Set Appliance State:

Mains Power Off
Turn Hot Water Tap On
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Observation:

Does pump run satisfactorily?
Notes:
Do not take sound or vibration as sign of pump running.
If pump vent plug is removed to observe pump shaft then care should be taken that water does not drip on to control box.