BoilerFaultCodesYour boiler thinks it sees a flame even though it hasn't started the burner yet, which is a safety conflict that prevents it from running.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: Flame detected with the burner off – electrode defective main board defective
What causes this fault?
This fault occurs when the boiler's internal sensor detects an electrical signal mimicking a flame before the heating cycle has actually started. This is usually caused by a carbon-coated or damaged electrode sending a 'false' signal, or moisture and debris on the burner assembly interfering with the detection system.
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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A boiler cover plan would cover faults like A02 — no call-out fees, no surprises.
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