Set Appliance State:

Mains Power Off
CH Demand
Note: Pump is not an integral part of the appliance
so it will be elsewhere on the system
Gas On
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Observation:

Allow the boiler to run for one minute with the central heating demand.
Remove CH demand.
Does the pump continue to run for approximately 8 minutes?