Set Appliance State:

Mains Power Off
Selector switch in Off position
CH temperature selector to maximum
DHW temperature selector to maximum
WARNING! Mains voltage is expected during test, follow TOPs P4 live testing procedure
Mains Power On

Observation:

Test 1:
With no CH demand the spindle should be retracted.
Test 2:
Apply a CH demand and allow pump to run.
Approximately 2 - 3 seconds after the pump has started the spindle should extend & be smooth in operation.
Test 3:
Turn Selector switch to OFF position
Turn CH demand OFF
Turn HW tap ON
Selector switch to ON position and allow pump to run, approximately 2 - 3 seconds after the pump has started the spindle should extend & be smooth in operation.