BoilerFaultCodesWhat the manual says
Manufacturer manualInsufficient fan speed for ignition
What causes this fault?
This fault occurs when the boiler's control system detects that the fan is not reaching the required speed to safely vent exhaust gases. The most common reasons are a build-up of debris within the fan assembly, a failing motor, or a blockage in the small plastic tubes that monitor air pressure. Without the fan spinning at full strength, the boiler will refuse to ignite as a safety precaution.
This fault is slightly more common in autumn and winter, as spiders or debris can block the pressure sensing tubes during periods of high wind or inactivity.
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.
Avoid the next call-out bill
A cover plan would handle faults like b 65: no call-out fees, no surprise bills.
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