Select a fault code
The boiler has failed to ignite after the maximum number of attempts. Common causes include low gas pressure or a faulty ignition electrode.
A problem with the flame detection circuit. The ionisation electrode may be dirty or damaged.
A flame is being detected when the burner should be off. This indicates a gas valve or ionisation fault.
The boiler has overheated and the safety thermostat has cut it out.
The fan is not operating at the correct speed. Safe combustion is not possible.
The boiler flow temperature has exceeded the safe operating limit.
The overheat thermostat has detected a fault or the boiler has reached dangerous temperatures.
The flow temperature sensor has failed or is reading an incorrect temperature.
The return temperature sensor has failed.
The system water pressure has dropped below the minimum operating level.
The pump is not operating correctly.
A fault has been detected on the gas valve.
An internal fault on the boiler's main circuit board.
The condensate drain is blocked or the condensate pump has failed.
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