11 fault codes with plain-English explanations, severity ratings, DIY guidance, and repair cost estimates.
Replaced by: Solo HE
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 stopped working because the internal fan, which safely clears waste gases, is unable to start or spin correctly.
Your boiler is not receiving enough electrical power from the main supply to operate safely.
Your boiler has got too hot and has shut itself down for safety, which is why your heating and hot water have stopped working.
Your boiler has detected an internal communication problem between its electronic components, meaning it cannot operate safely and has shut down.
Your boiler's internal computer has failed and can no longer control the heating system safely.
Your boiler is overheating because water isn't moving through the system properly or there isn't enough water inside.
Your boiler has detected a problem with its internal temperature sensor, meaning it cannot accurately tell how hot the water is and has shut down as a safety precaution.
Your boiler has detected that the electrical wiring coming into the unit is connected backwards, which is a safety risk and prevents the system from starting.
Your boiler's main control board has suffered an internal electronic failure and requires a professional replacement.
Your boiler is failing to light the gas burner properly and has shut down as a safety precaution.
Your boiler is not receiving the signal to turn on, which usually means your external heating controls like the thermostat or programmer are not calling for heat.
BoilerFaultCodes