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)
Remove electrical connector from fan assembly and make safe
Remove electrical connector from fan assembly and make safe
| WARNING! - Mains voltage is expected during test follow TOPs P4 live testing procedure |
Measurement:
Reset appliance if required (Press reset button once then release)
Measure the DC voltage between pin 17 on connector X2 and a suitable earth.
Expect approximately 21vdc.
Is the voltage measured as expected?
Measure the DC voltage between pin 17 on connector X2 and a suitable earth.
Expect approximately 21vdc.
Is the voltage measured as expected?
Isolate as per TOPs P4
and refit as necessary