Potterton boiler service mode

Envoy Flowsure & Envoy Flowsure+

Covers: Envoy Plus

GC 41-607-89

Enter Installer Adjustment Mode

1. From Stand-by: Press the Lockout Reset/Function Button twice and the display will change to a flashing.
2. From Central Heating: Press the Lockout Reset/Function Button once and the flashing will change to a flashing.
3. Depress the Lockout/Reset function button and hold down for around 5 seconds. The Status/Function display will change.

From manual 559779, page 20.

Force Max & Min Fan Speed Rate

1. Enter the INSTALLER MODE on the control board and set the MAXIMUM fan speed G to 40 to force minimum modulation.
2. Enter the INSTALLER MODE on the control board and set the MINIMUM fan speed G to 99 to force maximum modulation.

From manual 559779, page 38.

THE BURNER PRESSURE AND GAS RATE HAVE BEEN PRECISELY SET AND CHECKED DURING MANUFACTURE AND NO ATTEMPT SHOULD BE MADE TO ADJUST IT. Setting the burner pressures on a modulating gas/air control valve is a complex procedure and should only be attempted by a competent person. Incorrect adjustment will impede the performance of the boiler and may result in HAZARDOUS COMBUSTION. (page 17)

Gold 18 Heat ErP

Covers: Gold 15 Heat ErP, Gold 18 Heat ErP, Gold 24 Heat ErP

GC 41-592-51, 41-592-52, 41-592-53

Setting Boiler to Maximum Rate (for combustion check)

1. Ensure all external controls are calling for heat
2. Ensure the system is cold
3. Ensure the boiler control knob is turned fully clockwise
4. Allow the combustion to stabilise before inserting probe

From manual 7221179 - 01, page 39.

Setting Boiler to Operate at Low Rate

1. Set boiler to operate at a low rate
2. If not possible to adjust using boiler controls, set system so boiler modulates to as low an input as possible without burner extinguishing (e.g. by closing radiator valves)
3. Allow combustion to stabilise
4. Check and record gas rate whilst operating in this condition

From manual 7221179 - 01, page 39.

CO₂ and CO from manual 7221179 - 01, page 48. Check against the data badge.

The boiler is self-regulating dependent upon the system load. No adjustment of the gas valve is permissible. (page 38)

Heatmax Combi HE Range Condensing Combination Boiler

Covers: Heatmax Combi 24 HE, Heatmax Combi 28 HE, Heatmax Combi 33 HE

GC 47-393-27, 47-393-28, 47-393-29

Enter Calibration / Service Mode (Maximum & Minimum Rate)

1. Ensure that all external controls are calling for heat. The actual current boiler temperature is shown on the display.
2. Turn both temperature control knobs fully anticlockwise, then quickly turn the right hand knob 1/4 clockwise twice and back fully anticlockwise.
3. The display will now alternate between 'SF' and the current boiler temperature and both green LEDs will flash.
4. To set to maximum rate: Turn the left hand knob fully clockwise. The display will show '00', indicating maximum rate, then revert to 'P' alternating with the current boiler temperature.
5. To set to minimum rate: Turn the left hand knob fully anti-clockwise. When the display reads ' 0' the boiler runs at minimum rate.
6. This function is maintained for 20 minutes unless the maximum CH temperature is exceeded. The function can be disabled at any time by turning the right hand knob.

From manual 7200372, page 34.

CO₂ and CO from manual 7200372, page 49. Check against the data badge.

To assist the boiler to light prior to final setting, use a suitable hexagon key to wind out the throttle adjustment screw until it is flush with the valve body, then turn the screw 4 full turns clockwise. If the boiler will not light, or the correct CO2 cannot be achieved contact the ‘heateam’ technical helpline. (page 48)

Performa 28

Covers: Performa 28

GC 47-393-07

Enter/Exit Service Mode

1. Turn the selector switch fully anticlockwise against the spring pressure to the reset position and hold for at least 3 seconds to reset the boiler.

From manual 5113939, page 28.

