900	5,000	4,300	3,650	3,150	2,700	2,350	2,050	1,780	1,550	1,350	1,180	1,030

From manual 17962.2197.0, page 41.

Temperature probe / NTC resistance relationship NTC 10k

°C	20	25	30	40	50	60	70	80	90	100
Ω	12,000	10,000	8,400	5,800	4,100	3,000	2,200	1,600	1,200	900

From manual 17962.2197.0, page 41.

Inovia ERP

Covers: Inovia 25S ERP

Temperature probe resistance relationship NTC 10k

°C	20	25	50	100
Ω	12,000	10,000	3,600	1,000

From the installation and servicing manual, page 39.

RINNOVA ADAPTIVE

Covers: Rinnova Adaptive 35C M300V.3035 SM

Temperature-resistance relationship (NTC Probes) NTC 10k

°C	20	25	30	35	40	45	50	55	60	65	70	75	80	85	90	95	100
Ω	12,090	10,000	8,310	6,940	5,830	4,910	4,160	3,540	3,020	2,580	2,210	1,900	1,630	1,410	1,220	1,060	920

From manual 17962.3466.0, page 39.

Riva Compact HE

Covers: Riva Compact HE M96.28SR/C2

Temperature probe resistance relationship NTC 10k

°C	20	25	30	50	80	100
Ω	12,000	10,000	8,000	3,600	1,300	700

From manual 17962.1165.3, page 33.

Riva Plus HE

Covers: Riva Plus HE M296.24SM/C

Temperature probe resistance (C.H. / D.H.W. temperature probes) NTC 10k

°C	20	25	30	35	40	45	50	55	60	65	70	75	80	85	90	95	100
Ω	12,000	9,800	8,050	6,650	5,500	4,580	3,830	3,210	2,700	2,280	1,940	1,650	1,410	1,210	1,040	900	780

From manual 17962.1549.5, page 35.

Buderus

wall-mounted condensing gas boiler 600 - 28C

Covers: 600-28C

NTC Sensor Resistance Table NTC 10k

°C	0	5	10	15	20	25	30	35	40	45	50	55	60	65	70	75	80	85	90	95	100
Ω	29,490	23,462	18,787	15,136	12,268	10,000	8,197	6,754	5,594	4,656	3,893	3,271	2,760	2,339	1,990	1,700	1,458	1,255	1,084	940	817

From manual 7212 7900, page 53.

Chaffoteaux

Centora green 18-24

Covers: Talia Green 25

Thermistor Resistance Values NTC 5k

°C	25	40	80	110
Ω	5,000	2,631	620	255

From manual 1309033a, page 34.

Daikin

Daikin EKOMBG22AAV1, EKOMBG28AAV1 and EKOMBG33AAV1

Covers: EKOMBG 22

NTC resistances (NTC 12k Ohm) NTC 12k

°C	-15	-10	-5	0	5	10	15	20
Ω	76,020	58,880	45,950	36,130	28,600	22,800	18,300	14,770

From manual 2P369568-1B, page 53.

EKOMB22AAV1H, EKOMB28AAV1H, EKOMB33AAV1H

Covers: EKOMB 22 Combi

NTC resistances (12 kOhm) NTC 12k

°C	-15	-10	-5	0	5	10
Ω	76,020	58,880	45,950	36,130	28,600	22,800

From manual 2P369568-1B, page 54.

ECA

FELIS WALL TYPE CONDENSING BOILER

Covers: FELiS FL 65 HM GB

Surface Type NTC Resistance Table NTC 10k

°C	-10	0	10	20	25	30	40	50	60	70	80	90	100	110	120
Ω	55,170	32,600	19,880	12,480	10,000	8,050	5,320	3,600	2,490	1,750	1,260	920	688	510	390

From manual 7006721822_1.0, page 144.

Evo

evo HE C

Covers: HE C22/30

NTC Thermistor Resistance

Temp (C)	Resistance (Ohms)
25	9,700 - 10,300
60	2,400 - 2,600
85	1,000 - 1,100

As printed in manual UIN 204427 A02, page 61.

evo HE H

Covers: HE 12

Flow sensor resistance

Temperature (°C)	Resistance (Ω)
25	9700 - 10300
60	2400 - 2600
85	1000 - 1100

As printed in manual 201 029 A08, page 43.

Ferroli

DOMINA 80 E INSTALLATION, SERVICE AND

Covers: Domina 102

Temp. sensor NTC (34) (42) sensor resistance NTC 10k

°C	10	25	60	80
Ω	20,000	10,000	2,500	1,250

From manual 3543064/1, page 61.

Sigma Wall Mounted Cast Iron, Gas Fired Boiler

Covers: Sigma 40 FF

NTC Sensor Resistance Table

Temp	Resistance
25°C	1000 kOhm
60°C	185 kOhm
80°C	80 kOhm

As printed in the installation and servicing manual, page 17.

Sigma Wall Mounted Cast Iron, Gas Fired Boiler for Central Heating

Covers: Sigma 20-40, Sigma 40-60

NTC Sensor Resistance

Temperature	Resistance
25°C	1000 kOhm
60°C	185 kOhm
82°C	80 kOhm

As printed in manual cod. 3543556/1, page 19.

Glow-worm

Compact 75p

Covers: Compact 75p

Resistance: 10kΩ at 25°C (page 25)

Energysaver Combi 2

Covers: EnergySaver Combi

NTC Thermistor Resistance NTC 12k

°C	0	20	25	80	100
Ω	35,400	14,700	12,000	1,749	980

From manual 221854B, page 31.

XTRAFAST 96 / 120 Fanned Flue Combination Boiler

Covers: Xtrafast 120, Xtrafast 96

Thermistor values (Central heating, domestic hot water and storage vessel thermistors) NTC 10k

°C	0	5	10	15	20	25	30	35	40	45	50	55	60	65	70	75	80	85	90	95	100
Ω	32,565	25,345	19,875	15,700	12,500	10,000	8,060	6,535	5,330	4,370	3,605	2,989	2,490	2,085	1,755	1,480	1,260	1,070	920	785	680

From manual 115922 B 05/99, page 30.

Thermistor Resistance Values NTC 10k

°C	0	20	25	60	100
Ω	32,565	12,500	10,000	2,490	680

From manual 115922 B 05/99, page 29.

Xtrafast 96 120

Covers: Xtrafast 96 120

Thermistor values NTC 10k

°C	0	5	10	15	20	25	30	35	40	45	50	55	60	65	70	75	80	85	90	95	100
Ω	32,565	25,345	19,875	15,700	12,500	10,000	8,060	6,535	5,330	4,370	3,605	2,989	2,490	2,085	1,755	1,480	1,260	1,070	920	785	680

From manual 2000221595, page 26.

Ideal

BOXER combination boiler

Covers: Boxer C 24, Boxer C 28

CH and DHW sensor resistance NTC 10k

°C	0	5	10	15	20	25	30	35	40	45	50	55	60	65	70	75	80	85	90	95	100	105
Ω	33,242	25,633	19,947	15,659	12,394	9,888	7,947	6,433	5,242	4,300	3,548	2,945	2,459	2,063	1,740	1,475	1,256	1,075	923	797	690	600

From the installation and servicing manual, page 34.

Elise

Covers: Elise H15

Flow sensor resistance

Temperature (°C)	Resistance (Ω)
25	9700 - 10300
60	2400 - 2600
85	1000 - 1100

As printed in manual UIN 203949 A04, page 47.

ESPRIT 2

Covers: Esprit 2 24, Esprit 2 30, Esprit 2 35

NTC Sensor Resistance Table (Control Thermistor / Return Thermistor / DHW Thermistor / Dry Fire Thermistor)

Temperature	Expected Resistance
25 °C	9,700 - 10,300 Ohms
60 °C	2,400 - 2,600 Ohms
85 °C	1,000 - 1,100 Ohms

As printed in manual 206091, page 61.

NTC Sensor Resistance (Control, Return, DHW, and Dry Fire Thermistors)

Temperature (°C)	Resistance (Ohms)
25	9,700 - 10,300
60	2,400 - 2,600
85	1,000 - 1,100

As printed in manual 206091, page 61.

Esprit eco 24, 30

Covers: Esprit Eco 24, Esprit Eco 30

NTC Sensor Resistance (Flow and Return Thermistors)

Temperature	Expected Resistance (Ohms)
25 oC	9,700 - 10,300
60 oC	2,400 - 2,600
85 oC	1,000 - 1,100

As printed in manual 207493, page 53.

NTC Sensor Resistance Table (Flow/Return Thermistors)

Temperature	Resistance (Ohms)
25 °C	9,700 - 10,300
60 °C	2,400 - 2,600
85 °C	1,000 - 1,100

As printed in manual 207493, page 53.

ESPRIT ECO2 24 30 35

Covers: Esprit ECO2 24, Esprit ECO2 30

NTC Sensor Resistance Table (Flow / Return Thermistor)

Temperature	Resistance (Ohms)
25 oC	9,700 - 10,300
60 oC	2,400 - 2,600
85 oC	1,000 - 1,100

As printed in manual UIN 220218 A07, page 56.

NTC Thermistor Resistance (Flow / Return)

Temperature	Resistance (Ohms)
25 °C	9,700 - 10,300
60 °C	2,400 - 2,600
85 °C	1,000 - 1,100

As printed in manual UIN 220218 A07, page 56.

Europa 24

Covers: Europa 24, Europa 28

CH and DHW sensor resistance NTC 10k

°C	0	5	10	15	20	25	30	35	40	45	50	55	60	65	70	75	80	85	90	95	100	105
Ω	33,242	25,633	19,947	15,659	12,394	9,888	7,947	6,433	5,242	4,300	3,548	2,945	2,459	2,063	1,740	1,475	1,256	1,075	923	797	690	600

From manual 00331419, page 34.

excel HE

Covers: Excel HE C32

Thermistor and Sensor Resistance Values (Recuperator Thermistor / NTC sensors)

Temperature	Resistance
25 oC	Approx 10 K ohms
60 oC	Approx 3.2K ohms
95 oC	Approx 1.1K ohms

As printed in manual 201279, page 53.

i 24, i 30, i 35 combination boilers

Covers: Combi i 24, Combi i 35

NTC Sensor Resistance (Flow and Return Thermistors)

Temperature	Expected Resistance (Ohms)
25 oC	9,700 - 10,300
60 oC	2,400 - 2,600
85 oC	1,000 - 1,100

As printed in manual UIN 207496 A03, page 53.

