Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to Resistance 
Remove air intake
Remove electrical connector to parameter unit
Remove electrical connector to parameter unit
Measurement:
Measure the resistance between pins 10, 11, 12 and 13 on
connector X5 on the PCB to the disconnected parameter
unit connector, as per the table below;
Expect continuity / zero resistance on each wire.
Also visually inspect the condition of the harness.
Note.
Place the probe in the small holes on the PCB.
connector X5 on the PCB to the disconnected parameter
unit connector, as per the table below;
| Pin on connector X5 | Parameter unit connector | 10 | 4 |
| 11 | 1 |
| 12 | 3 |
| 13 | 2 |
Expect continuity / zero resistance on each wire.
Also visually inspect the condition of the harness.
Note.
Place the probe in the small holes on the PCB.
Isolate as per TOPs P4
and refit as necessary