Set Appliance State:

Mains Power Off
Gas Off
Set Multimeter to AC Voltage Set meter to measure AC Volts
Selector Switch in Summer (I) position
Remove connector J12 (bottom right on pcb).
Clip multimeter leads to J12 pins on pcb.
WARNING! Mains voltage is expected during test, follow TOPs P4 live testing procedure
Mains Power On

Measurement:

Hold in ignition button and measure
MAINS VOLTAGE after 20 seconds.
Note:
Approx 20V AC will be measured first, before mains voltage appears.