Set Appliance State:

Mains Power Off
Set Multimeter to AC Voltage Set meter to measure AC Volts
CH Demand
Selector Switch in CH CONTINUOUS position
WARNING! Mains voltage is expected during test, follow TOPs P4 live testing procedure
Mains Power On

Measurement:

Measure the voltage across the Blue wire and the Brown wire at the Pump.
Note: There will be a delay of between 1 and 3 mins before boiler starts if Power has been switched off or CH demand has been interrupted.