BoilerFaultCodesYour boiler has stopped working because it cannot safely clear waste gases through the ventilation pipe.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: Fan or flue pressure switch failure
What causes this fault?
This fault occurs when the boiler's safety sensors detect that the fan isn't moving enough air to safely vent exhaust gases out of the building. The most common reason is a mechanical failure of the fan motor or a blockage in the small plastic tubes that monitor air pressure. Without a clear path for waste gases to escape, the boiler automatically shuts down to prevent dangerous fumes from entering your home.
This issue can be more frequent during very windy weather, as strong gusts can sometimes create back-pressure in the flue that interferes with the pressure switch readings.
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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