Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to Resistance 
Disconnect connector X6 from the PCB
Measurement:
Test 1:
Measure the resistance between the grey wire marked 4
and the black wire marked 3 on X6 connector.
Resistance should be approximately 2.8kOhms.
Test 2:
Measure the resistance between the red wire marked 2
and the violet wire marked 1 on X6 connector.
Resistance should be approximately 1.6kOhms.
Test 3:
Measure the resistance between each of the four wires
(grey, black, red and violet), in turn, to a suitable earth point.
Resistance should be above 1M Ohm on each of the 4 checks.
Measure the resistance between the grey wire marked 4
and the black wire marked 3 on X6 connector.
Resistance should be approximately 2.8kOhms.
Test 2:
Measure the resistance between the red wire marked 2
and the violet wire marked 1 on X6 connector.
Resistance should be approximately 1.6kOhms.
Test 3:
Measure the resistance between each of the four wires
(grey, black, red and violet), in turn, to a suitable earth point.
Resistance should be above 1M Ohm on each of the 4 checks.
Isolate as per TOPs P4
and refit as necessary