BoilerFaultCodesYour boiler has detected an issue with the fan that clears exhaust fumes, preventing the system from starting for your safety.
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 Fan Wiring Fault
What causes this fault?
This fault occurs when the boiler's control board fails to receive a signal that the fan is spinning at the correct speed to safely expel exhaust gases. The most common reason is that the fan motor has seized or its internal electronics have burnt out, though loose or damaged wiring can also interrupt this vital communication. Without a functioning fan, the boiler automatically shuts down to prevent dangerous fumes from building up inside the unit.
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.
Gas Safe Register →Protect yourself from future repair bills
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