Troubleshooting Guide

Air Conditioner Service Manual
48
3.3.10 P1--- Over / under voltage protection
1. Test voltage between L &N, When the power supply V＞AC260V or V＜AC150V, AC will display P1 protection,
unit will recover back to previous status while V＞AC155V.
2. Test voltage on the big size electrolytic capacitor of ODU PCB, When DC busbar voltage V＞DC420V or V
＜DC150V, unit will recover back to previous status while DC190V＜V＜DC410V
Display P1
Is the power supply
voltage btw145-260V?
Wait until the AC
voltage recovery
Replace ODU PCB
Yes
Yes
No
No
No
Yes
No
End
Wait until the busbar
voltage recovery
Unit works
normal?
Yes
Is the power supply
voltage btw145-260V?
Is the busbar voltage
btw150-420V?