Set Appliance State:

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

Measurement:

Measure voltage across the live (brown lead) and the neutral (blue lead) at the mains power input terminals on the green terminal block marked 230 V on the PCB.
Expected voltage between 220 and 240 volts AC.