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 is struggling to accurately measure the temperature of your hot water, which usually results in the water not heating up at all.
Your boiler has paused temporarily because it has detected a minor issue, most likely low water pressure or a brief interruption in the airflow.
Your boiler has detected a safety-related issue with its internal airflow or pressure, causing it to lock down for protection.
Your boiler has detected a faulty internal temperature sensor, causing it to shut down as a safety precaution.
Your boiler has detected a problem with the sensor that measures hot water temperature, which may prevent your taps from getting hot.
Not faults — these are normal operating states. Tap to expand.
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BoilerFaultCodes