Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to Resistance 
Remove connector X12 from the PCB
Measurement:
Test 1. Measure for resistance across pins 19 (blue) and 20 (brown) of connector X12.
Expected resistance approximately 24Ω.
Test 2. Measure for resistance across pin 20 (brown) of connector X12 and a suitable earth.
Expected resistance greater than 1MΩ (or O.L)
Expected resistance approximately 24Ω.
Test 2. Measure for resistance across pin 20 (brown) of connector X12 and a suitable earth.
Expected resistance greater than 1MΩ (or O.L)
Isolate as per TOPs P4
and refit as necessary