BoilerFaultCodesYour boiler detects a flame when it should be turned off, which prevents it from starting up safely for its next cycle.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: Flame simulation (flame detected when control is in the off-position)
What causes this fault?
This fault occurs when the boiler's internal sensors detect a flame even though the gas should be turned off. It is usually caused by a gas valve that isn't closing fully, or a faulty sensor that is incorrectly reporting a flame when none exists. Because this is a safety conflict, the boiler will prevent itself from firing up to avoid a dangerous buildup of heat or gas.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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