Set Appliance State:

Mains Power Off
Turn Hot Water Tap On
ON/OFF Switch ON
Summer/Winter button set to Summer
CH Temperature selector to minimum
DHW Temperature selector to maximum
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Observation:

Does the pump run?
Note:
Do not take noise or vibration as indication of pump operation.