Set Appliance State:

Mains Power Off
Gas On; Pilot On
CH Demand
Selector Switch in winter position
Heating control turned to maximum
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Observation:

After approximately 5 seconds does main burner increase to high flame.
A 'click' will be heard from the Orange Solenoid.