Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
Set Multimeter to AC Voltage Set meter to measure AC Volts
CH Demand
Selector switch to CH
Remove bottom facia panel
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Measurement:

Measure the voltage across the pump live connection 1 and the pump neutral connection 2 (blue and brown wires) at connector X3 (two pin connector marked PUMP) left of centre on the PCB.