Potterton Boiler Issues: Errors and Fault Codes

When your Potterton boiler develops a fault, an error code or fault code should appear on your boiler display. These fault codes are designed to make it easy for your engineer to diagnose and fix issues with your Potterton boiler, so make sure you tell your engineer the fault code when you contact them to arrange a repair. You may be able to clear the fault yourself if it’s something really simple like resetting the boiler but the majority of faults will need to be sorted out by a qualified heating engineer.

If a fault code has appeared on your Potterton boiler, take a look at the tables below to find out what the code means.

Potterton Assure Combi Boiler Fault Codes

FAULT CODE DESCRIPTION / POSSIBLE CAUSE
E09 Gas valve connection cable.
E10 External probe fault.
E12 Differential water flow switch fault (still open).
E13 Differential water flow switch fault (still closed).
E15 Gas valve command fault.
E20 Central heating NTC fault.
E28 Flue NTC fault.
E40 Central heating return NTC fault.
E50 Domestic hot water (DHW) NTC sensor fault (tank boiler) (s.c.) or DHW NTC sensor fault (tank boiler) (o.c.).
E83, E84, E85, E86 or E87 No communication.
E190 Pre-circulation fault.
E110 Boiler max temperature exceeded for gradient (could be a jammed pump or air in the circuit) or boiler maximum temperature exceeded for overtemperature (could be jammed pump or air in the circuit) or the safety thermostat has tripped.
E118 Primary system water pressure is too low.
E125 Circulation fault (primary).
E128 Frequent flame failure – 12 times.
E129 Safety error for frequent loss of flame with maximum correction during the ignition during calibration function.
E130 Flue thermostat sensor has tripped (lockout).
E133 Failure to light (could be an issue with gas supply). Check that the gas supply is available by lighting your gas fire or cooker.
E134 Elapsed time gas valve open without gas (short request in a short period).
E135 Interruption of gas supply (internal error).
E154 Flow/return sensor temperature test.
E160 Fault with fan or fan wiring.
E163 Domestic hot water (DHW) NTC sensor fault (s.c.) or DHW NTC sensor fault (o.c.).
E270 Circulation fault (dry fire).
E317 Wrong power supply electrical frequency (Hz).
E321 Hot water NTC fault.
E384 False flame.
E385 Under voltage.
E430 Water pressure temporary test.
E430 + flame crossed Water pressure test failed.

 Potterton Promax Ultra Boiler Fault Codes

FAULT CODE DESCRIPTION / 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, E84, E85, E86 or E87 No communication between boiler and room controller.
E92 Combustion test alarm during auto-setting.
E109 Poor circulation.
E110 Boiler overheat has tripped.
E117 System pressure too high.
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 has tripped (lockout).
E133 Ignition fault.
E135 Internal error.
E154 Primary flow fault.
E160 Fault with fan.
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 Promax Combi, System and Store Boiler Fault Codes

FAULT CODE DESCRIPTION / 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 has tripped.
E119 System pressure too low.
E125 Primary water circulation fault.
E130 Flue thermistor sensor has tripped (lockout).
E131 Flue overheat lockout.
E133 Ignition fault.
E151 or E152 PCB error.
E160 or E161 Fault with fan.
E164 Domestic hot water sensor error (UK) or heating flow switch error (ROI).
E167 PCB fault.
E168 PCB lockout.
E193 Circulation error.

Potterton Gold Combi, Gold System and Titanium Combi Boiler Fault Codes

FAULT CODE DESCRIPTION / 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, E84, E85, E86 or E87 No communication between boiler and room controller.
E92 Combustion test alarm during auto-setting.
E109 Poor circulation.
E110 Boiler overheat has tripped.
E117 System pressure too high.
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 has tripped (lockout).
E133 Ignition fault.
E135 Internal error.
E154 Primary flow fault.
E160 Fault with fan.
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.