Set Appliance State:

Mains Power Off
Turn Hot Water Tap On
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Observation:

Allow the 4 minute pump purge to complete.
Allow the burner to ignite and run with a DHW demand for 1 minute.
Remove the DHW demand.
Does the pump continue to run for approximately 15 seconds?