Your boiler has shut down because the internal fan, which safely clears waste gases, has stopped spinning while the boiler was running.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: Fan has stopped during appliance operation
What causes this fault?
This fault occurs when the boiler's control system loses the signal that the fan is spinning, causing the unit to shut down for safety. The most common reason is that the fan motor has burnt out or become physically seized, though it can also be caused by a communication failure where the circuit board can no longer send power to the fan.
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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