Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to Resistance 
Remove connector X1 from the main PCB
Measurement:
Test 1:
Measure the resistance between middle blue and brown wires at X1.
Resistance should be approximately 225Ω.
If different pump has been fitted resistance may be
different, ErP pumps will be significantly higher
Test 2:
Measure the resistance between the middle brown wire at X1 to a suitable earth point.
Resistance should be greater than 1MΩ (or O.L.)
Measure the resistance between middle blue and brown wires at X1.
Resistance should be approximately 225Ω.
If different pump has been fitted resistance may be
different, ErP pumps will be significantly higher
Test 2:
Measure the resistance between the middle brown wire at X1 to a suitable earth point.
Resistance should be greater than 1MΩ (or O.L.)
Isolate as per TOPs P4
and refit as necessary