BoilerFaultCodesTechnical description
Flame detected without gas valve opening
What causes this fault?
This fault occurs when the boiler's internal sensors detect a flame signal at a time when the burner should be off. The most common reason is a malfunctioning ionisation electrode that is sending a false signal, or a fault within the main control board that is misinterpreting electrical interference as a flame. It can also be caused by moisture or carbon deposits building up on the ignition components, creating a 'leak' of electricity.
Engineer required
This is a high severity fault. Stop using the boiler and call a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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