Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
Set Multimeter to AC Volts Set meter to measure AC Volts
CH Demand
CH temperature control to max
Selector switch set to ch/dhw
Remove pump cover
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Measurement:

Measure for mains voltage across connections brown (live) and blue (neutral) connections at the pump.
Expected voltage, mains voltage.