Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
Set Multimeter to Resistance Set meter to measure resistance

Measurement:

Test 1.
Measure the resistance between the brown wire on
connector X1 to the brown wire at the terminal block.
Test 2.
Measure the resistance between the blue wire on
connector X1 to the blue wire at the terminal block.
Expect continuity / zero resistance on each test.
Also visually inspect the harness and connectors.