Set Appliance State:

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

Observation:

Allow the appliance to ignite and run in central heating mode for 1 minute.
Remove the demand and monitor the pump.
The pump should continue to run for 5 minutes after the demand has been removed and the burner has extinguished.
Does the pump overrun operate as expected?