Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to Resistance 
Remove connector CN203 from the PCB
Measurement:
Measure for resistance across pins 4 & 5 (grey wires) of connector CN203.
Expected resistance short circuit.
Is the resistance measured as expected?
Expected resistance short circuit.
Is the resistance measured as expected?
Isolate as per TOPs P4
and refit as necessary