Force Max/Min Rate

1. Check/Set max rate: Turn selector switch to ON position (heating and DHW), turn a hot water tap on to at least 10 l/min. Use 8mm nut on gas valve to adjust max.
2. Check/Set min rate: Remove one modulator wire. Use 5mm nut on gas valve to adjust min.

From manual 5113939, page 25.

The gas valve is factory-set. The smaller nut (5mm) adjusts minimum pressure and the larger nut (8mm) maximum pressure. (page 25)

Performa 30 HE

Covers: Performa 30 HE

GC 47-393-13

Entering/Setting Service Mode

1. Turn selector switch to the Off position.
2. Slacken pressure test point screw on gas valve and connect pressure gauge.
3. Turn selector switch fully anticlockwise against spring to Reset position, hold for 2 seconds.
4. Turn selector switch to the Central Heating and Domestic Hot Water position.
5. Turn on hot water tap to flow rate of at least 10 l/min.
6. Adjust burner pressure using modulator nut (Max: larger 8mm nut, Min: smaller 5mm nut).

From manual 5111815, page 25.

The gas valve is factory set. (page 25)

Performa System HE

Covers: Performa System 12 HE, Performa System 28 HE

GC 41-591-24, 41-591-27

Checking and Setting Burner Pressure (Min and Max Rate)

1. Ensure that all external controls are calling for heat, turn the temperature control to maximum, and the selector switch to the Off position.
2. Slacken the pressure test point sealing screw on the gas valve and connect a pressure gauge.
3. Undo the screws securing the inner door panel and lift the panel slightly to disengage it from the studs on top of the case.
4. Turn the selector switch fully anticlockwise against the spring pressure to the 'Reset' position and hold for 2 seconds to reset, then turn to the On position.
5. To check and set minimum pressure, first remove one of the modulator wires.
6. Remove the plastic protection cap from the pressure adjustment nuts on the valve (smaller nut/5mm adjusts minimum pressure, larger nut/8mm adjusts maximum pressure).
7. Using a suitable spanner, adjust the relevant nut until the correct pressure is achieved.
8. Once the pressure has been set, turn the boiler off, disconnect the pressure gauge, tighten the pressure test screw, and refit the modulator to the valve.

From manual 5111817, page 28.

To check and set minimum pressure first remove one of the modulator wires. The smaller nut (5mm) adjusts minimum pressure and the larger nut (8mm) maximum pressure. (page 28)

Potterton Apollo Condensing Combination Boiler

Covers: Apollo 25, Apollo 30

GC 47-393-37, 47-393-38

Enter Calibration Mode (Service Mode / Force Max & Min Rate)

1. Ensure that all controls are calling for heat, and the selector switch is in the central heating and hot water position.
2. Turn both temperature control knobs fully anticlockwise, then quickly turn the DHW temperature knob 1/4 clockwise twice and back fully anticlockwise.
3. The display will alternate between 'SF' and the current boiler temperature and both green LEDs will flash.
4. To run at maximum rate: turn CH temperature control knob fully clockwise until the display changes to '00' then reverts to 'P' alternating with current boiler temperature.
5. To run at minimum rate: turn CH temperature control knob fully anticlockwise until the display reads '0'.

From manual 7209286 - 02 (7/12), page 35.

CO₂ and CO from manual 7209286 - 02 (7/12), page 48. Check against the data badge.

The combustion for this appliance has been checked, adjusted and preset at the factory for operation on the gas type specified on the appliance data plate. No measurement of the combustion is necessary. Do not adjust the air/gas ratio valve. (page 34)

Potterton Assure Combi

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

GC 47-393-58, 47-393-59, 47-393-67, 47-393-69, 47-393-70

Entering Chimney Sweep Mode (Maximum / Minimum Output)

1. Turn both control knobs fully anticlockwise and leave for 10 seconds.
2. Turn the DHW knob (tap symbol) 1/4 turn twice in quick succession (within 2 seconds).
3. "304" will appear in the display.
4. Turn the CH knob (radiator symbol) fully clockwise. "100" will appear in the display, indicating maximum output.
5. After checking at maximum turn the CH knob (radiator symbol) fully anticlockwise. "0" will appear in the display, indicating minimum output.

