Fan Fault
The boiler fan is not operating correctly — it may not be running, running too slowly, or the fan speed sensor has failed.
Step-by-Step Fix Guide
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Step 1
Do not attempt fan repairs yourself
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Step 2
Turn off the boiler
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Step 3 Engineer only
A Gas Safe engineer must inspect and test the fan motor and associated wiring
Work on gas appliances must be carried out by a Gas Safe registered engineer. The steps above cover safe checks a homeowner can perform - any internal component replacement requires a qualified professional. If in doubt, always call an engineer.