Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
Set Multimeter to DC Volts Set meter to measure DC Volts
Gain access to PCB (use Insulation Mat as required)
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Measurement:

Measure for DC volts across pin 3 (pink) CN203 and pin 4 (white) CN206 main PCB.
The voltage measured will depend if a fault has been detected in certain circuitry, if 12 Vdc is measured NO fault has been detected and choose that option from below.
Note:
Ensure a good connection is made or misdiagnosis will occur.