Potterton Boiler Fault & Error Codes

Boilers are like cars, a problem could occur when you least expect it for no apparent reason. Potterton boilers are no different.

Part of the Baxi family, these boilers are few and far between these days but they are still powering homes in the UK

The fault codes you will see on a Potterton boiler are a letter and a number, they are designed to show up on your boiler display so you can go check on the Potterton website or the table below and see if it is a problem you can solve.

If the fault code shows an error which you cannot solve, contact a Gas Safe registered engineer as soon as possible.

Potterton Boiler Fault Code Table:

If you’ve got an error code on a Potterton boiler then it should be in our list. Most of the best combi boilers in the UK will show an error at some point in their lifetime. 

If you have an old boiler, you may want to consider the fact it may be time to upgrade to a new A-rated combi boiler to help keep running costs down. You can get a fixed price for a boiler online on all the best combis, system boilers and regular boilers in the UK

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.

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.

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.

If you need any more assistance check out the Potterton website now.