NTC Sensor Resistance Table (Flow and Return Thermistors)

Temperature	Expected Resistance (Ohms)
25 °C	9,700 - 10,300
60 °C	2,400 - 2,600
85 °C	1,000 - 1,100

As printed in manual UIN 207496 A03, page 53.

i 24, i 30, i 35 combination boilers

Covers: I2 Combi 24, I2 Combi 35

Return sensor resistance

Temperature (°C)	Resistance (Ω)
25	9700 - 10300
60	2400 - 2600
85	1000 - 1100

As printed in manual UIN 220220 A05, page 56.

i-mini C24, C30

Covers: i-mini C30

NTC Thermistor Resistance (Return / Flow)

Temperature	Resistance (Ohms)
25 °C	9,700 - 10,300
60 °C	2,400 - 2,600
85 °C	1,000 - 1,100

As printed in manual UIN 222352, page 56.

i-mini2 C24 (Combi)

Covers: i-mini2 C24

Thermistor Resistance

Temperature (oC)	Resistance (kΩ)
25	9.7 – 10.3
60	2.4 – 2.6
85	1.0 – 1.1

As printed in manual 236471 A02, page 53.

icos - / User's (HE12, HE15, HE18, HE24)

Covers: HE15, HE24, Icos HE 12

Flow sensor resistance

Temperature (°C)	Resistance (Ω)
25	9700 - 10300
60	2400 - 2600
85	1000 - 1100

As printed in manual 200 212 A10, page 43.

Icos HE30, HE36

Covers: Icos HE36

Flow sensor resistance

Temperature (°C)	Resistance (Ω)
25	9700 - 10300
60	2400 - 2600
85	1000 - 1100

As printed in manual 202414, page 46.

icos m3080

Covers: Icos m3080

Flow sensor resistance

Temperature (°C)	Resistance (Ω)
25	9700 - 10300
60	2400 - 2600
85	1000 - 1100

As printed in the installation and servicing manual, page 39.

icos system

Covers: Icos System

Control Thermistor / Flue Thermistor Resistance Table

Temperature	Expected Resistance
25 °C	9,700 - 10,300 Ohms
60 °C	2,400 - 2,600 Ohms
85 °C	1,000 - 1,100 Ohms

As printed in the installation and servicing manual, page 47.

icos system (V3 Flue System)

Covers: Icos System HE 15, Icos System HE 24

Control sensor resistance

Temperature (°C)	Resistance (Ω)
25	9700 - 10300
60	2400 - 2600
85	1000 - 1100

As printed in manual UIN 203320 A05, page 56.

IDEAL CLASSIC 24 30 35

Covers: Classic 24

NTC Thermistor Resistance Table

Temperature	Expected Resistance
25 oC	9,700 - 10,300 Ohms
60 oC	2,400 - 2,600 Ohms
85 oC	1,000 - 1,100 Ohms

As printed in manual UIN 212135 A06, page 55.

IDEAL CLASSIC2 24 30 35

Covers: CLASSIC2 24, CLASSIC2 30

NTC Sensor Resistance (Flow and Return Thermistors)

Temperature	Resistance (Ohms)
25 °C	9,700 - 10,300
60 °C	2,400 - 2,600
85 °C	1,000 - 1,100

As printed in manual UIN 220219 A07, page 56.

NTC Sensor Resistance (Flow / Return Thermistors)

Temperature	Resistance (Ohms)
25 oC	9,700 - 10,300 Ohms
60 oC	2,400 - 2,600 Ohms
85 oC	1,000 - 1,100 Ohms

As printed in manual UIN 220219 A07, page 56.

Ideal Esprit HE

Covers: Esprit HE 30

NTC Sensor Resistance (Control, Return, DHW, and Dry Fire Thermistors)

Temperature (°C)	Expected Resistance (Ohms)
25	9,700 - 10,300
60	2,400 - 2,600
85	1,000 - 1,100

As printed in manual UIN 203642, page 62.

Ideal Exclusive 24 30 35

Covers: Exclusive 24

Flow Thermistor and Return Thermistor Resistance Table

Temperature (°C)	Resistance (Ohms)
25	9,700 - 10,300
60	2,400 - 2,600
85	1,000 - 1,100

As printed in manual UIN 217746 A03, page 56.

IDEAL EXCLUSIVE2 24 30 35

Covers: EXCLUSIVE2 30, EXCLUSIVE2 35

Thermistor Resistance Table (Flow / Return)

Temperature	Resistance (Ohms)
25 °C	9,700 - 10,300
60 °C	2,400 - 2,600
85 °C	1,000 - 1,100

As printed in manual UIN 220221 A07, page 56.

Thermistor Resistance Table

Temperature	Expected Resistance
25 oC	9,700 - 10,300 Ohms
60 oC	2,400 - 2,600 Ohms
85 oC	1,000 - 1,100 Ohms

As printed in manual UIN 220221 A07, page 56.

Ideal GB24 & GB30 Series III Combination Boiler

Covers: GB24 / GB30

NTC Sensor Resistance Table (Flow/Return)

Temperature (C)	Resistance (Ohms)
25	9,700 - 10,300
60	2,400 - 2,600
85	1,000 - 1,100

As printed in manual UIN 220217 A04, page 34.

Ideal INSTINCT

Covers: Instinct 24

NTC Thermistor Resistance Table

Temperature	Expected Resistance
25 °C	9,700 - 10,300 Ohms
60 °C	2,400 - 2,600 Ohms
85 °C	1,000 - 1,100 Ohms

As printed in manual UIN 212456 A03, page 55.

Ideal Logic Code Combi 26, 33, 38

Covers: Logic Code Combi 33

NTC Sensor Resistance (Flow, Return & No Flow Thermistors)

Temperature	Resistance (Ohms)
25 oC	9,700 - 10,300
60 oC	2,400 - 2,600
85 oC	1,000 - 1,100

As printed in manual 206279, page 55.

Ideal Logic Combi 24, 30, 35

Covers: Logic Combi 30

NTC Thermistor resistance table

Temperature	Resistance (Ohms)
25 oC	9,700 - 10,300
60 oC	2,400 - 2,600
85 oC	1,000 - 1,100

As printed in manual UIN 204626 A12, page 51.

Ideal Logic System

Covers: Logic System 18

NTC Sensor Resistance Table (Control/No Flow Thermistor & Return Thermistor)

Temperature	Resistance
25 oC	9,700 - 10,300 Ohms
60 oC	2,400 - 2,600 Ohms
85 oC	1,000 - 1,100 Ohms

As printed in manual 205552, page 51.

Ideal Logic+ System 15 18 24 30

Covers: Logic + System 15, Logic + System 18, Logic + System 24, Logic + System 30

NTC Thermistor Resistance Table (Control / No Flow & Return Thermistors)

Temperature	Expected Resistance (Ohms)
25 oC	9,700 - 10,300 Ohms
60 oC	2,400 - 2,600 Ohms
85 oC	1,000 - 1,100 Ohms

As printed in manual UIN 206025 A06, page 51.

NTC sensor resistance table (Control / No Flow & Return Thermistor)

Temperature	Expected Resistance (Ohms)
25 oC	9,700 - 10,300
60 oC	2,400 - 2,600
85 oC	1,000 - 1,100

As printed in manual UIN 206025 A06, page 51.

INDEPENDENT + COMBI 24 30 35

Covers: INDEPENDENT + Combi 30

Thermistor Resistance (Flow and Return)

Temperature	Resistance (Ohms)
25 oC	9,700 - 10,300
60 oC	2,400 - 2,600
85 oC	1,000 - 1,100

As printed in manual UIN 215343 A06, page 57.

Independent + Combi C24, C30, C35

Covers: Independent + C24

NTC Sensor Resistance Table (Thermistor)

Temperature (°C)	Resistance (Ohms)
25 °C	9,700 - 10,300
60 °C	2,400 - 2,600
85 °C	1,000 - 1,100

As printed in manual 207607, page 50.

INDEPENDENT COMBI 24 30 35

Covers: Independent Combi 24

Return sensor resistance

Temperature (°C)	Resistance (Ω)
25	9700 - 10300
60	2400 - 2600
85	1000 - 1100

As printed in manual UIN 215344 A06, page 57.

INDEPENDENT COMBI 24 30 35

Covers: INDEPENDENT Combi 30

NTC Thermistor Resistance Table (Flow & Return Thermistors)

Temperature (°C)	Resistance (Ohms)
25	9,700 - 10,300
60	2,400 - 2,600
85	1,000 - 1,100

As printed in manual UIN 215344 A06, page 57.

INDEPENDENT COMBI2 C24 C30 C35

Covers: Independent COMBI2 C24, INDEPENDENT COMBI2 C35

NTC Thermistor Resistance Table (Flow / Return / DHW)

Temperature (°C)	Resistance (kΩ)
25	9.7 – 10.3
60	2.4 – 2.6
85	1.0 – 1.1

As printed in manual UIN 236469 A02, page 53.

INDEPENDENT SYSTEM s15 s18 s24 s30

Covers: INDEPENDENT System S18, INDEPENDENT System s24, INDEPENDENT System s30

NTC Thermistor resistance (Control / No Flow & Return Thermistors)

Temperature (°C)	Resistance (Ohms)
25	9,700 - 10,300
60	2,400 - 2,600
85	1,000 - 1,100

As printed in manual UIN 215351 A04, page 57.

NTC Sensor Resistance Table (Control / No Flow & Return Thermistors)

Temperature	Resistance (Ohms)
25 oC	9,700 - 10,300
60 oC	2,400 - 2,600
85 oC	1,000 - 1,100

As printed in manual UIN 215351 A04, page 57.

