Potterton Boiler Error Codes
Potterton Promax Ultra, Gold/Titanium Combi & System Boiler Error Codes
Fault Code
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
127
Legionella (cause of Legionnaires’ disease) protection temperature not reached
128
Loss of flame during operation
133
Safety time to establish flame exceeded
153
Forced reset unit unlocked
160
Fan fault
162
Air pressure switch error
164
Pressure Sensor Error (UK) – Heating flow switch error (Ireland)
166
Air pressure switch fault
270
Dry fire
432
Earth connector error
433
Heat exchanger temperature exceeded (greater than 95 degrees)
Potterton Promax Ultra, Gold/Titanium Combi & System Boiler Error Codes
Fault Code
Possible Cause
E10
Outdoor sensor error
E09
Gas valve wiring fault
E10
Outdoor sensor error
E15
Gas valve connection fault
E20
Central heating thermistor sensor faul
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 Code
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
E160E317
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