Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to Resistance 
Disconnect connector X23 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:
The resistance should conform approximately to the table below:
| Leads | Resistance | Blue(1)-Brown(2) | 34kOhms |
| Brown(2)-Black(4) | 16kOhms |
| Blue(1)-Black(4) | 50kOhms |
Test 2:Measure the Resistance between each of the following wires to earth:
| Leads | Resistance in Ohms | Blue(1) | Open Circuit |
| Brown(2) | Open Circuit |
| Green(3) | Open Circuit |
| Black(4) | Open Circuit |
Isolate as per TOPs P4
and refit as necessary