Set Appliance State:

Gas On; Pilot On
Boiler On
Selector lever RIGHT - CH/HW Position
System calling for heat
Clock On
WARNING! Mains voltage is expected during test, follow TOPs P4 live testing procedure
Mains Power On

Observation:

Observe flame through window.
With a demand for heat, boiler will light up.
Temperature can be controlled via boiler thermostat.