Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
Selector Switch in HW position.
Remove Combustion Chamber cover.
WARNING! Mains voltage is expected during test, follow TOPs P4 live testing procedure
Mains Power On

Observation:

Depress the Gas Valve Control Valve Knob for at least 20 seconds.
Can the Pilot be lit with a match?