INDEPENDENT SYSTEM2 S15 S18 S24 S30

Covers: Independent System2 S15, Independent SYSTEM2 S18, Independent SYSTEM2 S30

NTC Sensor Resistance Table (Flow and Return Thermistors)

Temperature oC	Resistance kΩ
25	9.7 – 10.3
60	2.4 – 2.6
85	1.0 – 1.1

As printed in manual 236470, page 49.

isar + programmer

Covers: HE24+P, HE30+P, HE35+P

NTC Sensor Resistance Table (Control, Return, DHW, Dry Fire Thermistors)

Temperature	Resistance (Ohms)
25 oC	9,700 - 10,300
60 oC	2,400 - 2,600
85 oC	1,000 - 1,100

As printed in manual 203321, page 58.

NTC Sensor Resistance Table (Control Thermistor Flow/Return, Return Thermistor, DHW Thermistor, Dry Fire Thermistor)

Temperature	Expected Resistance
25 °C	9,700 - 10,300 Ohms
60 °C	2,400 - 2,600 Ohms
85 °C	1,000 - 1,100 Ohms

As printed in manual 203321, page 58.

NTC Sensor Resistance Table (Flow, Return, DHW, and Dry Fire Thermistors)

Temperature (°C)	Resistance (Ohms)
25	9,700 - 10,300
60	2,400 - 2,600
85	1,000 - 1,100

As printed in manual 203321, page 58.

isar combination condensing

Covers: Isar M30 / M100

CONTROL sensor resistance

Temperature (°C)	Resistance (Ω)
25	9700 - 10300
60	2400 - 2600
85	1000 - 1100

As printed in manual 156 412 A04, page 49.

Isar HE24 (V3 Flue System)

Covers: Isar HE24, Isar HE35

Control thermistor [flow] sensor resistance

Temperature (°C)	Resistance (Ω)
25	9700 - 10300
60	2400 - 2600
85	1000 - 1100

As printed in manual 203319, page 58.

Logic + Combi 24, 30, 35

Covers: Logic+ Combi 30, Logic+ Combi 35

NTC Thermistor resistances

Temperature	Resistance
25 oC	9,700 - 10,300 Ohms
60 oC	2,400 - 2,600 Ohms
85 oC	1,000 - 1,100 Ohms

As printed in manual 204978, page 58.

NTC Thermistor resistance (Flow/Return and No Water Flow Thermistors)

Temperature (°C)	Resistance (Ohms)
25	9,700 - 10,300
60	2,400 - 2,600
85	1,000 - 1,100

As printed in manual 204978, page 58.

Outside Sensor resistance

Temperature (°C)	Resistance (Ohms)
0	31,000 - 35,000
15	15,000 - 16,500
30	7,700 - 8,500

As printed in manual 204978, page 61.

Logic + Heat 12, 15, 18, 24, 30

Covers: Logic + Heat 15, Logic + Heat 24, Logic + Heat 30

NTC Sensor Resistance (Flow/Return Thermistor)

Temperature	Resistance (Ohms)
25 oC	9,700 - 10,300
60 oC	2,400 - 2,600
85 oC	1,000 - 1,100

As printed in manual 206064, page 52.

NTC Sensor Resistance (Flow and Return Thermistors)

Temperature (°C)	Expected Resistance (Ohms)
25	9,700 - 10,300
60	2,400 - 2,600
85	1,000 - 1,100

As printed in manual 206064, page 52.

NTC Thermistor Resistance Table

Temperature	Resistance (Ohms)
25 °C	9,700 - 10,300
60 °C	2,400 - 2,600
85 °C	1,000 - 1,100

As printed in manual 206064, page 52.

Logic Code Combi ES26 ES33 ES38

Covers: Logic Code Combi ES26, Logic Code Combi ES33, Logic Code Combi ES38

NTC Sensor Resistance Table (Flow and Return Thermistors)

Temperature (°C)	Resistance (Ohms)
25	9,700 - 10,300
60	2,400 - 2,600
85	1,000 - 1,100

As printed in manual 210927, page 57.

Flow and Return Thermistor Resistance Table

Temperature	Resistance (Ohms)
25 oC	9,700 - 10,300
60 oC	2,400 - 2,600
85 oC	1,000 - 1,100

As printed in manual 210927, page 57.

NTC Sensor Resistance Table (Flow / Return Thermistor)

Temperature	Expected Resistance
25 oC	9,700 - 10,300 Ohms
60 oC	2,400 - 2,600 Ohms
85 oC	1,000 - 1,100 Ohms

As printed in manual 210927, page 57.

LOGIC CODE COMBI ESP1 26 33 38

Covers: Logic Code Combi ESP1 26, Logic Code Combi ESP1 38

NTC Thermistor Resistance Table

Temperature (°C)	Resistance (Ohms)
25	9,700 - 10,300
60	2,400 - 2,600
85	1,000 - 1,100

As printed in manual 222364 A04, page 57.

Logic Combi C24 C30 C35

Covers: Logic Combi C35

NTC Sensor Resistance Table (Flow and Return Thermistors)

Temperature (°C)	Resistance (Ohms)
25	9,700 - 10,300
60	2,400 - 2,600
85	1,000 - 1,100

As printed in manual UIN 213972 A09, page 56.

Logic Combi ESP ESP24 ESP30 ESP35

Covers: Logic Combi ESP35

Return sensor resistance

Temperature (°C)	Resistance (Ω)
25	9700 - 10300
60	2400 - 2600
85	1000 - 1100

As printed in manual 213936, page 55.

Logic Combi ESP1 24 30 35

Covers: Logic Combi ESP1 30, Logic Combi ESP1 35

Thermistor Resistance Table

Temperature	Resistance (Ohms)
25 °C	9,700 - 10,300
60 °C	2,400 - 2,600
85 °C	1,000 - 1,100

As printed in manual UIN 222353 A04, page 56.

Logic Combi2 C24 C30 C35

Covers: Logic COMBI2 C24, Logic COMBI2 C30

NTC Thermistor Resistance Table

Temperature (oC)	Resistance (kΩ)
25	9.7 – 10.3
60	2.4 – 2.6
85	1.0 – 1.1

As printed in manual UIN 228296 A05, page 54.

LOGIC Heat 12, 15, 18, 24, 30

Covers: Logic Heat 12, Logic Heat 15, Logic Heat 18, Logic Heat 24

Flow/Return NTC Sensor Resistance Table

Temperature	Expected Resistance (Ohms)
25 oC	9,700 - 10,300 Ohms
60 oC	2,400 - 2,600 Ohms
85 oC	1,000 - 1,100 Ohms

As printed in manual 205862, page 52.

Flow Thermistor Resistance

Temperature	Resistance (Ohms)
25 oC	9,700 - 10,300
60 oC	2,400 - 2,600
85 oC	1,000 - 1,100

As printed in manual 205862, page 52.

NTC Flow/Return Thermistor Resistance Table

Temperature	Expected Resistance
25 ºC	9,700 - 10,300 Ohms
60 ºC	2,400 - 2,600 Ohms
85 ºC	1,000 - 1,100 Ohms

As printed in manual 205862, page 52.

Flow Thermistor Resistance

Temperature (°C)	Expected Resistance (Ohms)
25	9,700 - 10,300
60	2,400 - 2,600
85	1,000 - 1,100

As printed in manual 205862, page 52.

Logic Heat H

Covers: Logic Heat H18, Logic Heat H30

NTC Sensor Resistance Table (Control / Return / Thermistors)

Temperature	Expected Resistance
25 ºC	9,700 - 10,300 Ohms
60 ºC	2,400 - 2,600 Ohms
85 ºC	1,000 - 1,100 Ohms

As printed in manual UIN 215354 A07, page 57.

NTC Thermistor Resistance Table

Temperature	Resistance (Ohms)
25 ºC	9,700 - 10,300
60 ºC	2,400 - 2,600
85 ºC	1,000 - 1,100

As printed in manual UIN 215354 A07, page 57.

Logic HEAT2 H

Covers: Logic HEAT2 H12, Logic HEAT2 H15, Logic HEAT2 H18, Logic HEAT2 H24

NTC Sensor Resistance Table (Flow / Return / Thermistors)

Temperature °C	Resistance kΩ
25	9.7 – 10.3
60	2.4 – 2.6
85	1.0 – 1.1

As printed in manual 228298 A04, page 49.

NTC Sensor Resistance Table (Flow/Return Thermistors)

Temperature	Resistance kΩ
25 °C	9.7 – 10.3
60 °C	2.4 – 2.6
85 °C	1.0 – 1.1

As printed in manual 228298 A04, page 49.

Outside Sensor Resistance Table

Temperature	Resistance kΩ
0 °C	31.0 – 35.0
15 °C	15.0 – 16.5
30 °C	7.7 – 8.5

As printed in manual 228298 A04, page 52.

LOGIC MAX COMBI2 C24 C30 C35

Covers: Logic Max COMBI2 C24, Logic Max COMBI2 C30, Logic Max COMBI2 C35

Flow and Return sensor resistance

Temperature (°C)	Resistance (Ω)
25	10300
60	2600
85	1100

As printed in manual 237660, page 55.

Logic Max Heat H 12 15 18 24 30

Covers: Logic Max Heat H12, Logic Max Heat H15, Logic Max Heat H18

NTC Sensor Resistance Table (Control / Return Thermistor)

Temperature	Resistance
25 oC	9,700 - 10,300 Ohms
60 oC	2,400 - 2,600 Ohms
85 oC	1,000 - 1,100 Ohms

As printed in manual UIN 219010 A04, page 58.

NTC Thermistor Resistance Table

Temperature (°C)	Resistance (Ohms)
25	9,700 - 10,300
60	2,400 - 2,600
85	1,000 - 1,100

As printed in manual UIN 219010 A04, page 58.

Logic Max Heat2 H12 H15 H18 H24 H30

Covers: Logic Max HEAT2 H12, Logic Max HEAT2 H30

Thermistor Resistance Table

Temperature oC	Resistance kΩ
25	9.7 – 10.3
60	2.4 – 2.6
85	1.0 – 1.1

As printed in manual UIN 228292 A09, page 54.

