Set Appliance State:

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

Measurement:

Test 1:
Measure the resistance between the live and neutral terminals of the pump assembly.
Expect approximately 180 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?