BoilerFaultCodesWhat the manual says
Manufacturer manualFan or Fan Wiring Fault
Shared across the Promax range
This code is shared by the boilers in this range, which use the same control board. It may not be printed in this exact variant’s manual.
What causes this fault?
This fault occurs when the boiler's internal computer detects that the fan is not spinning at the correct speed to safely expel exhaust gases. The most common reasons are a mechanical failure of the fan motor, loose electrical connections, or a fault on the main control board that prevents it from sending power to the fan.
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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Related fault codes
All 21 fault codes on the Promax HE Store
Seeing a different code? Every code this model can display, in one place.