Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
Set Multimeter to Resistance Set meter to measure resistance
Disconnect X1 and X2 from the PCB

Measurement:

Check for continuity (zero resistance) between
Pin 1 (Red) on X1 to Pin 6 (Black) on X2.
Inspect harness and connectors for good overall condition.
Note:
Wires may be multicoloured.