Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to DC Volts 
Leave connector in place
| WARNING! - Mains voltage is expected during test follow TOPs P4 live testing procedure |
Measurement:
Once the fan begins to run measure the voltage between the black wire (pin 3) on connector marked X20 and a suitable earth.
Approximately 6V DC should be present.
Approximately 6V DC should be present.
Isolate as per TOPs P4
and refit as necessary