Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
Set Multimeter to Resistance Set meter to measure resistance
Remove connector X25 from the PCB

Measurement:

Test 1:
Measure the resistance between pin 1 (Blue) and pin 2 (Red) on connector X25.
Expect approximately 178 ohms.
Test 2:
Measure the resistance between pin 1 (Blue) and Earth.
Expect open circuit.
Test 3:
Measure the resistance between pin 2 (Red) and Earth.
Expect open circuit.
Note:
Each pin on the PCB connector is numbered.