Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to Resistance 
Gain access to PCB (use Insulation Mat as required)
Remove plug from air pressure sensor and remove plug from PCB on right hand side marked C13
Remove plug from air pressure sensor and remove plug from PCB on right hand side marked C13
Measurement:
Check the continuity and general condition of each of the leads in the harness.
Checking each lead in turn from air pressure sensor plug to PCB plug:
Does each individual lead show continuity?
Expected reading short circuit / zero resistance
Checking each lead in turn from air pressure sensor plug to PCB plug:
Does each individual lead show continuity?
Expected reading short circuit / zero resistance
Isolate as per TOPs P4
and refit as necessary