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:
Check the harness leads for continuity.
On connector block X2 measure the continuity of pins 9 (black),11 (red) and 12 (green) to the corresponding leads of the disconnected plug to the low water pressure switch.
Check the general condition of the lead.
On connector block X2 measure the continuity of pins 9 (black),11 (red) and 12 (green) to the corresponding leads of the disconnected plug to the low water pressure switch.
Check the general condition of the lead.
Isolate as per TOPs P4
and refit as necessary