Set Appliance State:

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

Observation:

Boiler switch On.
Reset as necessary.
Allow system to fire and reach a reasonable operating temperature,
approximately 60°C then turn off the room thermostat.
When the burner shuts down does the fan overrun for approximately 50 seconds and the pump continue to run until the residual heat in the boiler has been cleared?