Set Appliance State:

Mains Power Off
CH Demand
Selector switch set to CH/DHW position
Boiler CH thermostat set to MAX
Ensure CH controls are calling for heat
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Observation:

Allow the burner to ignite and run with a CH demand for approx. 30 seconds.
Remove the CH demand.
Does the pump continue to run for approximately 10 seconds ?