Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
Set Multimeter to Resistance Set meter to measure resistance
Disconnect leads from fan assembly (note connections for reinstatement).

Measurement:

Test 1: Measure the resistance across fan terminals.
Expected resistance readings should conform to the table below:
TerminalResistance in Ohms
Black - Red(Approximately) 64 ohms
Black - White (Approximately) 95 ohms

Test 2: Measure the resistance between the
terminal for the black wire to a suitable earth point.
Resistance should be greater than 1M Ohm.