Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to DC Volts 
Turn Hot Water Tap On
Reconnect fan connector at the fan if you have not already done so
| WARNING! - Mains voltage is expected during test follow TOPs P4 live testing procedure |
Measurement:
Allow the fan to start to run.
Measure the DC voltage between the green wire on the 6 way connector and the main PCB neutral.
Expect approximately 5.8 VDC.
Is the voltage measured as expected?
Measure the DC voltage between the green wire on the 6 way connector and the main PCB neutral.
Expect approximately 5.8 VDC.
Is the voltage measured as expected?
Isolate as per TOPs P4
and refit as necessary