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Potterton Boiler Fault Codes and Errors
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The good thing about modern boilers is that they have a way of telling you when they have an internal error. As such, when your Potterton boiler has an issue, it will inform you of the same via an error code displayed on the boiler display panel.
As these fault codes are meant to be understood by the boiler engineer fixing the issue, you may have a hard time making sense of the displayed error codes. However, by referencing this article, you will be able to identify the problem with your boiler. And if it is a simple one, you can even resolve it on your own without having to call in a heating engineer.
Potterton Promax Combi, System, and Store Boiler Error Codes
| Error
Code |
Possible Cause |
| E10 | An outdoor sensor error |
| E20 | Faulty central heating sensor thermistor |
| E28 | Faulty flue thermistor |
| E50 | Faulty DHW sensor |
| E110 | The boiler overheat has tripped |
| E119 | There is low water pressure in the boiler system |
| E125 | There is a fault with primary water circulation |
| E130 | Boiler lockout due to a tripped flue thermostat sensor |
| E131 | Boiler lockout due to flue overheating |
| E133 | Ignition failure due to faulty detection electrodes or gas supply issues |
| E151 & E151 | PCB error |
| E160 & E161 | Faulty fan |
| E164 | A DHW sensor error or a heating flow switch error |
| E167 | PCB error |
| E168 | Boiler lockout due to a PCB fault |
| E193 | Faulty circulation in the boiler system |
Potterton Assure Combi and System Boiler Error Codes
| Fault
Code |
Possible Cause |
| E09 | Defective or short-circuited gas valve connection cable |
| E10 | Faulty external probe |
| E12 | The differential water flow switch is still open when it should be closed |
| E13 | The differential water flow switch is still closed when it should be open |
| E15 | Gas valve command error due to faulty connection or a defective gas valve |
| E20 | Faulty central heating negative temperature coefficient (NTC) |
| E28 | Faulty flue negative temperature coefficient (NTC) |
| E40 | Faulty central heating negative temperature coefficient (NTC) |
| E50 | DHW NTC sensor fault (tank boiler) (s.c) or DHW NTC sensor fault (tank boiler) (o.c) |
| E83/E84/E85/E86/E87 | Communication error between the boiler and the room controller |
| E109 | Pre-circulation error |
| E110 | The temperature in the boiler has exceeded tolerable limits, usually caused by a faulty pump, the presence of air in the boiler system, or a tripped safety thermostat sensor. |
| E118 | The water pressure in the primary system is too low |
| E125 | There is a primary circulation error |
| E128 | A flame failure has occurred 12 consecutive times |
| E129 | A safety error due to frequent flame loss |
| E130 | Boiler lockout due to a tripped thermostat sensor |
| E133 | Ignition failure due to a possible gas supply issue |
| E134 | Elapsed time gas valve open, but there is no gas supply |
| E135 | Internal error due to interrupted gas supply |
| E154 | Flow/return sensor test underway |
| E160 | Fan issues due to it being defective or having faulty wiring |
| E163 | DHW NTC sensor fault (tank boiler) (s.c) or DHW NTC sensor fault (tank boiler) (o.c) |
| E270 | Circulation fault resulting in a dry fire |
| E317 | Incorrect power supply frequency |
| E321 | Faulty hot water NTC |
| E384 | False flame detected |
| E385 | Under voltage due to power supply to the boiler being less than 195 V |
| E430 | Temporary water pressure test underway |
| E430 + FLAME CROSSED | The water pressure test failed |
Potterton Promax Ultra, Gold/Titanium Combi &System Boiler Error Codes
| Fault
Code |
Possible Cause |
| E09 | Faulty gas valve due to wiring issues |
| E10 | There is an outside sensor error |
| E15 | Gas valve connection fault |
| E20 | Faulty central heating sensor |
| E28 | Faulty flue thermistor |
| E40 | Faulty central heating return sensor |
| E50 | Faulty domestic hot water (DHW) sensor |
| E53 | The gas flue is obstructed |
| E55 | The boiler requires the self-calibration feature to be activated |
| E78 | The water pressure sensor is faulty |
| E83/E84/E85/E86/E87 | There is a communication error between the boiler PCB and the room controller. |
| E92 | The combustion test alarm was activated during auto-setting |
| E109 | Poor water circulation in the boiler system |
| E110 | Boiler lockout due to tripped boiler overheat |
| E117 | The water pressure in the boiler system is too high |
| E118 | The water pressure in the boiler system is too low |
| E125 | Primary water circulation fault |
| E128 | The flame was lost during boiler operation |
| E129 | The flame was lost during calibration |
| E130 | Boiler lockout due to tripped flue thermostat sensor |
| E133 | Ignition failure due to faulty detection electrodes or gas supply issues |
| E135 | Internal PCB error |
| E154 | Incorrect primary flow in the boiler |
| E160 | Faulty fan due to it being defective, blocked or short-circuited |
| E270 | Circulation fault resulting in a dry fire |
| E317 | Incorrect power supply frequency to the boiler |
| E321 | Faulty hot water thermistor |
| E384 | A flame was detected despite the gas valve being off |
| E385 | The mains power supply to the boiler is less than 195V. |