BoilerFaultCodesYour boiler is correctly sensing a flame when it expects the burner to be extinguished, which is typically caused by a faulty internal sensor or a gas valve that isn't closing properly.
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 signal present while burner should be off: check gas valve and ionisation probe.
What causes this fault?
This fault occurs when the boiler’s control system detects a flame inside the unit even though it has commanded the heating to stop. The most common reason is a gas valve that is stuck open and leaking fuel into the burner, or a faulty internal sensor that is incorrectly reporting a flame signal. Because the boiler cannot safely extinguish the heat, it shuts down entirely to prevent overheating or gas build-up.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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A boiler cover plan would cover faults like E36 — no call-out fees, no surprises.
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