Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to DC Volts 
Gain access to PCB (use Insulation Mat as required)
| WARNING! - Mains voltage is expected during test follow TOPs P4 live testing procedure |
Measurement:
Measure the DC voltage between pin 12 (blue) and pin 9 (purple) at the fan board.
Voltage should be approximately 35V DC.
Voltage should be approximately 35V DC.
Isolate as per TOPs P4
and refit as necessary