From manual 7717311-01, page 50.

Entering Calibration Mode (Gas Valve / CO2 Setting)

1. Ensure that all external controls are calling for heat. The actual current boiler temperature is shown on the display.
2. Turn both control knobs fully anticlockwise, then quickly turn the right hand knob 1/4 clockwise twice and back in quick succession (within 2 seconds). '304' will appear in the display screen.
3. Turn the left hand knob fully clockwise. '100' will appear in the display screen, indicating maximum output.
4. To check at minimum rate, turn the left hand knob fully anticlockwise until the display reads '0'.

From manual 7717311-01, page 62.

CO₂ and CO from manual 7717311-01, page 62, 76. Check against the data badge.

After replacing the gas valve the CO2 must be checked and adjusted. Only change the valve if a suitable calibrated combustion analyser is available, operated by a competent person. (page 61)

Potterton Assure Heat Condensing Central Heating Boiler

Covers: Assure 13 Heat, Assure 16 Heat, Assure 19 Heat, Assure 25 Heat, Assure 30 Heat

GC 41-592-66, 41-592-67, 41-592-68, 41-592-69, 41-592-70

Enter Chimney Sweep Mode (Service Mode) and Adjust Rate

1. Press the Chimney Sweep button for approximately 3 seconds.
2. CSM is activated and will go to the min rate (status signal is orange and flashes green briefly).
3. Pressing the Chimney Sweep button again once will make it adjust to max rate (orange status light goes off briefly once and maximum rate is selected).
4. To exit, briefly press the RESET button to return the boiler to normal operating status.

From manual 7684200-01, page 43.

CO₂ and CO from manual 7684200-01, page 55. Check against the data badge.

Potterton Gold Combi 24 - 28 - 33 / 28 LPG

Covers: Gold 24 Combi ErP, Gold 28 Combi ErP, Gold 33 Combi ErP

GC 47-393-43, 47-393-44, 47-393-45, 47-393-46

Enter Calibration / Service Mode (Max & Min Rate)

1. Ensure that all external controls are calling for heat and the selector switch is in the central heating and hot water position.
2. Turn both temperature control knobs fully anticlockwise, then quickly turn the right hand (DHW) temperature knob 1/4 clockwise twice and back fully anticlockwise.
3. The display will now alternate between 'SF' and the current boiler temperature and both green LEDs will flash.
4. To set to maximum rate: Turn the left hand (CH) temperature control knob fully clockwise. The display will show '00' indicating maximum rate, then revert to 'P' alternating with current boiler temperature.
5. To set to minimum rate: Turn the left hand (CH) temperature control knob fully anticlockwise. When the display reads '0' the boiler runs at minimum rate.
6. This function is maintained for 20 minutes unless the maximum CH temperature is exceeded, and can be disabled at any time by turning the right hand knob.

From manual 7654263 - 03, page 30.

CO₂ and CO from manual 7654263 - 03, page 45, 54. Check against the data badge.

After replacing the valve the CO2 must be checked and adjusted as detailed in Section 14.0 Setting the Gas Valve. Only change the valve if a suitable calibrated combustion analyser is available, operated by a competent person. (page 44)

Potterton Gold Combi 24, 28 & 33 HE

Covers: Gold Combi HE

GC 47-590-05, 47-590-06, 47-590-19

Enter Calibration Mode (Service / Max / Min Rate)

1. Turn both temperature control knobs fully anticlockwise.
2. Quickly turn the DHW temperature knob 1/4 clockwise twice and back fully anticlockwise.
3. The display will now alternate between 'SF' and the current boiler temperature and both green LEDs will flash.
4. To force maximum rate: Turn CH temperature control knob fully clockwise. The display will show '0' to '00' indicating maximum rate, then revert to 'P' alternating with current boiler temperature.
5. To force minimum rate: Turn the CH temperature control knob fully anticlockwise until the display reads '0'.

From manual 5116282, page 35.

Exit Calibration Mode

1. The Calibration Function is active for 20 minutes unless the maximum CH temperature is exceeded.
2. The function can be disabled at any time by turning the DHW temperature knob.