NTC Sensor Resistance Table (Flow / Return Thermistors)

Temperature	Resistance kΩ
25 °C	9.7 – 10.3
60 °C	2.4 – 2.6
85 °C	1.0 – 1.1

As printed in manual UIN 228292 A09, page 54.

LOGIC MAX SYSTEM2 S15 S18 S24 S30

Covers: Logic Max SYSTEM2 S15, Logic Max SYSTEM2 S18, Logic Max SYSTEM2 S24, Logic Max SYSTEM2 S30

Flow and Return sensor resistance

Temperature (°C)	Resistance (Ω)
25	10300
60	2600
85	1100

As printed in manual 237661, page 51.

Logic System s15 s18 s24 s30

Covers: Logic System S18, Logic System s30

NTC Sensor Resistance (Control / No Flow & Return Thermistors)

Temperature	Resistance
25 ºC	9,700 - 10,300 Ohms
60 ºC	2,400 - 2,600 Ohms
85 ºC	1,000 - 1,100 Ohms

As printed in manual 215349, page 57.

NTC Sensor Resistance Table (Control / No Flow & Return Thermistors)

Temperature (°C)	Resistance (Ohms)
25	9,700 - 10,300
60	2,400 - 2,600
85	1,000 - 1,100

As printed in manual 215349, page 57.

Logic System2 S15

Covers: Logic SYSTEM2 S15, Logic SYSTEM2 S18, Logic SYSTEM2 S24, Logic SYSTEM2 S30

NTC Sensor Resistance Table (Flow / Return Thermistors)

Temperature	Resistance kΩ
25 oC	9.7 – 10.3
60 oC	2.4 – 2.6
85 oC	1.0 – 1.1

As printed in manual UIN 228297 A05, page 49.

LOGIC+ COMBI C 24 30 35

Covers: Logic + Combi C24, Logic + Combi C30, Logic + Combi C35

NTC Sensor Resistance (Flow / Return Thermistor)

Temperature (°C)	Resistance (Ohms)
25	9,700 - 10,300
60	2,400 - 2,600
85	1,000 - 1,100

As printed in manual UIN 215346 A01, page 61.

NTC Sensor Resistance (Flow and Return Thermistors)

Temperature	Resistance (Ohms)
25°C	9,700 - 10,300
60°C	2,400 - 2,600
85°C	1,000 - 1,100

As printed in manual UIN 215346 A01, page 61.

NTC Sensor Resistance (Flow and Return Thermistors)

Temperature	Resistance
25 oC	9,700 - 10,300 Ohms
60 oC	2,400 - 2,600 Ohms
85 oC	1,000 - 1,100 Ohms

As printed in manual UIN 215346 A01, page 61.

Logic+ Combi2 C24 C30 C35

Covers: Logic+ COMBI2 C24, Logic+ COMBI2 C30, Logic+ COMBI2 C35

Flow and Return sensor resistance

Temperature (°C)	Resistance (Ω)
25	10300
60	2600
85	1100

As printed in manual UIN 237662 A05, page 57.

Logic+ Heat H12 H15 H18 H24 H30

Covers: Logic+ Heat H15, Logic+ Heat H30

NTC Sensor Resistance Table

Temperature (ºC)	Resistance (Ohms)
25	9,700 - 10,300
60	2,400 - 2,600
85	1,000 - 1,100

As printed in manual UIN 215355 A10, page 57.

NTC Sensor Resistance Table (Control / Return Thermistors)

Temperature	Resistance (Ohms)
25 ºC	9,700 - 10,300
60 ºC	2,400 - 2,600
85 ºC	1,000 - 1,100

As printed in manual UIN 215355 A10, page 57.

Logic+ HEAT2 H12 H15 H18 H24 H30

Covers: Logic+ HEAT2 H24

NTC Sensor Resistance Table (Flow & Return Thermistors)

Temperature (°C)	Resistance (kΩ)
25	9.7 – 10.3
60	2.4 – 2.6
85	1.0 – 1.1

As printed in manual UIN 228295 A08, page 54.

Logic+ System s15 s18 s24 s30

Covers: Logic+ System s30

NTC Thermistor Resistance (Control / No Flow / Return Thermistor)

Temperature	Resistance
25 oC	9,700 - 10,300 Ohms
60 oC	2,400 - 2,600 Ohms
85 oC	1,000 - 1,100 Ohms

As printed in manual 215353, page 57.

Outside Sensor Resistance

Temperature	Resistance
0 oC	31,000 - 35,000 Ohms
15 oC	15,000 - 16,500 Ohms
30 oC	7,700 - 8,500 Ohms

As printed in manual 215353, page 57.

LOGIC+ SYSTEM2 S15 S18 S24 S30

Covers: Logic+ SYSTEM2 S18, Logic+ SYSTEM2 S30

NTC Thermistor Resistance Table

Temperature (°C)	Resistance (kΩ)
25	9.7 – 10.3
60	2.4 – 2.6
85	1.0 – 1.1

As printed in manual 237663, page 51.

Thermistor Resistance Table (Flow & Return Thermistors)

Temperature (°C)	Resistance (kΩ)
25°C	9.7 – 10.3
60°C	2.4 – 2.6
85°C	1.0 – 1.1

As printed in manual 237663, page 51.

Vogue C32

Covers: Vogue C32, Vogue c40

NTC Thermistor Resistance (Flow and Return / Outside Sensor)

Temperature (°C)	Resistance (Ω)
25	9,700 - 10,300
60	2,400 - 2,600
85	1,000 - 1,100

As printed in manual 208548, page 63.

Vogue Max Combi 26 32 40

Covers: Vogue Max Combi 26, Vogue Max Combi 32

NTC Thermistor Resistance Table

Temperature (ºC)	Resistance (Ω)
25	9,700 - 10,300
60	2,400 - 2,600
85	1,000 - 1,100

As printed in manual 222378 A08, page 70.

Thermistor Resistance (Flow & Return)

Temperature	Resistance
25°C	9,700 - 10,300 Ω
60°C	2,400 - 2,600 Ω
85°C	1,000 - 1,100 Ω

As printed in manual 222378 A08, page 70.

Vogue Max System 15

Covers: Vogue Max System 15, Vogue Max System 18, Vogue Max System 26, Vogue Max System 32

Return sensor resistance

Temperature (°C)	Resistance (Ω)
25	9700 - 10300
60	2400 - 2600
85	1000 - 1100

As printed in manual 219005, page 65.

Vogue System Boiler S15, S18, S26, S32

Covers: Vogue S15, Vogue s26, Vogue s32

NTC Thermistor Resistance Table

Temperature	Resistance
25°C	9,700 - 10,300 Ω
60°C	2,400 - 2,600 Ω
85°C	1,000 - 1,100 Ω

As printed in manual 208549 A04, page 61.

NTC Sensor Resistance Table (Flow/Return/Outside Sensor)

Temperature	Expected Resistance
25ºC	9,700 - 10,300 Ω
60ºC	2,400 - 2,600 Ω
85ºC	1,000 - 1,100 Ω

As printed in manual 208549 A04, page 61.

Vogue System Gen2 (S15, S18, S26, S32)

Covers: Vogue S15P Gen2 System, Vogue S18 Gen2 System

Flow sensor resistance

Temperature (°C)	Resistance (Ω)
25	9700 - 10300
60	2400 - 2600
85	1000 - 1100

As printed in manual 216172, page 64.

Outside sensor resistance

Temperature (°C)	Resistance (Ω)
0	31000 - 35300
15	15000 - 16500
30	7700 - 8500

As printed in manual 216172, page 64.

Intergas

Combi Compact ECO RF - Installation, service and

Covers: Combi Compact ECO RF

NTC Sensor Resistance (12k Ohm) NTC 12k

°C	25	50	80	100
Ω	12,000	4,609	1,707	952

From the installation and servicing manual, page 50.

Combi Compact HRE

Covers: Combi Compact HRE 24/18, Combi Compact HRE 28/24

NTC Sensor Resistance (12k Ohm) NTC 12k

°C	-15	0	25	50	100
Ω	76,020	36,130	12,000	4,609	952

From manual 882877-15, page 47.

NTC Sensor Resistance Table (12k Ohm) NTC 12k

°C	20	25	30	80
Ω	14,770	12,000	9,805	1,707

From manual 882877-15, page 47.

Compact HRE SB Installation, service and

Covers: Compact HRE OV

NTC Resistances (12kOhm) NTC 12k

°C	10	20	25	30	80
Ω	22,800	14,770	12,000	9,805	1,707

From manual 88322802, page 50.

Intergas Compact HRE SB Installation, service and

Covers: Combi Compact HRE SB

NTC résistances (NTC 12kOhm) NTC 12k

°C	-15	-10	-5	0	5	10	15	20
Ω	76,020	58,880	45,950	36,130	28,600	22,800	18,300	14,770

From the installation and servicing manual, page 54.

Intergas Xclusive

Covers: Xclusive, Xclusive 24

NTC Resistances (12 kOhm) NTC 12k

°C	-15	-10	5	15	25	50	75	100
Ω	76,020	58,880	28,600	18,300	12,000	4,609	1,994	952

From manual 84010402, page 74.

NTC Sensor Resistance

Temp (°C)	Resistance (Ohm)
25	12000
50	4609
80	1717

As printed in manual 84010402, page 74.

Rapid 25 / Rapid 32

Covers: Rapid 25, Rapid 32

NTC resistances (12 kOhm) NTC 12k

°C	-15	-10	-5	0	5	35	40	45	50	55
Ω	76,020	58,880	45,950	36,130	28,600	8,055	6,653	5,522	4,609	3,863

From the installation and servicing manual, page 62.

NTC resistances (12 kOhm) NTC 12k

°C	-15	-10	-5	0	5
Ω	76,020	58,880	45,950	36,130	28,600

From the installation and servicing manual, page 62.

Rapid 25 32

Covers: Rapid 25 32

NTC Resistance Table (12 kOhm) NTC 12k

°C	10	20	25	30	40	50	60	70	80
Ω	22,800	14,770	12,000	9,805	6,653	4,609	3,253	2,337	1,707

From manual 88923801, page 52.

