Set Appliance State:

Mains Power Off
CH Demand
On/Off Switch On.
Gas On
WARNING! Mains voltage is expected during test, follow TOPs P4 live testing procedure
Mains Power On

Observation:

Allow the Boiler to purge itself and the Burner to ignite.
With the Boiler Operating, turn off the gas supply and allow the Boiler to switch to its Lockout condition.
After approximately 30 seconds can the Boiler be Reset using the Reset Switch?