BoilerFaultCodesWhat the manual says
Manufacturer manualFan error
From this model's manual
Verified against the Vokera Condexa Pro installation & service manual, page 57.
What causes this fault?
This fault occurs when the boiler's internal computer detects that the fan is not spinning at the required speed to safely clear exhaust fumes. The most common reasons are a buildup of dirt or debris inside the fan casing, a mechanical failure of the motor, or a communication issue between the circuit board and 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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