Set Appliance State:

Mains Power Off
CH Demand
On/Off Switch in ON position
Mode Selector Switch to Summer
DHW Thermostat to MAX
WARNING! Mains voltage is expected during test, follow TOPs P4 live testing procedure
Mains Power On

Observation:

Does the Water Pump run?
NOTE:
Do not take noise or vibration as an indication that the pump is running.