Set Appliance State:

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 establish and the boiler to run in CH mode for 30 seconds.
Turn off the CH demand and monitor the pump assembly.
The pump should overrun after demand has ended for approximately 30 seconds?
Does the pump overrun behave as described?