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 your heating system, which means it has stopped heating your home or water to prevent damage.
Your boiler has stopped working because the internal fan, which safely clears exhaust fumes, is not starting or running correctly.
Your boiler has detected an issue with the sensor that monitors the temperature of the water circulating through your radiators.
Your boiler has stopped because its internal safety sensors have detected that water is either not moving through the system or is becoming too hot.
Your boiler has switched itself off because it has detected that it is getting too hot or there is a problem with the flue gases.
Your boiler has failed to light the gas and has locked itself out for safety.
Not faults — these are normal operating states. Tap to expand.
BoilerFaultCodes