9 fault codes with plain-English explanations, severity ratings, DIY guidance, and repair cost estimates.
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Your boiler has stopped working because a protective electrical fuse on its internal brain board has blown, cutting off power to the system's control components.
Your boiler has stopped working because a protective electrical fuse inside the control unit has blown, cutting off power to key components.
Your boiler is not receiving any electricity, which means it has completely shut down and cannot heat your home or water.
Your boiler has stopped working because a safety switch has detected that the unit became too hot and triggered a shutdown.
Your boiler has stopped working because a safety sensor has tripped, likely due to the system getting too hot.
Your boiler has detected an issue with its internal air supply system, which is preventing it from safely starting up the burner.
Your boiler is failing to detect the airflow needed for safe operation, likely due to an internal electrical connection issue or a faulty main control board.
Your boiler has stopped working because it cannot detect or signal that it is ready to fire up, likely due to an internal electrical communication fault.
Your boiler's control system is failing to send the necessary electrical signal to the gas valve, meaning the boiler cannot ignite to provide heating or hot water.
Not faults — these are normal operating states. Tap to expand.
BoilerFaultCodes