P1 Over / Under Voltage Protection - Friedrich Chill Premier Inverter Series Service Manual

3.2.9 P1--- Over / under voltage protection

P1 Over / under voltage protection

1. Test voltage between L & N, When the power supply V＞AC 160V or V＜AC 85V, AC will display
P1 protection, unit will recover back to previous status while V＞AC 90V.
2. Test voltage on the large electrolytic capacitor of Main PCB, When DC bus bar voltage V＞DC420V
or V＜DC150V, unit will recover back to previous status while DC190V＜V＜DC410V
33
TROUBLESHOOTING
Display P1
Is the power supply
voltage btw 85-165V?
Yes
Is the busbar voltage
btw150-420V?
Yes
Replace Main PCB
End
Wait until the AC
No
voltage recovery
Is the power supply
voltage btw 85-165V?
No
Wait until the bus
No
bar voltage recovery
Unit works
normal?
No
Yes
Yes