2023 Potterton Boiler Error & Fault Codes
Potterton boilers are renowned for their reliability, and this has been a key factor in making them one of the most popular boiler types in the UK. However, like any other machinery they do occasionally encounter some minor mechanical faults that can cause problems in operation.
If you're not a heating engineer, then Potterton boiler error codes can be difficult to understand. However, it's essential to know what they mean if you want to fix them on your own, and improve your home's energy efficiency in the process.
On this page, we've listed all the fault codes and error messages that Potterton boilers can display. This will help you to diagnose any problems that occur, and to fix them. The list contains every error message on the Potterton diagnostic display, even though many of them are so common they hardly ever appear (for example, "no heat" or "heating on").
Potterton Assure Combi and System Boiler Error Codes
Error codes on Potterton Assure Combi and System boilers may appear in the form of flashing and pulsing red lights on the boiler front display, or on your programmer and/or programmer LED display.
This table aims to help the homeowner understand how to troubleshoot combi boilers that display an error code. The information provided here will also apply to system boilers.
| 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 |
| 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 |
Promax Combi, System, and Store Boiler Error Codes
You get an error code on the LCD when something is wrong with your boiler. What could the code mean? Here is a list of common Potterton Promax boiler error codes.
This list of Potterton Promax boiler error codes are an essential resource if you're boiler is displaying a fault condition. Error codes are often displayed as the boiler stops working. They can help you find out what component or component has failed and prevent further damage to this part.
| 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 |
Potterton Promax Ultra, Gold/Titanium Combi & System Boiler Error Codes
Potterton Promax Ultra boilers have error codes like other boilers and its LED display panel operates in the same way.
Potterton boilers use error codes to help technicians to identify problems. When a fault occurs on the Promax Ultra, Gold/Titanium combi & system boilers the error code will flash up on the display and also be stored in memory for about 6 hours or so.
| 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 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) |
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