Potterton
Fault Codes

Listed below are the common Potterton fault codes as described by the boiler manufacturer along with a possible cause.

Promax Combi, System, and Store Error Codes

Fault CodePossible 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 CodePossible Cause
E10 Outdoor sensor error
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 CodePossible 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

Potterton Error Code E133

If you are seeing the error code E133 on your Potterton boiler, this means that your boiler condensate pipe is frozen. A frozen condensate pipe is something that can be fixed quite easily yourself if you feel confident enough. There are a few ways you can thaw a pipe out yourself without having to call an engineer.

 


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