BoilerFaultCodesYour boiler detects a flame when it should be turned off, which prevents the system from starting up safely.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: Flame signal present with burner off
What causes this fault?
This fault occurs when the boiler's sensors detect a flame signal even though the burner should be currently switched off. The most common cause is a faulty ionisation electrode sending a false signal to the computer, or a gas valve that is failing to close fully and allowing a small amount of fuel to continue burning.
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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Parts for discontinued models can be hard to find and expensive. A new A-rated boiler could save you money on both repairs and energy bills.
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