16 fault codes with plain-English explanations, severity ratings, DIY guidance, and repair cost estimates.
Replaced by: Potterton Promax HE
This boiler uses LED flash patterns
Count the flashes in one repeating group before the pause. That number is your fault code. Do not reset until you have noted it. How to read fault codes →
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Your boiler has likely detected it is getting too hot or a temperature sensor has stopped working correctly, causing it to shut down for safety.
Your boiler has become too hot and has switched itself off as a safety precaution to prevent damage.
Your boiler has temporarily lost its flame and is attempting to restart itself automatically.
Your boiler is failing to light its burner and has locked itself out for safety after several unsuccessful attempts.
Your boiler has experienced a brief digital communication glitch and is currently trying to fix itself automatically.
Your boiler has detected that the internal fan is not spinning correctly, which means it cannot safely blow away exhaust gases to start the heating process.
Your boiler is experiencing a temporary computer glitch and is trying to correct itself automatically.
Your boiler's internal memory chip has developed a communication fault or failed, meaning the unit cannot store its settings and won't fire up.
Your boiler has encountered a minor glitch and is currently pausing itself to try and fix the problem automatically.
Your boiler has encountered a general electronic or communication error and has stopped working for safety.
Your boiler has too much water inside its system, which is causing it to shut down for safety.
Your boiler is not moving water through the system correctly, which is causing it to shut down to prevent overheating.
Your boiler has detected that its built-in fan is not spinning at the right speed or has stopped entirely, preventing it from safely clearing away exhaust fumes.
Your boiler is having trouble breathing correctly and cannot safely move air or waste gases through the system.
Your boiler has detected that it is heating up very quickly without enough water flowing through it, meaning it is at risk of overheating.
Your boiler has stopped working because it has detected a fault and shut itself down for safety.
Not faults — these are normal operating states. Tap to expand.
BoilerFaultCodes