Xtreme

Covers: Xtreme 30, Xtreme 36

NTC resistances (NTC 12 kOhm) NTC 12k

°C	-15	-10	-5	0	5	10
Ω	76,020	58,880	45,950	36,130	28,600	22,800

From manual 84007407, page 74.

Keston

Keston Combi2 C30 / C35

Covers: Combi2 C30

Flow and Return sensor resistance

Temperature (°C)	Resistance (Ω)
25	10300
60	2600
85	1100

As printed in manual UIN 236467 A03, page 56.

Main

Combi Eco Range

Covers: Combi 25 Eco, Combi 30 Eco

Cold resistance approximately (DHW and CH sensors): 10kΩ @ 25° C (page 54)
Cold resistance approximately (Flue sensor): 20kΩ @ 25° C (page 54)
DHW and CH sensors: 10kΩ @ 25°C (page 54)
Flue sensor: 20kΩ @ 25°C (page 54)

Main Eco Elite Combi 25 - 30

Covers: Eco Elite 30 Combi ErP

Cold resistance approximately: 10k ohm @ 25°C (DHW and CH sensors) (page 50)

Main Eco Elite System ErP

Covers: Eco Elite 24 System ErP, Eco Elite 28 System ErP

Cold resistance approximately: 10k Ω @ 25° C (Temperature sensors) (page 46)
Cold resistance (Temperature sensors): approximately 10k Ω @ 25° C (page 46)
Cold resistance (Flue sensor): approximately 20k Ω @ 25° C (page 46)

System Eco

Covers: System 24 Eco, System 28 Eco

Cold resistance: approx 10kΩ at 25°C (page 51)
Temperature Sensors (Cold resistance): approximately 10kΩ @ 25° C (page 51)
Flue Sensor (Cold resistance): approximately 20kΩ @ 25° C (page 51)

Potterton

Gold Combi HE Range

Covers: Gold HE

CH Sensor: 10kΩ @ 25°C (page 50)
DHW Sensor: 10kΩ @ 25°C (page 50)
Flue Sensor: 20kΩ @ 25°C (page 50)

Heatmax Combi HE Range Condensing Combination Boiler

Covers: Heatmax Combi 28 HE, Heatmax Combi 33 HE

CH and DHW sensors (Cold resistance): 10kΩ @ 25° C (page 56)
Flue sensor (Cold resistance): 20kΩ @ 25° C (page 56)
CH and DHW sensors: 10kΩ @ 25° C (resistance reduces with increase in temp.) (page 56)
Flue sensor: 20kΩ @ 25° C (resistance reduces with increase in temp.) (page 56)

Potterton Apollo Condensing Combination Boiler

Covers: Apollo 25, Apollo 30

Cold resistance CH and DHW sensors: approximately 10kΩ @ 25° C (page 55)
Cold resistance Flue sensor: 20kΩ @ 25° C (page 55)
CH and DHW sensors (cold resistance): approximately 10kΩ @ 25° C (page 55)
Flue sensor (cold resistance): approximately 20kΩ @ 25° C (page 55)

Potterton Assure Combi

Covers: Assure 25 Combi, Assure 30 Combi, Assure 36 Combi

Cold resistance (DHW and CH sensors): approximately 10kΩ @ 25° C (page 69)
Cold resistance (Flue sensor): approximately 20kΩ @ 25° C (page 69)
Resistance (approx): 10kΩ @ 25°C (CH/DHW) (page 69)
CH sensors: 10k Ω @ 25° C (resistance reduces with increase in temp.) (page 69)
DHW sensors: 10k Ω @ 25° C (resistance reduces with increase in temp.) (page 69)
Flue sensor: 20k Ω @ 25° C (resistance reduces with increase in temp.) (page 69)

Potterton Gold 18 - 24 - 28 System ErP Condensing System Boiler

Covers: Gold 18 System ErP, Gold 28 System ErP

Cold resistance (DHW and CH sensors): 10k Ω @ 25° C (page 46)
Cold resistance (Flue sensor): 20k Ω @ 25° C (page 46)
Cold resistance (DH and CH sensors): 10k Ω @ 25°C (page 46)
Flue sensor: 20k Ω @ 25°C (page 46)

Potterton Gold Combi 24 - 28 - 33 / 28 LPG

Covers: Gold 28 Combi ErP

DHW and CH sensors (cold resistance): approximately 10kΩ @ 25° C (page 52)
Flue sensor (cold resistance): approximately 20kΩ @ 25° C (page 52)

Potterton Gold Combi 24, 28 & 33 HE

Covers: Gold Combi HE

DHW and CH sensors (cold resistance approx): 10kΩ @ 25° C (page 56)
Flue sensor (cold resistance approx): 20kΩ @ 25° C (page 56)

Potterton Promax 24 - 28 - 33 Combi ErP

Covers: Promax 24 Combi ErP, Promax 28 Combi ErP

DHW and CH sensors: Cold resistance approximately 10k Ω @ 25°C (page 51)
Flue sensor: Cold resistance approximately 20k Ω @ 25°C (page 51)
CH and DHW sensors: Cold resistance approximately 10k Ω @ 25°C (resistance reduces with increase in temp.) (page 51)

Potterton Promax Combi 24, 28 & 33 HE Plus

Covers: Promax Combi 33 HE Plus

DHW and CH sensors: Approximately 10kΩ @ 25° C (page 54)
Flue sensor: Approximately 20kΩ @ 25° C (page 54)

Potterton Promax System ErP

Covers: Promax 12 System ErP, Promax 15 System ErP, Promax 18 System ErP, Promax 24 System ErP, Promax 32 System ErP

Cold resistance (DHW and CH sensors): approximately 10k Ω @ 25° C (page 48)
Cold resistance (Flue sensor): approximately 20k Ω @ 25° C (page 48)
DHW and CH sensors: Approximately 10k Ω @ 25°C (page 48)
Flue sensor: Approximately 20k Ω @ 25°C (page 48)
Cold resistance approximately (DHW and CH sensors): 10k Ω @ 25° C (page 48)
Cold resistance approximately (Flue sensor): 20k Ω @ 25° C (page 48)
CH and DHW sensors: 10k ohm @ 25°C (resistance reduces with increase in temp.) (page 48)

Potterton Promax Ultra Combi 24 - 28 - 33 - 40

Covers: Promax Ultra Combi 24 ErP, Promax Ultra Combi 28 ErP, Promax Ultra Combi 33 ErP, Promax Ultra Combi 40 ErP

DHW and CH sensors: Cold resistance approximately 10kΩ @ 25° C (resistance reduces with increase in temp.) (page 52)
Flue sensor: Cold resistance approximately 20kΩ @ 25° C (resistance reduces with increase in temp.) (page 52)
DHW and CH sensors (cold resistance approx.): 10kΩ @ 25°C (resistance reduces with increase in temp.) (page 52)
Flue sensor (cold resistance approx.): 20kΩ @ 25°C (resistance reduces with increase in temp.) (page 52)
CH and DHW sensors: approximately 10kΩ @ 25° C (resistance reduces with increase in temp.) (page 52)

Potterton Titanium Combi ErP 24 - 28 - 33 - 40

Covers: Titanium 28 Combi ErP, Titanium 33 Combi ErP

DHW and CH sensors: 10k ohm @ 25°C (resistance reduces with increase in temp.) (page 53)
Flue sensor: 20k ohm @ 25°C (resistance reduces with increase in temp.) (page 53)
Cold resistance CH and DHW sensors: Approximately 10k Ω @ 25°C (page 53)
Cold resistance Flue sensor: Approximately 20k Ω @ 25°C (page 53)

Potterton Ultra System 12 - 15 - 18 - 24 - 28 Condensing System Boiler

Covers: Ultra 24 System

CH and DHW sensors: Approximately 10kΩ @ 25°C (resistance reduces with increase in temp.) (page 47)
Flue sensor: Approximately 20kΩ @ 25°C (resistance reduces with increase in temp.) (page 47)

Promax HE Store Range

Covers: Promax HE Store 90 Litre

Cold resistance (DHW and CH sensors): approximately 10kΩ @ 25° C (page 57)
Cold resistance (Flue sensor): 20kΩ @ 25° C (page 57)

Promax System HE Plus Range

Covers: Promax System 12 HE Plus, Promax System 15 HE Plus, Promax System 18 HE Plus, Promax System 24 HE Plus

Cold resistance approximately (DHW and CH sensors): 10kΩ @ 25° C (page 50)
Cold resistance approximately (Flue sensor): 20kΩ @ 25° C (page 50)
DHW and CH sensors: Approximately 10kΩ @ 25°C (resistance reduces with increase in temp.) (page 50)
Flue sensor: Approximately 20kΩ @ 25°C (resistance reduces with increase in temp.) (page 50)
DHW and CH sensors (Cold resistance): approximately 10kΩ @ 25°C (page 51)
Flue sensor (Cold resistance): approximately 20kΩ @ 25°C (page 51)
Cold resistance (DH and CH sensors): approximately 10kΩ @ 25° C (page 51)
Cold resistance (Flue sensor): approximately 20kΩ @ 25° C (page 51)

Pro

Procombi Exclusive

Covers: ProCombi Exclusive 35

NTC Sensor Resistance Table (Flow and Return Thermistors)

Temperature	Expected Resistance (Ohms)
25 oC	9,700 - 10,300
60 oC	2,400 - 2,600
85 oC	1,000 - 1,100

As printed in manual UIN 207494 A03, page 53.

Saunier Duval

Enviroplus (Combi / System)

Covers: Enviroplus

C.H. Thermistor: 10K Ω @ 25°C (page 48)

ISOMAX

Covers: Isomax F30E

Thermistor values NTC 10k

°C	0	20	25	60	80	100
Ω	32,565	12,500	10,000	2,490	1,260	680

From manual 116277 B 07/00, page 30.

Sime

BRAVA DGT HE 25 - 30 - 35

Covers: Brava DGT HE 35

TABLE 4 (SM - SF sensors) - NTC sensor resistance NTC 10k

°C	20	30	40	50	60	70	80
Ω	12,090	8,313	5,828	4,161	3,021	2,229	1,669

From manual 6316191, page 21.

