Set Appliance State:

Set Multimeter to Resistance Set meter to measure resistance
Isolate Mains Power to appliance as per TOPs P4
Remove rear control panel cover to expose main PCB
Remove connector H2 from main PCB

Measurement:

Test 1:
Measure resistance across the brown lead and blue lead connection (1 and 4) on the connector marked H2 on the main PCB.
Test 2:
Measure resistance across the live and suitable Earth.
Expected resistance O.L or greater than 1MOhm on both tests.