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.
Allow the Boiler to run and reach a high operational temperature.
Switch the boiler off using the Boiler On/Off Switch.
Does the Pump continue to run until the Boiler is cooled down sufficiently?
Note:
It may be necessary to reduce the heating load by turning off some radiators. This will shorten time required for this test.