BoilerFaultCodesYour boiler has detected an issue with how it clears exhaust fumes, preventing it from firing up for safety.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: Fault on Fan or Flue
What causes this fault?
This fault occurs when the boiler's internal safety sensors detect that the fan isn't moving enough air to safely clear exhaust gases from the system. The most common reasons are a mechanical failure of the fan motor, a blockage in the flue pipe, or a split in the small rubber tubes that monitor air pressure.
This fault can occasionally occur during periods of high winds, as strong gusts blowing directly into the flue terminal can temporarily disrupt the airflow required for the boiler to start.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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Search the official register for a qualified engineer in your area.
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