Select a fault code
The boiler has failed to ignite after the maximum number of attempts. This is commonly caused by low gas pressure, a faulty ignition electrode, or a blocked condensate pipe.
The flame went out unexpectedly during a heating or hot water cycle.
The boiler has overheated and the safety thermostat has activated. This is caused by poor circulation, a blocked heat exchanger, or a pump failure.
The flue gas temperature sensor has failed or is reading outside normal parameters.
The flow temperature has exceeded the safe operating limit. Poor circulation or a failing pump is often the cause.
The fan is not operating at the correct speed. Combustion gases cannot be safely expelled.
Flame detected when burner should be off. Serious gas valve or ionisation fault.
A fault has been detected on the ignition circuit board.
The flow temperature sensor (NTC thermistor) has failed or is reading incorrectly.
The return temperature sensor has failed or is reading incorrectly.
The flue temperature sensor has failed.
The air pressure switch has not confirmed fan operation.
A fault has been detected on the gas valve.
System water pressure has dropped below the minimum operating level.
An internal fault on the main circuit board.
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