5 fault codes with plain-English explanations, severity ratings, DIY guidance, and repair cost estimates.
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 stopped working because the internal fan, which safely exhausts gases, is not starting or running correctly.
Your boiler has detected a problem with the temperature sensor that manages your central heating, meaning it cannot accurately monitor the water temperature.
Your boiler has detected that water is not circulating correctly or is getting too hot, so it has shut down to prevent damage.
Your boiler has shut down because it has detected an unsafe level of heat or a problem with how waste gases are being vented.
Your boiler has stopped working because it cannot detect a flame, likely due to a temporary interruption in the gas supply or a part that needs cleaning.
Not faults — these are normal operating states. Tap to expand.
BoilerFaultCodes