Set Appliance State:

Mains Power Off
Gas Off
Set Multimeter to AC Volts Set meter to measure AC Volts
Selector switch in the OFF (mid) position
Remove fuse holder, hinge back mains power inspection cover
Note do not remove any screws from electrical control box
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Measurement:

Replace Fuse Holder and measure mains voltage
on terminal 1 (L) and terminal 2 (N).