Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
Set Multimeter to Resistance Set meter to measure resistance
Remove connector CN4 from the PCB
Disconnect the plug from the thermal fuse

Measurement:

Test 1:
Measure the resistance between pin 1 (black) on the
thermal fuse connector and pin 24 (black) on connector CN4.
Test 2:
Measure the resistance between pin 2 (black) on the
thermal fuse connector and pin 25 (black) on connector CN4.
Expect continuity/zero resistance on each of the above tests.
Also visually inspect the condition of the harness.