Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
Set Multimeter to Resistance Set meter to measure resistance
Gain access to pump wiring connections
Disconnect wires from the pump or remove connector

Measurement:

Test 1:
Measure the resistance across the disconnected pump live and neutral.
Expected resistance greater than 80 Ohms for standard pumps and greater than 1MOhm for ErP pumps.
Test 2:
Measure the resistance between the disconnected pump live and earth.
Expected resistance greater than 1M Ohm.
Test 3:
Measure the resistance between the disconnected pump neutral and earth.
Expected resistance greater than 1M Ohm.