6 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 is struggling to move water through its system, which means it has safely shut itself down to prevent overheating.
Your boiler is unable to start up safely because the internal fan, which clears waste gases, is not spinning correctly or communicating with the control board.
Your boiler has detected a problem with the temperature sensor that controls your central heating, meaning it may not be able to warm your radiators correctly.
Your boiler has detected that water is not circulating correctly through the system, which has likely caused it to shut down to prevent overheating.
Your boiler has shut down because it or the flue has become too hot, and it has locked out for safety reasons.
Your boiler has failed to light the gas to create heat and has safely shut itself down to prevent a problem.
Not faults — these are normal operating states. Tap to expand.
BoilerFaultCodes