Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
Set Multimeter to Resistance Set meter to measure resistance
Remove the cover from the pump assembly
Remove the wires from the pump assembly

Measurement:

Test 1:
Measure the resistance between the live and neutral terminals of the pump assembly.
Expect approximately 160 ohms or greater.
Test 2:
Measure the resistance between the live and earth terminals of the pump assembly.
Expect a resistance of 1 Mohm or greater.
Are the resistances measured as expected?