BoilerFaultCodesYour boiler thinks it sees a flame even though the gas supply should be turned off, which is a safety conflict that prevents the system from starting.
Turn off your boiler and stop using gas appliances. Call a Gas Safe engineer now — this fault can be dangerous if ignored.
Technical description: Flame detected when gas valve off
What causes this fault?
This fault occurs when the boiler's internal sensors detect a flame after the heating cycle has ended and the gas should be cut off. The most common reason is a gas valve that is physically stuck open or leaking, though it can also be caused by an electrical 'ghost' signal from a damaged sensor or a faulty control board.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
Find a Gas Safe engineer
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