From manual 5116282, page 35.

CO₂ and CO from manual 5116282, page 49. Check against the data badge.

The gas valve is factory set and the burner pressure cannot be measured as it is altered by suction of the fan and modulates as demand on the boiler alters. (page 35)

Potterton Gold System ErP Condensing System Boiler

Covers: Gold 18 System ErP, Gold 24 System ErP, Gold 28 System ErP

GC 41-592-39, 41-592-40, 41-592-41

Enter Calibration Mode (Force Max/Min Rate)

1. Ensure that all external controls are calling for heat. The actual current boiler temperature is shown on the display.
2. Turn both control knobs fully anticlockwise, then quickly turn the right hand knob 1/4 clockwise twice and back fully anticlockwise.
3. The display will now alternate between ‘SF’ and the current boiler temperature and both green LEDs will flash.
4. To set to maximum rate: Turn the left hand knob fully clockwise. As the knob is turned the display will change, indicating the fan speed. The display will show ‘00’, indicating maximum rate, then revert to ‘P’ alternating with the current boiler temperature.
5. To set to minimum rate: Turn the left hand knob fully anti-clockwise. As the knob is turned the display will change, indicating the fan speed. When the display reads ‘ 0’ the boiler runs at minimum rate.
6. This function is maintained for 20 minutes unless the maximum CH temperature is exceeded. The function can be disabled at any time by turning the right hand knob.

From manual 7654288 - 01, page 27.

CO₂ and CO from manual 7654288 - 01, page 40. Check against the data badge.

To assist the boiler to light prior to final setting, use a suitable hexagon key to wind out the Throttle Adjustment Screw until it is flush with the valve body, then turn the screw 4 full turns clockwise. If the boiler will not light, or the correct CO2 cannot be achieved call Baxi Customer Support 0344 871 1525. (page 39)

Potterton Promax 12 - 15 - 18 - 24 - 32 System ErP

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

GC 41-592-42, 41-592-43, 41-592-44, 41-592-45, 41-592-46

Enter Calibration Mode (Force Max & Min Rate)

1. Ensure that all external controls are calling for heat. The actual current boiler temperature is shown on the display.
2. Turn both temperature control knobs fully anticlockwise, then quickly turn the right hand knob (Calibration Control) 1/4 clockwise twice and back fully anticlockwise.
3. The display will now alternate between 'SF' and the current boiler temperature and both green LEDs will flash.
4. To set to maximum rate: Turn the left hand knob fully clockwise. As the knob is turned the display will change, indicating the fan speed, show '00' indicating maximum rate, then revert to 'P' alternating with the current boiler temperature.
5. To set to minimum rate: Turn the left hand knob fully anti-clockwise. As the knob is turned the display will change, indicating fan speed. When the display reads '0' the boiler runs at minimum rate.
6. This function is maintained for 20 minutes unless the maximum CH temperature is exceeded. The function can be disabled at any time by turning the right hand knob.

From manual 7654291 - 01, page 28.

CO₂ and CO from manual 7654291 - 01, page 42. Check against the data badge.

After replacing the valve the CO2 must be checked and adjusted as detailed in Section 14.0 Setting the Gas Valve. Only change the valve if a suitable calibrated combustion analyser is available, operated by a competent person. (page 41)

Potterton Promax 24 - 28 - 33 Combi ErP

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

GC 47-393-47, 47-393-48, 47-393-49

Entering Calibration / Service Mode (to force max or min rate)

1. Ensure that all external controls are calling for heat, and the selector switch is in the central heating and hot water position.
2. Turn both temperature control knobs fully anticlockwise.
3. Quickly turn the right hand (DHW) temperature control knob 1/4 clockwise twice and back fully anticlockwise.
4. The display will now alternate between 'SF' and the current boiler temperature and both green LEDs will flash.
5. To set to maximum rate: Turn the left hand (CH) temperature control knob fully clockwise. The display will show '00', indicating maximum rate, then revert to 'P' alternating with the current boiler temperature.
6. To set to minimum rate: Turn the left hand (CH) temperature control knob fully anti-clockwise. When the display reads '0' the boiler runs at minimum rate.
7. This function is maintained for 20 minutes unless the maximum CH temperature is exceeded.
8. The function can be disabled at any time by turning the right hand (DHW) temperature control knob.

