Set Appliance State:

CH Demand
Isolate Mains Power to appliance as per TOPs P4
Selector switch in winter position
Timer switched to FIX ON
Remove water pump inspection cover
WARNING! Mains voltage is expected during test, follow TOPs P4 live testing procedure
Mains Power On

Observation:

Observe pump start/run to verify operation.
Note:
Do not take sound or vibration as a sign of correct operation.