BRAVA ONE HE

Covers: Brava One HE

NTC R25°C; 10kΩ B25°-85°C: 3435 sensor resistance NTC 10k

°C	0	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31	32	33	34	35	36	37	38	39	40	41	42	43	44	45	46	47	48	49	50	51	52	53	54	55	56	57	58	59	60	61	62	63	64	65	66	67	68	69	70	71	72	73	74	75	76	77	78	79	80	81	82	83	84	85	86	87	88	89	90	91	92	93	94	95	96	97	100
Ω	27,279	26,135	25,044	24,004	23,014	22,069	21,168	20,309	19,489	18,706	17,959	17,245	16,563	15,912	15,289	14,694	14,126	13,582	13,062	12,565	12,090	11,634	11,199	10,781	10,382	9,999	9,633	9,281	8,945	8,622	8,313	8,016	7,731	7,458	7,196	6,944	6,702	6,470	6,247	6,033	5,828	5,630	5,440	5,258	5,082	4,913	4,751	4,595	4,444	4,300	4,161	4,026	3,897	3,773	3,653	3,538	3,426	3,319	3,216	3,116	3,021	2,928	2,839	2,753	2,669	2,589	2,512	2,437	2,365	2,296	2,229	2,164	2,101	2,040	1,982	1,925	1,870	1,817	1,766	1,717	1,669	1,622	1,577	1,534	1,491	1,451	1,411	1,373	1,336	1,300	1,266	1,232	1,199	1,168	1,137	1,108	1,079	1,051	973

From manual 6322790B, page 7.

Brava Slim HE R

Covers: Brava Slim HE Regular

Temperature Detected/Resistance (NTC)

TR	Resistance R (Ω)
75°C	1925Ω
80°C	1669Ω

As printed in manual 6322891A, page 18.

Combination Boilers : Sime “FRIENDLY” and “FRIENDLY E”

Covers: Friendly

NTC sensor resistance table NTC 10k

°C	20	30	35	40	45	50	55	60	70	80
Ω	12,000	8,300	6,900	5,800	4,900	4,100	3,500	3,000	2,200	1,700

From manual Cod. 6233230A, page 32.

ECOMFORT PLUS HE-EV

Covers: Ecomfort Plus 25 HE-EV Combi, Ecomfort System Plus HE EV

Heating Sensor (SM1/SM2) Temperature / Electrical Resistance NTC 10k

°C	20	30	40	50	60	70	80
Ω	12,090	8,313	5,828	4,161	3,021	2,229	1,669

From manual 199838, page 23.

FORMAT DGT HE

Covers: Format DGT HE 30 Combi

SM - SF - SB sensors resistance values NTC 10k

°C	20	30	40	50	60	70	80
Ω	12,090	8,313	5,828	4,161	3,021	2,229	1,669

From manual 199838, page 23.

Format System

Covers: Format System HE

NTC Thermistor resistance values NTC 10k

°C	20	30	40	50	60	70	80
Ω	12,090	8,313	5,828	4,161	3,021	2,229	1,669

From manual Cod. 6272255, page 26.

GIULIA COMBI

Covers: Giulia Combi 30

NTC Sensor Resistance Table (R25°C=10kΩ) NTC 10k

°C	0	25	75	80	100
Ω	27,279	10,000	1,925	1,669	973

From manual 6316191, page 20.

Meridian HE 25-30

Covers: Meridian HE 25

TABLE 4 (SM - SS - SF sensors) - NTC sensor resistance NTC 10k

°C	20	30	40	50	60	70	80
Ω	12,090	8,313	5,828	4,161	3,021	2,229	1,669

From manual 199838, page 19.

Murelle Advanced HE

Covers: Murelle Advanced HE Combi

NTC Sensor Resistance Table (R25°C=10kΩ)

TR	0°C	10°C	20°C	30°C	40°C	50°C	60°C	70°C	80°C	90°C	100°C
Resistance (Ω)	27279	17959	12090	8313	5828	4161	3021	2229	1669	1266	973

As printed in manual 6316191, page 15.

Murelle Elite HE 30 - 35 - 35 T ErP User

Covers: Murelle Elite HE 35 T ErP System

SM - SS - SF sensors NTC 10k

°C	20	30	40	50	60	70	80
Ω	12,090	8,313	5,828	4,161	3,021	2,229	1,669

From manual 6322860, page 28.

MURELLE ELITE HE 30-35-35 T

Covers: Murelle Elite HE 30, Murelle Elite HE 35T System

NTC Sensor Resistance Table (SM - SS - SF sensors) NTC 10k

°C	20	30	40	50	60	70	80
Ω	12,090	8,313	5,828	4,161	3,021	2,229	1,669

From manual 6322736, page 28.

MURELLE EV HE

Covers: Murelle EV HE 25 Combi, Murelle EV HE 25 System, Murelle EV HE 30 Combi, Murelle EV HE 30 System, Murelle EV HE 30 T System, Murelle EV HE 35 Combi, Murelle EV HE 35 System, Murelle EV HE 35 T System

TABLE 3 (SM - SS - SF sensors) NTC 10k

°C	20	30	40	50	60	70	80
Ω	12,090	8,313	5,828	4,161	3,021	2,229	1,669

From manual 6316194, page 28.

MURELLE HE

Covers: Murelle HE Combi with Cylinder, Murelle System HE 12, Murelle System HE 20, Murelle System HE 25, Murelle System HE 30, Murelle System HE 35

NTC sensor resistance table (SM - SS - SF sensors) NTC 10k

°C	20	30	40	50	60	70	80
Ω	12,090	8,313	5,828	4,161	3,021	2,229	1,669

From manual Cod. 6274264A, page 23.

MURELLE HR 35 R (M)

Covers: Murelle HE 35 R, Murelle HE 35 R M

SM - SR - SF sensors NTC resistance table NTC 10k

°C	20	30	40	50	60	70	80
Ω	12,090	8,313	5,828	4,161	3,021	2,229	1,669

From manual 6316160A, page 33.

Murelle One HE 25 - 30 HE

Covers: Murelle One HE 25, Murelle One HE 25 8115010, Murelle One HE 30, Murelle One HE 30 8115012

Dual / domestic hot water / external sensor resistance NTC 10k

°C	0	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31	32	33	34	35	36	37	38	39	40	41	42	43	44	45	46	47	48	49	50	51	52	53	54	55	56	57	58	59	60	61	62	63	64	65	66	67	68	69	70	71	72	73	74	75	76	77	78	79	80	81	82	83	84	85	86	87	88	89	90	91	92	93	94	95	96	97	100
Ω	27,279	26,135	25,044	24,004	23,014	22,069	21,168	20,309	19,489	18,706	17,959	17,245	16,563	15,912	15,289	14,694	14,126	13,582	13,062	12,565	12,090	11,634	11,199	10,781	10,382	9,999	9,633	9,281	8,945	8,622	8,313	8,016	7,731	7,458	7,196	6,944	6,702	6,470	6,247	6,033	5,828	5,630	5,440	5,258	5,082	4,913	4,751	4,595	4,444	4,300	4,161	4,026	3,897	3,773	3,653	3,538	3,426	3,319	3,216	3,116	3,021	2,928	2,839	2,753	2,669	2,589	2,512	2,437	2,365	2,296	2,229	2,164	2,101	2,040	1,982	1,925	1,870	1,817	1,766	1,717	1,669	1,622	1,577	1,534	1,491	1,451	1,411	1,373	1,336	1,300	1,266	1,232	1,199	1,168	1,137	1,108	1,079	1,051	973

From manual 6316191, page 20.

Murelle Pro HE 20 R MkII / 30 R MkII

Covers: Murelle Pro HE 20 R MkII, Murelle Pro HE 30 R MkII

Dual sensor (thermal safety/output) / domestic hot water sensor / external sensor resistance NTC 10k

°C	0	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31	32	33	34	35	36	37	38	39	40	41	42	43	44	45	46	47	48	49	50	51	52	53	54	55	56	57	58	59	60	61	62	63	64	65	66	67	68	69	70	71	72	73	74	75	76	77	78	79	80	81	82	83	84	85	86	87	88	89	90	91	92	93	94	95	96	97	100
Ω	27,279	26,135	25,044	24,004	23,014	22,069	21,168	20,309	19,489	18,706	17,959	17,245	16,563	15,912	15,289	14,694	14,126	13,582	13,062	12,565	12,090	11,634	11,199	10,781	10,382	9,999	9,633	9,281	8,945	8,622	8,313	8,016	7,731	7,458	7,196	6,944	6,702	6,470	6,247	6,033	5,828	5,630	5,440	5,258	5,082	4,913	4,751	4,595	4,444	4,300	4,161	4,026	3,897	3,773	3,653	3,538	3,426	3,319	3,216	3,116	3,021	2,928	2,839	2,753	2,669	2,589	2,512	2,437	2,365	2,296	2,229	2,164	2,101	2,040	1,982	1,925	1,870	1,817	1,766	1,717	1,669	1,622	1,577	1,534	1,491	1,451	1,411	1,373	1,336	1,300	1,266	1,232	1,199	1,168	1,137	1,108	1,079	1,051	973

From manual 6316191, page 18.

MURELLE PRO HE HO

Covers: 8112270

NTC R25°C; 10kΩ sensor resistance NTC 10k

°C	0	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31	32	33	34	35	36	37	38	39	40	41	42	43	44	45	46	47	48	49	50	51	52	53	54	55	56	57	58	59	60	61	62	63	64	65	66	67	68	69	70	71	72	73	74	75	76	77	78	79	80	81	82	83	84	85	86	87	88	89	90	91	92	93	94	95	96	97	100
Ω	27,279	26,135	25,044	24,004	23,014	22,069	21,168	20,309	19,489	18,706	17,959	17,245	16,563	15,912	15,289	14,694	14,126	13,582	13,062	12,565	12,090	11,634	11,199	10,781	10,382	9,999	9,633	9,281	8,945	8,622	8,313	8,016	7,731	7,458	7,196	6,944	6,702	6,470	6,247	6,033	5,828	5,630	5,440	5,258	5,082	4,913	4,751	4,595	4,444	4,300	4,161	4,026	3,897	3,773	3,653	3,538	3,426	3,319	3,216	3,116	3,021	2,928	2,839	2,753	2,669	2,589	2,512	2,437	2,365	2,296	2,229	2,164	2,101	2,040	1,982	1,925	1,870	1,817	1,766	1,717	1,669	1,622	1,577	1,534	1,491	1,451	1,411	1,373	1,336	1,300	1,266	1,232	1,199	1,168	1,137	1,108	1,079	1,051	973

From manual 6316191, page 15.

