Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
Set Multimeter to Resistance Set meter to measure resistance
Gain access to the display PCB
Release the 2 clips on the facia and lower the panel
Remove connector X2 from the display PCB

Measurement:

Test 1.
Turn the clock to the ON position.
Measure the resistance between pin 2 (white)
and pin 5 (green) on connector X2.
Expected resistance open circuit.
Test 2.
Turn the clock to the OFF position.
Repeat the above test.
Expected resistance short circuit.