Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
Set Multimeter to Resistance Set meter to measure resistance
Turn Hot Water Tap On
Gain access to PCB (use Insulation Mat as required)
Disconnect connector X7 from the PCB

Measurement:

Measure the resistance between pin 7 (pink)
and pin 8 (black) at connector X7.
Resistance should be short circuit (zero resistance).