Set Appliance State:

Mains Power Off
Set Multimeter to AC Volts Set meter to measure AC Volts
No Demand from external controls
WARNING! Mains voltage is expected during test, follow TOPs P4 live testing procedure
Mains Power On

Measurement:

Measure Mains Voltage across the PCB connection X1 on the far right hand side blue wire on connector and the Neutral on the main terminal block.