Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
Set Multimeter to Resistance Set meter to measure resistance
Remove the fan PCB

Measurement:

Test 1.
Measure the resistance between the exposed terminals on the fan.
Expected resistance approximately 78 ohms.
Test 2.
Measure the resistance between each fan terminal individually
to a suitable earth point.
Expected resistance greater than 1 MOhm.
Note.
A reading of O.L on Test 2 is acceptable as this is greater than 1 MOhm.