If you own a Potterton boiler, you know that maintaining it is essential for keeping your home warm and comfortable. But sometimes your boiler may experience a problem and display an error code. Different Potterton boiler models may display different error codes, which can be confusing. To help you understand these codes and troubleshoot your Potterton boiler, this blog post will provide a comprehensive list of Potterton boiler error codes and their causes. If you need further assistance, consider our gas boiler repairs in London.
Promax Combi, System, and Store Error Codes
| Fault codes | Possible Cause |
| E10 | Outdoor sensor error |
| E20 | Central heating thermistor sensor fault |
| E28 | Flue thermistor fault |
| E50 | Domestic hot water sensor fault |
| E110 | Boiler overheat tripped |
| E119 | System pressure too low |
| E125 | Primary water circulation fault |
| E130 | Flue thermostat sensor tripped (lockout) |
| E131 | Flue overheat lockout |
| E133 | Ignition fault |
| E151 | Printed circuit board (PCB) error |
| E152 | PCB error |
| E160 | Fan fault |
| E161 | Fan fault |
| E164 | Domestic hot water sensor error – could be a heating flow switch error) |
| E167 | Printed circuit board (PCB) fault |
| E168 | Printed circuit board (PCB) lockout |
| E193 | Circulation |
Potterton Promax Ultra, Gold/Titanium Combi & System Boiler Error Codes
| Fault codes | Possible Cause |
| E09 | Gas valve wiring fault |
| E10 | Outdoor sensor error |
| E15 | Gas valve connection fault |
| E20 | Central heating thermistor sensor fault |
| E28 | Flue thermistor fault |
| E40 | Central heating return thermistor fault |
| E50 | Domestic hot water sensor fault |
| E53 | Flue obstruction |
| E55 | Calibration required |
| E78 | Water pressure sensor fault |
| E83 / 84 / 85 / 86 / 87 | No communication between room controller and boiler |
| E92 | Combustion test alarm during auto-setting |
| E109 | Poor circulation |
| E110 | Boiler overheat tripped |
| E117 | System pressure too high (>2.9 bar) |
| E118 | System pressure too low |
| E125 | Primary water circulation fault |
| E128 | Loss of flame during operation |
| E129 | Loss of flame during calibration |
| E130 | Flue thermostat sensor tripped (lockout) |
| E133 | Ignition fault |
| E135 | Internal error |
| E154 | Primary flow fault |
| E160 | Fan fault |
| E270 | Dry fire |
| E317 | Wrong power supply (HZ) |
| E321 | Hot water thermistor fault |
| E384 | Flame detected when gas valve off (false flame) |
| E385 | Low voltage (less than 195v) |
Potterton Assure Combi and system Boiler Error Codes
| Fault codes | Possible Cause |
| E09 | Gas valve connection cable fault |
| E10 | External probe fault |
| E12 | Differential water flow switch is still open |
| E13 | Differential water flow switch is still closed |
| E15 | Fault with the gas valve command |
| E20 | Central heating negative temperature coefficient (NTC) fault |
| E28 | Flue negative temperature coefficient (NTC) fault |
| E40 | Central heating return negative temperature coefficient (NTC) fault |
| E50 | Domestic hot water (DHW) negative temperature coefficient (NTC) sensor (tank boiler) (s.c) or DHW NTC sensor (tank boiler) (o.c.) Fault |
| E83 / E84 / E85 / E86 / E87 | Communication error |
| E109 | Pre-circulation fault |
| E110 | Boiler Max temperature exceeded for gradient (or overtemperature) Probable pump jammed or air in the circuit or Safety thermostat sensor tripped |
| E118 | Primary system water pressure too low |
| E125 | Primary circulation fault |
| E128 | Flame failure (12 times) |
| E129 | Frequent loss of flame (safety error) |
| E130 | Flue thermostat sensor tripped and locked out |
| E133 | Possible gas supply issue (failure to light) |
| E134 | Elapsed time gas valve open without gas |
| E135 | Internal error (interruption of gas supply) |
| E154 | Flow/return sensor temperature test |
| E160 | Problem with fan (possible wiring fault) |
| E163 | Domestic hot water (DHW) negative temperature coefficient (NTC) sensor fault (s.c.) or DHW NTC sensor fault (o.c.) |
| E270 | Dry fire |
| E317 | Wrong power supply (HZ) |
| E321 | Hot water fault |
| E384 | False flame |
| E385 | Under voltage |
| E430 | Water pressure test |
| E430 + Flame crossed | Water pressure test failed |
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