From manual 7654260 - 03 (03/17), page 29.

CO₂ and CO from manual 7654260 - 03 (03/17), page 44. Check against the data badge.

IMPORTANT: After replacing the valve the CO2 must be checked and adjusted as detailed in Section 14.0 Setting the Gas Valve. Only change the valve if a suitable calibrated combustion analyser is available, operated by a competent person - see section 12.1. (page 43)

Potterton Promax Combi 24, 28 & 33 HE Plus

Covers: Baxi Combi 130 HE, Promax Combi 24 HE Plus, Promax Combi 33 HE Plus

GC 47-393-17, 47-590-03, 47-590-04

Enter Calibration (Service) Mode

1. Ensure that all external controls are calling for heat.
2. Turn both temperature control knobs fully anticlockwise.
3. Quickly turn the DHW temperature knob 1/4 clockwise twice and back fully anticlockwise.

From manual 5114444, page 34.

Force Maximum and Minimum Rate

1. After entering calibration mode, the display will alternate between 'SF' and current boiler temperature with both green LEDs flashing.
2. Turn CH temperature control knob fully clockwise to set maximum rate (display changes from '0' to '00', then reverts to 'P' alternating with current boiler temperature).
3. Turn CH temperature control knob fully anticlockwise to set minimum rate (when display reads '0' the boiler runs at minimum rate).

From manual 5114444, page 34.

CO₂ and CO from manual 5114444, page 47. Check against the data badge.

The gas valve is factory set and the burner pressure cannot be measured as it is altered by suction of the fan and modulates as demand on the boiler alters. The gas supply pressure should be 20mb. (page 34)

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

GC 47-393-54, 47-393-55, 47-393-56, 47-393-57

Enter Chimney Sweep Function (Max and Min Rate)

1. Press the i P button and the |||+ button together and hold for at least 6 seconds.
2. 'On' will be displayed briefly, followed by '304' then the boiler output expressed as percentage i.e. '100'.
3. Press the |||- button until '00' is displayed, indicating minimum input.
4. To exit the function press the i P button and the |||+ button together for 6 seconds.

From manual 7654258-07, page 30.

Calibration Function

1. Do not commence the Calibration Function whilst the burner is lit! The case front panel MUST be fitted.
2. The function is activated by pressing buttons 'IIII-' and 'R' together for 6 seconds then quickly pressing button 'i P' while 'On' is displayed.
3. The Ignition Phase fan speed code will then be displayed. Calibration will take approximately 5 minutes.
4. The boiler will automatically calibrate at '100', the Ignition Phase speed then '00'.
5. To exit the function press 'R'. 'ESC' will be displayed and the calibration function completed.

From manual 7654258-07, page 44.

CO₂ and CO from manual 7654258-07, page 43, 44. Check against the data badge.

The combustion for this appliance has been checked, adjusted and preset at the factory for operation on the gas type specified on the appliance data plate. No measurement of the combustion is necessary. Do not adjust the air/gas ratio valve. (page 29)

Potterton Titanium Combi ErP

Covers: Titanium 24 Combi ErP, Titanium 28 Combi ErP, Titanium 33 Combi ErP, Titanium 40 Combi ErP

GC 47-393-50, 47-393-51, 47-393-52, 47-393-53

Entering Calibration / Service Mode

1. Ensure that all external controls are calling for heat. The actual current boiler temperature is shown on the display.
2. Turn both control knobs fully anticlockwise, then quickly turn the right hand knob 1/4 clockwise twice and back fully anticlockwise.
3. The display will now alternate between 'SF' and the current boiler temperature and both green LEDs will flash.
4. To set to maximum rate: Turn the left hand knob fully clockwise. As the knob is turned the display will change, indicating the fan speed, showing '00' for maximum rate, then reverting to 'P' alternating with the current boiler temperature.
5. To set to minimum rate: Turn the left hand knob fully anti-clockwise. As the knob is turned the display will change, indicating the fan speed. When the display reads ' 0' the boiler runs at minimum rate.
6. This function is maintained for 20 minutes unless the maximum CH temperature is exceeded, and can be disabled at any time by turning the right hand knob (or DHW temperature knob depending on section).

