Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to Resistance 
Disconnect fan connector (red and blue wires) from the PCB
Measurement:
Test 1:
Measure the resistance across the red and blue wires of the disconnected connector.
Expected resistance approx. 117 ohms to 170 ohms.
Test 2:
Measure the resistance between the red wire of the disconnected connector and a suitable earth point.
Expected resistance above 1 MOhm.
Measure the resistance across the red and blue wires of the disconnected connector.
Expected resistance approx. 117 ohms to 170 ohms.
Test 2:
Measure the resistance between the red wire of the disconnected connector and a suitable earth point.
Expected resistance above 1 MOhm.
Isolate as per TOPs P4
and refit as necessary