Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to Resistance 
Remove connector X2 from the PCB
Remove connector to system pressure sensor
Remove connector to system pressure sensor
Measurement:
Measure for resistance across each wire of the system pressure sensor harness, pins 11,13,14 of X2 to the corresponding wire on the sensor connector. (e.g. orange lead (pin 11) X2 connector to orange lead of system pressure 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?
Note.
Ensure a good connection is made as misdiagnosis may occur.
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?
Note.
Ensure a good connection is made as misdiagnosis may occur.
Isolate as per TOPs P4
and refit as necessary