From manual 7654277 - 01, page 30.

CO₂ and CO from manual 7654277 - 01, page 46. Check against the data badge.

To assist the boiler to light prior to final setting, use a suitable hexagon key to wind out the throttle adjustment screw until it is flush with the valve body, then turn the screw 4 full turns clockwise. If the boiler will not light, or the correct CO2 cannot be achieved call Baxi Customer Support 0344 871 1525. (page 45)

Potterton Titanium Heat

Covers: Titanium 12 Heat, Titanium 15 Heat, Titanium 18 Heat, Titanium 24 Heat, Titanium 30 Heat

GC 41-592-61, 41-592-62, 41-592-63, 41-592-64, 41-592-65

Enter / Exit Chimney Sweep Mode (Service Mode)

1. Press the Chimney Sweep button for 3 seconds to activate CSM and go to minimum rate.
2. Pressing the Chimney Sweep button again will adjust the boiler to maximum rate.
3. To exit Chimney Sweep Mode, press the RESET button for 3 seconds.

From manual 7684199-01, page 43.

Force Max & Min Rate via Chimney Sweep Button

1. Press the Chimney Sweep button for approximately 3 seconds to select minimum rate (status signal flashes green briefly, status light is orange).
2. Press the Chimney Sweep button once more to select maximum rate (status light goes off briefly once).

From manual 7684199-01, page 55.

CO₂ and CO from manual 7684199-01, page 55. Check against the data badge.

The combustion for this appliance has been checked, adjusted and preset at the factory for operation on the gas type specified on the appliance data plate. (page 42)

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

Covers: Ultra 12 System, Ultra 15 System, Ultra 18 System, Ultra 24 System, Ultra 28 System

GC 41-592-71, 41-592-72, 41-592-73, 41-592-74, 41-592-75

Enter Chimney Sweep Function / Force Max & Min Rate

1. Press the i P button and the + button together and hold for at least 6 seconds.
2. 'On' will be displayed briefly, followed by '304' then '100' when the boiler is lit, indicating the CH output is at MAXIMUM ('Chimney Sweep Function').
3. With the boiler operating in the maximum rate condition, check that the operational (working) gas pressure at the inlet gas pressure test point on the gas cock or valve is in accordance with B.S. 6798 & B.S. 6891 (AT LEAST 17mb, LPG - 37mb).
4. Ensure that this inlet pressure can be obtained with all other gas appliances in the property working.
5. Press the i P button and the + button together and hold for at least 6 seconds to exit the function.

From manual 7673139-01, page 29.

Enter Calibration Function

1. Ensure burner is not lit and case front panel is fitted.
2. Press the - button and the R button together for 6 seconds then quickly press the P button while 'On' is displayed.
3. The Ignition Phase fan speed code will then be displayed. Calibration will take approximately 5 minutes.
4. To exit the function press the R button. 'ESC' will be displayed.

From manual 7673139-01, page 40.

CO₂ and CO from manual 7673139-01, page 24, 40. Check against the data badge.

IMPORTANT: The combustion for this appliance has been checked, adjusted and preset at the factory for operation on the gas type specified on the appliance data plate. Do not adjust the air/gas ratio valve. (page 27)

Powermax HE 85, 115 & 150 Litre Condensing Boilers with Integrated Hot Water Storage

Covers: Powermax HE 115 Litre, Powermax HE 85 Litre

GC 41-389-15, 41-389-16

Check gas valve differential (offset) / Reduced Input Rate

1. Loosen screw in outlet pressure test point and connect to '+' (positive) side of differential micro-manometer.
2. Tee the '-' (negative) side of the micro-manometer into the air signal tube.
3. Switch on central heating using CH select button and switch off hot water. The boiler will re-start in CH mode after approx. 1 minute.
4. After boiler has been operating in CH mode for several minutes, simultaneously press the '+' and 'STEP' buttons and hold down for 5 to 6 seconds.
5. After a minute the boiler will be operating at low input and the differential can be checked.

