Set Appliance State:

Mains Power Off
Set Multimeter to AC Voltage Set meter to measure AC Volts
On/Off Switch Off.
WARNING! Mains voltage is expected during test, follow TOPs P4 live testing procedure
Mains Power On

Measurement:

Measure Mains Voltage across PCB connector connection 6 (Orange wire) and PCB connector connection 7 (Blue wire) on the Control Box (PCB).