BoilerFaultCodes.com
FA Emergency Lockout

Your boiler is still sensing a flame even though it has tried to turn the gas off, which is a safety conflict that requires a professional inspection.

Act immediately

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 after gas shut off

What causes this fault?

This fault occurs when the boiler's internal sensors continue to detect heat or a flame signal even after the burner should have shut down. The most common reasons are a gas valve that is failing to close fully, or a faulty sensor that is incorrectly reporting a flame to the control board.

Typical repair cost £180-450 (including labour)

Engineer required

This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

Find a Gas Safe engineer

Search the official register for a qualified engineer in your area.

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Protect yourself from future repair bills

A boiler cover plan would cover faults like FA — no call-out fees, no surprises.

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