Planet Dewy 60-100 BFR

Covers: Planet Dewy BFR

NTC Heating Sensor Resistance (Table 1) NTC 10k

°C	20	30	40	50	60	70	80
Ω	12,090	8,313	5,828	4,161	3,021	2,229	1,669

From manual 199838, page 21.

Planet Super 4 W.M.

Covers: Planet Super 4 WM

NTC Thermistor Sensor Resistance NTC 10k

°C	20	30	40	50	60	70	80
Ω	12,090	8,313	5,828	4,161	3,021	2,229	1,669

From manual Cod. 6274227, page 17.

Viessmann

Vitodens 100-W Type B1HC, B1KC

Covers: Vitodens 100-W B1HC-19, Vitodens 100-W B1KC-35

Boiler water temperature sensor resistance curve NTC 12k

°C	10	30	50	70	90	110
Ω	22,100	9,900	4,600	2,300	1,200	700

From manual 5697787, page 53.

Boiler water temperature sensor resistance NTC 10k

°C	10	30	50	70	90	110
Ω	20,000	8,000	3,600	1,800	1,000	600

From manual 5697787, page 53.

Vitodens 100-W Type WB1B

Covers: Vitodens 100 W WB1B 30kW Combi Boiler

Outside temperature sensor resistance curve NTC 12k

°C	-15	-10	-5	0	10	20	30
Ω	76,300	58,800	45,800	35,900	22,500	14,400	9,400

From manual 5366 836 GB, page 38.

Vitodens 222-F Type FS2A Compact gas condensing boiler

Covers: Vitodens 222F FS2B 26kW Combi with Store

Outside temperature sensor resistance curve NTC 20k

°C	-20	-10	0	10	20	30
Ω	192,500	113,500	68,600	42,300	26,800	17,400

From manual 5692 816 GB, page 102.

Vokera

Condexa Pro

Covers: Condexa Pro

NTC Sensor Resistance Table NTC 10k

°C	-20	0	20	40	60	80	100
Ω	67,739	27,279	12,090	5,828	3,021	1,669	973

From manual 068464EN, page 35.

Verve I 50

Covers: Verve I 50

NTC Sensor Resistance (10kOhm @ 25°C) NTC 10k

°C	0	25	50	75	100
Ω	27,279	9,999	4,161	1,925	973

From manual 2012222, page 17.

Worcester Bosch

Gas-fired condensing combi appliance Greenstar 1000

Covers: Greenstar 1000 GR1000W 24 C, Greenstar 1000 GR1000W 30 C

Central heating flow and return NTC resistance characteristics NTC 10k

°C	0	5	10	15	20	25	35	50	60	70	80	90	95	100	110
Ω	33,404	25,902	20,247	15,950	12,657	10,115	6,586	3,624	2,500	1,759	1,260	918	788	680	510

From manual 6721835943, page 98.

Domestic Hot Water Sensor NTC 12k

°C	0	10	20	30	40	50	60	70	80	90
Ω	35,975	22,763	14,772	9,786	6,652	4,607	3,243	2,332	1,703	1,261

From manual 6721835943, page 98.

Greenstar 2000

Covers: Greenstar 2000 GR2301iW 25 C, Greenstar 2000 GR2301iW 30 C

Flow temperature sensor NTC resistance characteristics NTC 10k

°C	0	5	10	15	20	25	30	35	40	45	50	55	60	65	70	75	80	85	90	95	100
Ω	33,404	25,902	20,247	15,950	12,657	10,115	8,138	6,589	5,367	4,398	3,624	3,002	2,500	2,092	1,759	1,486	1,260	1,074	918	788	680

From manual 6721839340, page 95.

DHW temperature sensor NTC resistance characteristics NTC 10k

°C	0	10	20	30	40	50	60	70	80	90
Ω	33,242	19,947	12,394	7,947	5,242	3,548	2,459	1,740	1,256	923

From manual 6721839340, page 95.

Flow temperature sensor NTC resistance characteristics NTC 10k

°C	0	20	40	60	80	100
Ω	33,404	12,657	5,367	2,500	1,260	680

From manual 6721839340, page 95.

Greenstar 24/28

Covers: Greenstar 24, Greenstar 28

Flow and DHW temperature sensors resistance NTC 12k

°C	20	25	30	35	40	45	50	55	60	65	70	75	80	85	90	95	100
Ω	14,772	11,981	9,786	8,047	6,653	5,523	4,608	3,856	3,243	2,744	2,332	1,990	1,704	1,464	1,262	1,093	950

From manual 6 720 800 945, page 44.

Greenstar 24/28/30 Wall Hung RSF Gas Fired Condensing Combination Boiler

Covers: Greenstar 30

Flow temperature sensor NTC sensor resistance NTC 12k

°C	20	25	30	35	40	45	50	55	60	65	70	75	80	85	90	95	100
Ω	14,772	11,981	9,786	8,047	6,653	5,523	4,608	3,856	3,243	2,744	2,332	1,990	1,704	1,464	1,262	1,093	950

From manual 6 720 811 922, page 49.

DHW temperature sensor NTC sensor resistance NTC 10k

°C	0	10	20	30	40	50	60	70	80	90
Ω	33,242	19,947	12,394	7,947	5,242	3,548	2,459	1,740	1,256	923

From manual 6 720 811 922, page 49.

GREENSTAR 29 HE Conventional / ZB 7 27 HE (System)

Covers: ZB 7 27 HE

CH flow NTC sensor resistance table NTC 12k

°C	20	25	30	35	40	45	50	55	60	65	70	75	80	85	90	95	100
Ω	14,772	11,981	9,786	8,047	6,653	5,523	4,608	3,856	3,243	2,744	2,332	1,990	1,704	1,464	1,262	1,093	950

From manual 6 720 611 137 GB, page 52.

Greenstar 4000

Covers: Greenstar 4000 GR4700iW 12 S, Greenstar 4000 GR4700iW 15 S, Greenstar 4000 GR4700iW 18 S, Greenstar 4000 GR4700iW 21 S

Sensor values - Flow temperature sensor NTC 10k

°C	0	5	10	15	20	25	30	35	40	45	50	55	60	65	70	75	80	85	90	95
Ω	33,404	25,902	20,247	15,950	12,657	10,115	8,138	6,589	5,367	4,398	3,624	3,002	2,500	2,092	1,759	1,486	1,260	1,074	918	788

From manual 6 720 891 162, page 88.

Greenstar 4000 Gas-fired condensing combi appliance

Covers: Greenstar 4000 GR4700iW 25 C, Greenstar 4000 GR4700iW 30 C

Sensor values - Flow temperature sensor NTC 10k

°C	0	5	10	15	20	25	30	35	40	45	50	55	60	65	70	75	80	85	90	95
Ω	33,404	25,902	20,247	15,950	12,657	10,115	8,138	6,589	5,367	4,398	3,624	3,002	2,500	2,092	1,759	1,486	1,260	1,074	918	788

From manual 6 720 891 161, page 88.

Greenstar 8000 F Combi

Covers: Greenstar 8000 F GR8700iF 35 C, Greenstar 8000 F GR8700iF 50 C

Sensor values - Flow and DHW temperature sensor NTC 10k

°C	0	5	10	15	20	25	30	35	40	45	50	55	60	65	70	75	80	85	90	95
Ω	33,404	25,902	20,247	15,950	12,657	10,115	8,138	6,589	5,367	4,398	3,624	3,002	2,500	2,092	1,759	1,486	1,260	1,074	918	788

From manual 6721106419, page 96.

Greenstar 8000 F Regular

Covers: Greenstar 8000 F GR8700iF 35 R, Greenstar 8000 F GR8700iF 50 R

Sensor values - Flow temperature sensor NTC 10k

°C	0	5	10	15	20	25	30	35	40	45	50	55	60	65	70	75	80	85	90	95
Ω	33,404	25,902	20,247	15,950	12,657	10,115	8,138	6,589	5,367	4,398	3,624	3,002	2,500	2,092	1,759	1,486	1,260	1,074	918	788

From manual 6721106420, page 89.

Greenstar 8000 Life

Covers: Greenstar 8000 Life GR8300iW 30 C, Greenstar 8000 Life GR8300iW 35 C, Greenstar 8000 Life GR8300iW 40 C, Greenstar 8000 Life GR8300iW 45 C, Greenstar 8000 Life GR8300iW 50 C

Flow sensor resistance NTC 10k

°C	0	5	10	15	20	25	30	35	40	45	50	55	60	65	70	75	80	85	90	95
Ω	33,404	25,902	20,247	15,950	12,657	10,115	8,138	6,589	5,367	4,398	3,624	3,002	2,500	2,092	1,759	1,486	1,260	1,074	918	788

From manual 6720883865, page 88.

Greenstar 8000 Life

Covers: Greenstar 8000 Life GR8300iW 30 S, Greenstar 8000 Life GR8300iW 35 S

Flow sensor resistance NTC 10k

°C	0	5	10	15	20	25	30	35	40	45	50	55	60	65	70	75	80	85	90	95
Ω	33,404	25,902	20,247	15,950	12,657	10,115	8,138	6,589	5,367	4,398	3,624	3,002	2,500	2,092	1,759	1,486	1,260	1,074	918	788

From manual 6720883858, page 69.

