Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to Resistance 
Disconnect connector X401 from the PCB
Measurement:
Test 1:
Measure the resistance on the harness connections as below.
The resistance should conform approximately to the table below:
Test 2:
Measure the Resistance between each of the following wires to earth:
Measure the resistance on the harness connections as below.
The resistance should conform approximately to the table below:
| Leads | Resistance | Brown(3)-Blue(4) | 18.8kOhms |
| Blue(4)-Black(5) | 33.7kOhms |
| Brown(3)-Black(5) | 14.9kOhms |
Test 2:
Measure the Resistance between each of the following wires to earth:
| Leads | Resistance in Ohms | Brown(3) | 1 MOhm or greater |
| Blue(4) | 1 MOhm or greater |
| Black(5) | 1 MOhm or greater |
| Green(6) | 1 MOhm or greater |
Isolate as per TOPs P4
and refit as necessary