Set Appliance State:

Mains Power Off
CH Demand
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 1 minute.
Remove the CH demand.
Does the pump continue to run for approximately 5 minutes?
Notes:
1. This setting is adjustable in the appliance diagnostic codes.
If the boiler does not behave as described above, it is advisable
to check Diagnostic code D.001.
2. The default setting is 5 minutes.
CLICK HERE for guidance on how to access and adjust the diagnostic codes.
Alternatively refer to Adapt for guidance.