Technical description
Fan shut down during safety time
What causes this fault?
This fault occurs when the boiler's control system loses communication with the fan or detects that it isn't spinning at the required speed during its startup safety checks. The most common reason is a mechanical failure within the fan motor or a fault in the electronic control board that prevents power from reaching the fan. Without a functioning fan to safely clear exhaust gases, the boiler is programmed to shut down immediately.
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.