Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
Remove the connector from the ignition control box
Remove the pink wire from the connector and make safe
Refit the connector to the ignition control box
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Observation:

Does the fan now run with the pink wire removed?