Set Appliance State:

Set Multimeter to AC Volts Set meter to measure AC Volts
Isolate Mains Power to appliance as per TOPs P4
Use insulation mat as necessary
Remove small plastic cover from rear of the control box
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Measurement:

Measure voltage across terminal marked N (blue lead ) and terminal marked L (brown lead) on the main terminal strip.