Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to Resistance 
Remove connector X2 from the PCB
Measurement:
Measure the resistance between each of the pins as listed in the table below:
Are the resistances measured as expected?
| Pins | Resistance (approx.) |
| 17 to 12 | 1 MOhm or greater | 3 to 12 | 1 MOhm or greater | 7 to 12 | 23.6 kOhms |
Are the resistances measured as expected?
Isolate as per TOPs P4
and refit as necessary