Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
Set Multimeter to Resistance Set meter to measure resistance
Disconnect fan connector (X22) from the PCB

Measurement:

Test 1.
Measure resistance across white lead 1 and grey lead 2.
Expected resistance approximately 8.1 MOhms.
Test 2.
Measure resistance across white lead 1 and blue lead 3.
Expected resistance approximately 55 kOhms.
Test 3.
Measure resistance across white lead 1 and black lead 4
Expected resistance approximately 55 kOhms.
Test 4.
Measure resistance across white lead 1 and red lead 5.
Expected resistance approximately 3.2 MOhms.