Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to Resistance 
Remove the 4 wire connector from the fan
Measurement:
Measure the resistance between the following pins:
The resistance should conform approx. to the table below:
The resistance should conform approx. to the table below:
| Pins | Resistance | 1 and 4 | 3.4Mohms |
| 2 and 4 | 50Kohms |
| 2 and 5 | 33Kohms |
| 4 and 5 | 16Kohms |
Isolate as per TOPs P4
and refit as necessary