Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
Set Multimeter to Resistance Set meter to measure resistance
Remove connector CN3 from the PCB
Disconnect the connector from the thermofuse

Measurement:

Test 1.
Measure the resistance between pin 5 (brown) on
connector CN3 to pin 1 on the thermofuse harness
Test 1.
Measure the resistance between pin 6 (brown) on
connector CN3 to pin 2 on the thermofuse harness
Expect continuity / zero resistance on each test.
Also visually inspect the condition of the harness.