Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to Resistance 
Disconnect Fan DC controller connector marked H3 on the main PCB.
Measurement:
Test 1:
Measure resistance across the live (brown lead)
and neutral (blue lead) connection on the connector.
Expect Approx. 44 Ohms.
Test 2:
Measure resistance across the live
(brown lead) and a suitable earth point.
Expected resistance O.L or greater than 1MOhm.
Measure resistance across the live (brown lead)
and neutral (blue lead) connection on the connector.
Expect Approx. 44 Ohms.
Test 2:
Measure resistance across the live
(brown lead) and a suitable earth point.
Expected resistance O.L or greater than 1MOhm.
Isolate as per TOPs P4
and refit as necessary