BoilerFaultCodesYour boiler has detected a problem with the fan that clears exhaust gases, preventing it from starting safely for heating or hot water.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: Problem with fan, possibly no signal
What causes this fault?
This fault occurs when the boiler's control board sends a command for the fan to spin but does not receive the necessary speed signal back to confirm it is running safely. The most common reasons are a mechanical failure of the fan motor, loose electrical connections between the internal components, or a faulty circuit board that can no longer process data.
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 05E — no call-out fees, no surprises.
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