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

Observation:

Ensure there is no demand for heating.
Measure voltage across the tip of the
spark electrode to a suitable earth point.
Expected voltage approximately 190V AC.