Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to Resistance 
Remove the connector from the Aqua sensor
Remove connector X2 from the PCB
Remove connector X2 from the PCB
Measurement:
Measure the resistance between the points as listed below:
Pin 1 on connector X2 to the green wire on the hall sensor connector.
Pin 13 on connector X2 to the red wire on the hall sensor connector.
Pin 23 on connector X2 to the black wire on the hall sensor connector.
Expect continuity / zero resistance on each wire.
Also visually inspect the harness for good general condition.
Are the resistances as expected and is the harness in good condition?
Pin 1 on connector X2 to the green wire on the hall sensor connector.
Pin 13 on connector X2 to the red wire on the hall sensor connector.
Pin 23 on connector X2 to the black wire on the hall sensor connector.
Expect continuity / zero resistance on each wire.
Also visually inspect the harness for good general condition.
Are the resistances as expected and is the harness in good condition?
Isolate as per TOPs P4
and refit as necessary