Set Appliance State:

CH Demand
Isolate Mains Power to appliance as per TOPs P4
Operating Switch in Heating & Water position
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Observation:

Remove Water Pump inspection cover to observe pump running.
Note:
Do not take Noise or Vibration as an indication that the pump is running.