Select a fault code
The boiler has failed to ignite. Common causes include low gas pressure or a faulty ignition electrode.
The flame went out during normal operation.
The thermal cut-off safety device has operated.
The boiler has overheated and the safety thermostat has cut it out.
The fan or flue system is not operating correctly.
The flow temperature sensor has failed.
The return temperature sensor has failed.
Main circuit board fault detected.
Flame detected when burner should be off.
System pressure has dropped below the minimum level.
The boiler has locked out due to overheating.
The condensate drain is blocked or frozen.
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