Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
Set Multimeter to AC Voltage Set meter to measure AC Volts
CH Demand
Control Thermostat in high position
High/Low Switch in High position
WARNING! Mains voltage is expected during test, follow TOPs P4 live testing procedure
Mains Power On

Measurement:

Allow the Burner to ignite and measure the voltage across connection 1 (Red wire) on the connector marked LAMP and connection 1 (Black wire) on the connector marked LAMP N on the Interconnection Board.