Your boiler has stopped working because the internal fan, which safely helps the system breathe and clear exhaust gases, is not spinning correctly.

Fan fault

What causes this fault?

This fault occurs when the boiler's control system detects that the fan is not spinning at the required speed to safely clear exhaust gases from the flue. The most common reasons are a mechanical failure within the fan motor itself, loose internal wiring, or a fault on the main circuit board that prevents it from sending power to the fan.