Your boiler has stopped working because the internal fan, which safely clears waste gases, is spinning at the wrong speed.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: Fan speed Fan speed incorrect
What causes this fault?
This fault occurs when the boiler's control system detects that the fan is not spinning at the required speed to safely vent exhaust gases outside. The most common reasons are a build-up of dirt or debris within the fan's bearings, a loose electrical connection, or a component failure on the main circuit board.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
Find a Gas Safe engineer
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