Set Appliance State:

Set Multimeter to AC Voltage Set meter to measure AC Volts
CH Demand
Isolate Mains Power to appliance as per TOPs P4
Remove pump cover
Boiler on/off switch ON
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Measurement:

Measure voltage across live and neutral connections at the pump.
Note:
Pump is not an integral part of the appliance.