BoilerFaultCodesYour boiler thinks it sees a flame even when it hasn't started the burner yet, which is a safety conflict that prevents it from firing up.
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.
What causes this fault?
This fault occurs when the boiler's sensors detect an electrical current and assume a flame is present before the gas has even been ignited. This is usually caused by a faulty ionisation electrode sending a false signal or moisture and carbon build-up creating an electrical 'leak' back to the control board. For safety, the system refuses to start the ignition sequence to prevent gas from entering a chamber it believes is already lit.
This fault is more common during periods of high humidity or heavy rainfall, as moisture ingress can affect the electrical sensitivity of the ignition components.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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