Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to Continuity 
Disconnect connector X2 from the PCB
Disconnect connector from the low water pressure switch
Disconnect connector from the low water pressure switch
Measurement:
Continuity of pressure sensor harness.
At disconnected connector X2, measure the continuity of pins 9 (black),11 (red) and 12 (green) to the corresponding leads of the disconnected plug to the pressure sensor.
At disconnected connector X2, measure the continuity of pins 9 (black),11 (red) and 12 (green) to the corresponding leads of the disconnected plug to the pressure sensor.
| Test | Leads | 1 | Green - Green |
| 2 | Red - Red |
| 3 | Black - Black |
Isolate as per TOPs P4
and refit as necessary