Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to Resistance 
Remove ST17 connector from the PCB
If available use the Worcester test PCB to assist resistance test
If available use the Worcester test PCB to assist resistance test
Measurement:
Resistances should be approximately as per the table:
Isolate as per TOPs P4
and refit as necessary