Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to Resistance 
Remove connector X5 from the display PCB
Measurement:
Test 1:
Measure the resistance between each of the wires as listed in the table below:
Test 2:
Measure the resistance between each of the pins 1, 2, 5 and 6 to earth.
Expect a resistance greater than 1MΩ (or O.L) on each wire.
Are the resistances measured as expected?
Measure the resistance between each of the wires as listed in the table below:
| Test point 1 | Test point 2 | Resistance |
| Pin 1 | Pin 5 | 28kΩ |
| Pin 2 | Pin 5 | Greater than 1MΩ (or O.L) |
| Pin 6 | Pin 5 | Greater than 1MΩ (or O.L) |
Test 2:
Measure the resistance between each of the pins 1, 2, 5 and 6 to earth.
Expect a resistance greater than 1MΩ (or O.L) on each wire.
Are the resistances measured as expected?
Isolate as per TOPs P4
and refit as necessary