Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
Set Multimeter to AC Volts Set meter to measure AC Volts
Turn Hot Water Tap On
Selector switch set to CH/DHW
Boiler DHW thermostat set to MAX
Remove pump cover
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Measurement:

Measure the AC voltage between the brown (Live)
and blue (Neutral) wires at the pump.
Expect mains voltage.