Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to Resistance 
Unplug connector X15 from PCB
Measurement:
Test the resistances between the wires at the disconnected connector block.
The Readings should conform approx to the table below:
The Readings should conform approx to the table below:
| Leads | Ohms | Grey & Yellow | 9.3 KOhms |
| Red & Grey | 8.3 MOhms |
Isolate as per TOPs P4
and refit as necessary