From manual 5106226, page 26.

CO₂ and CO from manual 5106226, page 43. Check against the data badge.

Note: This valve has been factory pre-set and adjustment is not normally required. (page 26)

Promax HE Store Range

Covers: Promax HE Store 115 Litre, Promax HE Store 150 Litre, Promax HE Store 90 Litre

GC 41-591-76, 41-591-77, 41-601-24

Enter Calibration/Service Mode (Max & Min Rate)

1. Ensure that all external controls are calling for heat.
2. Turn both temperature control knobs fully anticlockwise, then quickly turn the right hand (or DHW) knob 1/4 clockwise twice and back fully anticlockwise.
3. The display will now alternate between 'SF' and the current boiler temperature and both green LEDs will flash.
4. To set to maximum rate: Turn the left hand (CH) temperature knob fully clockwise. The display will show '00', indicating maximum rate, then revert to 'P' alternating with the current boiler temperature.
5. To set to minimum rate: Turn the left hand (CH) temperature knob fully anti-clockwise. When the display reads ' 0' the boiler runs at minimum rate.
6. This function is maintained for 20 minutes unless the maximum CH temperature is exceeded. The function can be disabled at any time by turning the right hand knob.

From manual 5120008, page 37.

CO₂ and CO from manual 5120008, page 50. Check against the data badge.

The gas valve is factory set and the burner pressure changes as the fan modulates when demand on the boiler alters. (page 39)

Promax SL Heat ErP

Covers: Promax SL 12 Heat ErP, Promax SL 15 Heat ErP

GC 41-592-34, 41-592-35

Set Boiler to Maximum Rate

1. Ensure all external controls are calling for heat.
2. Ensure that the system is cold.
3. Ensure the boiler control knob is turned fully clockwise.
4. Allow the combustion to stabilise. Do not insert probe to avoid 'flooding' the analyser.

From manual 7647600, page 41.

Set Boiler to Low Rate

1. Set boiler to operate at a low rate.
2. If it is not possible to adjust the boiler to run at minimum rate using the boiler controls, the system must be set such that the boiler will modulate to as low an input as possible without the burner extinguishing (e.g. by closing radiator valves).
3. Allow the combustion to stabilise. Do not insert probe to avoid 'flooding' the analyser.
4. The gas rate must be checked & recorded whilst the boiler is operating in this condition.

From manual 7647600, page 41.

CO₂ and CO from manual 7647600, page 51. Check against the data badge.

The boiler is self-regulating dependent upon the system load. No adjustment of the gas valve is permissible. (page 40)

IMPORTANT: The combustion for this appliance has been checked, adjusted and preset at the factory for operation on the gas type specified on the appliance data plate. No measurement of the combustion is necessary. Do not adjust the air/gas ratio valve. (page 40)

Promax SL Range ( )

Covers: Promax 12 HE Plus, Promax 18 HE Plus

GC 41-591-79, 41-591-80

Entering Service / Firing the Boiler

1. Ensure both the gas and electrical supplies to the boiler are isolated before any work is started.
2. Remove the outercase and lower door panel.
3. Remove the top RH securing screw and hinge down the PCB housing to gain access to the gas service cock.
4. Turn the gas service cock anticlockwise to the ON position and check for gas soundness up to the gas valve.
5. Turn the flow temperature adjustment screw fully clockwise and run the system and check the boiler for correct operation.

From manual 5121908, page 37.

CO₂ and CO from manual 5121908, page 6. Check against the data badge.

No adjustment of the gas valve is permissible. (page 37)

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, Promax System 32 HE Plus

GC 41-591-90, 41-591-91, 41-591-92, 41-591-93, 41-601-21

Enter Calibration Mode (Service/Maximum & Minimum Rate Mode)

1. Ensure that all external controls are calling for heat and the selector switch is in the central heating and hot water position.
2. Turn both temperature control knobs fully anticlockwise.
3. Quickly turn the Calibration Control knob 1/4 clockwise twice and back fully anticlockwise.
4. The display will alternate between 'SF' and the current boiler temperature and both green LEDs will flash.
5. To force maximum rate: turn CH temperature control knob fully clockwise (display changes to '00' then 'P' alternating with current boiler temperature).
6. To force minimum rate: turn CH temperature control knob fully anticlockwise until display reads '0'.

