BoilerFaultCodesTechnical description
Incorrect signal from fan
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 waste gases. It is usually caused by a mechanical failure within the fan motor or a buildup of dirt and debris that prevents the blades from turning freely. In some cases, the plastic tubes that measure air pressure can become blocked or split, sending a false 'stop' signal to the system.
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.
Find a Gas Safe engineer
Search the official register →