Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to Resistance 
Disconnect connector J3 from the control PCB
Measurement:
Test 1:
Measure the resistance between pin 5 (brown) and pin 4 (dark blue) wires on J3 connector.
Resistance should be approximately 160 Ohms.
Test 2:
Measure the resistance between pin 5 (brown) on J3 connector to a suitable earth point.
Resistance should be greater than 1M Ohm.
Measure the resistance between pin 5 (brown) and pin 4 (dark blue) wires on J3 connector.
Resistance should be approximately 160 Ohms.
Test 2:
Measure the resistance between pin 5 (brown) on J3 connector to a suitable earth point.
Resistance should be greater than 1M Ohm.
Isolate as per TOPs P4
and refit as necessary