Set Appliance State:

WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Observation:

Access 2.9F (pump overrun length) in Menu 2 of the boiler settings.
Click here for information on accessing the boiler settings.
Check if the pump overrun time has been adjusted from default (3min). It can be set between 3 and 30 minutes.
If the setting has been changed, retest the CH pump overrun and confirm it overruns as per setting.