Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to Resistance 
Disconnect plug marked CON3 at the PCB
Measurement:
Test 1:
Measure the resistance between the red and black wires at the disconnected plug.
Resistance should be greater than 120Ω.
Resistance on ErP pumps will be significantly higher.
Test 2:
Measure the resistance between the red wire at the disconnected plug to a suitable earth point.
Resistance should be greater than 1MΩ (or O.L).
Measure the resistance between the red and black wires at the disconnected plug.
Resistance should be greater than 120Ω.
Resistance on ErP pumps will be significantly higher.
Test 2:
Measure the resistance between the red wire at the disconnected plug to a suitable earth point.
Resistance should be greater than 1MΩ (or O.L).
Isolate as per TOPs P4
and refit as necessary