Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to Resistance 
Gain access to PCB (use Insulation Mat as required)
Disconnect connector X401 from the PCB
Disconnect connector X401 from the PCB
Observation:
Measure the resistances between the 4 wires to the fan.
(Pins 3, 4, 5, and 6 of X401)
Resistances should conform approximately to the table below.
Inspect the length of the harness and the plugs for good overall condition.
(Pins 3, 4, 5, and 6 of X401)
Resistances should conform approximately to the table below.
Inspect the length of the harness and the plugs for good overall condition.
Isolate as per TOPs P4
and refit as necessary