From manual 5114442, page 33.

CO₂ and CO from manual 5114442, page 45. Check against the data badge.

The gas valve is factory set and the burner pressure cannot be measured as it is altered by suction of the fan and modulates as demand on the boiler alters. (page 33)

Puma 80, 80e & Saver

Covers: Puma 80e

GC 47-590-11

Adjusting the Central Heating Range Rate Pressure

1. Ensure all D.H.W outlets are turned off.
2. Ensure all radiator control valves are fully open and any room thermostats are calling for heat.
3. Set central heating temperature control knob to maximum (80 & 80e).
4. Set central heating switch to Constant. The burner will light but remain at low burner pressure for approximately 2 minutes before going to maximum pressure. Allow central heating to run for 5 or 10 minutes.
5. Using the range rate adjustment knob on the electronic control board adjust to the values for Range Rate in Table 4.

From manual 27/18810 - 03, page 20.

The gas pressures are set at the factory (with central heating output set at maximum) and should not require further adjustment. (page 21)

Suprima 30 - 80 HE Condensing Central Heating Boiler

Covers: Suprima 50 HE

GC 41-075-37

Entering Service Mode / Firing Boiler for Commissioning & Servicing

1. Turn the temperature control knob to the ( ) position. (symbol shown in the manual, see the page)
2. Ensure that the main electricity supply is 'On', the 'Mains On' (Green) light will flash.
3. Turn the boiler gas service cock to the 'On' position and ensure that the main gas supply is turned 'On'.
4. Check that the programmer and any other external controls, if fitted, are in an 'On' position and calling for heat.
5. Turn the temperature control knob to its maximum setting, the 'Burner On' (Green) light will flash and after several seconds, the burner will light automatically.
6. When the burner flame has established, the 'Burner On' (Green) light will be on and flames will be visible through the sight glass.

From manual 5112565, page 22.

Ultra Heat

Covers: Ultra 12 Heat, Ultra 15 Heat, Ultra 18 Heat, Ultra 21 Heat, Ultra 24 Heat

GC 41-592-56, 41-592-57, 41-592-58, 41-592-59, 41-592-60

Entering Service Mode (Chimney Sweep)

1. Press the Chimney Sweep button for 3 seconds to activate.
2. The boiler will go to min rate.
3. Pressing again will make it adjust to max rate.
4. To exit, press the RESET button for 3 seconds.

From manual 7684225-01, page 42.

CO₂ and CO from manual 7684225-01, page 54. Check against the data badge.

The combustion for this appliance has been checked, adjusted and preset at the factory. After replacing the Combustion Control Unit the CO2 must be checked and adjusted. (page 41)

Wall Mounted Fan Assisted Balanced Flue Gas System Boilers (Ultra 2 range)

Covers: Ultra 2 30 DV, Ultra 2 40DvP, Ultra 2 50, Ultra 2 60, Ultra 2 60Dv

GC 41-607-50, 41-607-51, 41-607-53, 41-607-57, 41-607-58, 41-607-65, 41-607-66, 41-607-68, 41-607-72, 41-607-73

Enter Test/Service Mode

1. A test switch is provided on the top of the control box which will allow the boiler to operate during commissioning without the programmer connected.
2. Set the test switch on the top of the control box to 1 (on) and check that all system controls are calling for heat.
3. Before the case is fitted this switch must be set to the O (off) position if a programmer is used.

From manual 405/0522 - 03, page 20.

Exit Test/Service Mode

1. Switch off the electricity supply to the boiler.
2. Set the test switch to O (off) if a programmer is used.

From manual 405/0522 - 03, page 21.

The Ultra 2 boilers are range ratable and are factory set to the maximum output. (page 97)