Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to Resistance 
Remove connector X25 from the PCB
Measurement:
Test 1: Measure the resistance between each of the pins listed
in the table below expect the values listed.
Test 2: Measure the resistance between pin 3 (2 Reds) and a suitable earth.
Expected resistance greater than 1 MOhm.
Test 3: Measure the resistance between of each of the pins listed in the table above to a suitable earth.
Expected resistance greater than 1 MOhm.
Note: Each pin on the PCB connector is numbered.
in the table below expect the values listed.
| Pin | Resistance | 3 (2 reds) and 5 (Blue) | 121 ohms |
| 3 (2 reds) and 4 (Brown) | 121 ohms |
| 3 (2 reds) and pin10 (Green) | 121 ohms |
| 3 (2 reds) and pin 11 (Black) | 121ohms |
Test 2: Measure the resistance between pin 3 (2 Reds) and a suitable earth.
Expected resistance greater than 1 MOhm.
Test 3: Measure the resistance between of each of the pins listed in the table above to a suitable earth.
Expected resistance greater than 1 MOhm.
Note: Each pin on the PCB connector is numbered.
 connector x25.gif)
Isolate as per TOPs P4
and refit as necessary