9 fault codes with plain-English explanations, severity ratings, DIY guidance, and repair cost estimates.
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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 power but isn't starting up, which usually indicates an internal electrical issue or a loose connection.
Your boiler has stopped working because the internal computer has detected a general error and needs to be restarted.
Your boiler has detected a problem with the temperature sensor for your central heating, which means it cannot accurately tell how hot the water is.
Your boiler's hot water sensor has failed, meaning the system cannot accurately measure how hot your water is and has stopped heating it for safety.
Your boiler has paused because it has detected a minor temporary issue, likely linked to low water pressure or a small internal communication hiccup.
Your boiler has entered a safety lockout mode, meaning it has stopped working completely to protect the internal components.
Your boiler has detected a safety-related issue with its internal airflow or pressure systems and has shut down as a precaution.
Your boiler's main temperature sensor has failed or become disconnected, preventing the system from heating up as a safety precaution.
Your boiler has detected a problem with the temperature sensor that controls your hot water, meaning you likely have no hot water or the temperature is inconsistent.
Not faults — these are normal operating states. Tap to expand.
BoilerFaultCodes