Eu Voltage Test Sensor Failure - Friedrich Chill Premier Inverter Series Service Manual

After power relay works, when tested voltage effective value less than 50V for 3s continuously, unit will display

EU voltage test sensor failure

EU.
31
TROUBLESHOOTING
Start
Display EU
Test voltage btw Main
PCB terminal L/N,
more than
50V~?
Yes
Replace Main PCB
End
No Troubleshoot Line voltage
problem source.
Unit works?
No
Yes
37