Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
Set Multimeter to Resistance Set meter to measure resistance
Remove X1 from the PCB

Measurement:

Test 1. Measure for resistance across pins 5 (Brown) and 6 (Blue) of X1.
Expected resistance approximately 160 Ohms.
Test 2. Measure for resistance across pin 5 (Brown) and Earth
(Main terminal block).
Expected resistance Open circuit.
Test 3. Measure for resistance across pin 6 (Blue) and Earth
(Main terminal block).
Expected resistance Open circuit.