Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
Set Multimeter to Resistance Set meter to measure resistance
Remove the pump connector ST4 from the pcb

Measurement:

Measure resistance across blue (neutral) and live (brown), then across live (brown) and Earth (green/yellow) of disconnected connector ST4.
Expected resistance (approx) as below.
LeadsResistance in Ohms
Brown - Blue400 Ohms
Brown - Earth Open Circuit