BoilerFaultCodesYour boiler is detecting a flame when there shouldn't be one, leading to a safety lockout to prevent incorrect operation.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: Flame circuit / parasitic flame fault
What causes this fault?
This fault occurs when the boiler's internal sensors detect a flame after the burner should have switched off, or even before it has started. The most common reasons are a dirty or damaged sensing electrode sending a false signal, or a malfunction in the main control board that misinterprets electrical current as a live flame.
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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A boiler cover plan would cover faults like E35 — no call-out fees, no surprises.
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