Greenstar 8000 Life

Covers: Greenstar 8000 Life GR8300iW 35 R, Greenstar 8000 Life GR8300iW 45 R

Flow sensor resistance NTC 10k

°C	0	5	10	15	20	25	30	35	40	45	50	55	60	65	70	75	80	85	90	95
Ω	33,404	25,902	20,247	15,950	12,657	10,115	8,138	6,589	5,367	4,398	3,624	3,002	2,500	2,092	1,759	1,486	1,260	1,074	918	788

From manual 6720883866, page 80.

Greenstar 8000 Style

Covers: Greenstar 8000 Style GR8700iW 30 C, Greenstar 8000 Style GR8700iW 30 CB, Greenstar 8000 Style GR8700iW 35 C, Greenstar 8000 Style GR8700iW 35 CB, Greenstar 8000 Style GR8700iW 40 C, Greenstar 8000 Style GR8700iW 40 CB, Greenstar 8000 Style GR8700iW 45 C, Greenstar 8000 Style GR8700iW 50 C

Flow temperature sensor resistance NTC 12k

°C	20	25	30	35	40	45	50	55	60	65	70	75	80	85	90	95	100
Ω	14,772	11,981	9,786	8,047	6,653	5,523	4,608	3,856	3,243	2,744	2,332	1,990	1,704	1,464	1,262	1,093	950

From manual 6720883864, page 73.

Greenstar 8000 Style

Covers: Greenstar 8000 Style GR8700iW 30 S, Greenstar 8000 Style GR8700iW 35 S, Greenstar 8000 Style GR8700iW 35 SB

Flow sensor resistance NTC 12k

°C	20	25	30	35	40	45	50	55	60	65	70	75	80	85	90	100
Ω	14,772	11,981	9,786	8,047	6,653	5,523	4,608	3,856	3,243	2,744	2,332	1,990	1,704	1,464	1,262	950

From manual 6720883855, page 71.

Flow temperature sensor NTC 12k

°C	20	25	30	35	40	45	50	55	60	65	70	75	80	85	90	95	100
Ω	14,772	11,981	9,786	8,047	6,653	5,523	4,608	3,856	3,243	2,744	2,332	1,990	1,704	1,464	1,262	1,093	950

From manual 6720883855, page 71.

Greenstar 8000+

Covers: Greenstar 8000+ GR8701iW 30 R, Greenstar 8000+ GR8701iW 35 R

Flow sensor resistance NTC 12k

°C	0	5	10	15	20	25	30	35	40	45	50	55	60	65	70	75	80	85	90	95	100
Ω	35,975	28,538	22,763	18,284	14,772	12,000	9,786	8,054	6,652	5,523	4,607	3,856	3,243	2,744	2,332	1,990	1,703	1,464	1,261	1,093	949

From manual 6721891104, page 81.

Greenstar 8000+

Covers: Greenstar 8000+ GR8701iW 30 S, Greenstar 8000+ GR8701iW 35 S

Flow sensor resistance NTC 12k

°C	0	5	10	15	20	25	30	35	40	45	50	55	60	65	70	75	80	85	90	95	100
Ω	35,975	28,538	22,763	18,284	14,772	12,000	9,786	8,054	6,652	5,523	4,607	3,856	3,243	2,744	2,332	1,990	1,703	1,464	1,261	1,093	949

From manual 6721891100, page 86.

Greenstar 8000+ / Greenstar 8000+ Style

Covers: Greenstar 8000+ GR8701iW 36 C, Greenstar 8000+ GR8701iW 45 C, Greenstar 8000+ GR8701iW 50 C, Greenstar 8000+ Style GR8701iW 32 CB Style

Flow sensor resistance NTC 12k

°C	0	5	10	15	20	25	30	35	40	45	50	55	60	65	70	75	80	85	90	95	100
Ω	35,975	28,538	22,763	18,284	14,772	12,000	9,786	8,054	6,652	5,523	4,607	3,856	3,243	2,744	2,332	1,990	1,703	1,464	1,261	1,093	949

From manual 6721891026, page 85.

Greenstar HE combi / Greenstar HE plus combi

Covers: Greenstar Zwbr 11-35 HE Plus, ZWB 7-25

CH flow NTC sensor, heat store NTC sensor, constant hot water NTC sensor and hot water NTC sensor NTC 12k

°C	20	25	30	35	40	45	50	55	60	65	70	75	80	85	90	95	100
Ω	14,772	11,981	9,786	8,047	6,653	5,523	4,608	3,856	3,243	2,744	2,332	1,990	1,704	1,464	1,262	1,093	950

From manual 6 720 610 576 / 6 720 610 597, page 45.

Greenstar i ErP Installation, commissioning

Covers: Greenstar 25i ErP, Greenstar 30i ErP

Central heating flow sensor resistance NTC 12k

°C	0	5	10	15	20	25	30	35	40	45	50	55	60	65	70	75	80	85	90	95	100
Ω	35,975	28,516	22,763	18,279	14,772	11,981	9,786	8,047	6,653	5,523	4,608	3,856	3,243	2,744	2,332	1,990	1,704	1,464	1,262	1,093	950

From manual 6 720 806 944, page 68.

Domestic hot water sensor resistance NTC 12k

°C	0	5	10	15	20	25	30	35	40	45	50	55	60	65	70	75	80	85	90	95	100
Ω	36,005	28,540	22,782	18,294	14,785	11,991	9,794	8,054	6,658	5,527	4,612	3,859	3,246	2,747	2,334	1,991	1,705	1,465	1,263	1,094	951

From manual 6 720 806 944, page 68.

Greenstar i System ErP

Covers: Greenstar 12i System ErP, Greenstar 15i System ErP, Greenstar 18i System ErP, Greenstar 21i System ErP, Greenstar 24i System ErP, Greenstar 9i System ErP

Flow temperature NTC sensor resistance NTC 12k

°C	0	5	10	15	20	25	30	35	40	45	50	55	60	65	70	75	80	85	90	95	100
Ω	35,975	28,516	22,763	18,279	14,772	11,981	9,786	8,047	6,653	5,523	4,608	3,856	3,243	2,744	2,332	1,990	1,704	1,464	1,262	1,093	950

From manual 6 720 806 945, page 70.

DHW NTC sensor resistance NTC 12k

°C	0	5	10	15	20	25	30	35	40	45	50	55	60	65	70	75	80	85	90	95	100
Ω	36,005	28,540	22,782	18,294	14,785	11,991	9,794	8,054	6,658	5,527	4,612	3,859	3,246	2,747	2,334	1,991	1,705	1,465	1,263	1,094	951

From manual 6 720 806 945, page 70.

Greenstar Ri ErP +

Covers: Greenstar 12Ri ErP+, Greenstar 9Ri ErP+

Flow temperature (NTC) sensor resistance NTC 12k

°C	0	5	10	15	20	25	30	35	40	45	50	55	60	65	70	75	80	85	90	95	100
Ω	35,975	28,516	22,763	18,279	14,772	11,981	9,786	8,047	6,653	5,523	4,608	3,856	3,243	2,744	2,332	1,990	1,704	1,464	1,262	1,093	950

From manual 6 720 821 670, page 62.

Worcester 2000 Gas-fired condensing combi appliance

Covers: 2000 GC2000iW 25 C NG, 2000 GC2000iW 30 C

Flow temperature sensor NTC resistance NTC 10k

°C	0	5	10	15	20	25	30	35	40	45	50	55	60	65	70	75	80	85	90	95	100
Ω	33,404	25,902	20,247	15,950	12,657	10,115	8,138	6,589	5,367	4,398	3,624	3,002	2,500	2,092	1,759	1,486	1,260	1,074	918	788	680

From manual 6 721 814 551, page 75.

DHW temperature sensor NTC resistance NTC 10k

°C	0	10	20	30	40	50	60	70	80	90
Ω	33,242	19,947	12,394	7,947	5,242	3,548	2,459	1,740	1,256	923

From manual 6 721 814 551, page 75.

WORCESTER GREENSTAR 25CDi / 30CDi / 35CDi / 40CDi

Covers: Greenstar Cdi 40 Cdi

NTC Sensor Resistance Values (CH Flow and DHW Sensor) NTC 12k

°C	20	25	30	35	40	45	50	55	60	65	70	75	80	85	90	95	100
Ω	14,772	11,981	9,786	8,047	6,653	5,523	4,608	3,856	3,243	2,744	2,332	1,990	1,704	1,464	1,262	1,093	950

From manual 6 720 611 927b, page 204.

Zanussi

ULTRA SYSTEM 15 18 24 30

Covers: Ultra System 18, Ultra System 24, Ultra System 30

NTC Sensor Resistance Table (Control/No Flow, Return Thermistors)

Temperature	Resistance (Ohms)
25 oC	9,700 - 10,300
60 oC	2,400 - 2,600
85 oC	1,000 - 1,100

As printed in manual UIN 214119 A01, page 53.

NTC Sensor Resistance Table (Control / No Flow & Return Thermistors)

Temperature	Resistance
25 oC	9,700 - 10,300 Ohms
60 oC	2,400 - 2,600 Ohms
85 oC	1,000 - 1,100 Ohms

As printed in manual UIN 214119 A01, page 53.

NTC Sensor Resistance Table (Control / No Flow Thermistor & Return Thermistor)

Temperature	Resistance (Ohms)
25 °C	9,700 - 10,300
60 °C	2,400 - 2,600
85 °C	1,000 - 1,100

As printed in manual UIN 214119 A01, page 53.

Zanussi Ultra Combi 30 35

Covers: Ultra Combi 35

Return sensor resistance

Temperature (°C)	Resistance (Ω)
25	9700 - 10300
60	2400 - 2600
85	1000 - 1100

As printed in manual UIN 214118 A02, page 55.

The app

The sensor values for the boiler in front of you

Flint has the component data from the manufacturer's manual for each boiler, sensor tables included, with the page they came from. Plus fault codes, service mode and Ask Flint for anything the manual covers.

Start 7 days free

Then £3.99 a month or £29.99 a year. Cancel any time.

Service mode and combustion checks are work for a competent, Gas Safe registered engineer. These procedures are taken from the manufacturers' manuals and inform your judgement; they don't replace it. Always work to the manual for the exact appliance, its data badge and the current standards.