BoilerFaultCodesTechnical description
Fan speed too high
What causes this fault?
This fault occurs when the boiler's internal safety checks detect that the fan isn't spinning fast enough to safely push exhaust fumes out of the flue. The most common reason is a mechanical failure within the fan motor or a buildup of debris that prevents it from turning freely.
This fault is slightly more frequent during windy winter periods, as strong gusts can sometimes create back-pressure in the flue that puts extra strain on a failing fan motor.
Engineer required
This is a high severity fault. Stop using the boiler and call a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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