Set Appliance State:

CH Demand
CH temperature control set to MAX
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Observation:

Allow the boiler to run until the flow temp reaches 60°C.
Remove CH demand at clock or room stat.
Does the pump continue to overrun for approximately
3 minutes or less?
Note:
To reduce the heating time some radiators can be turned off.