Aiwa -09CHSRINV/TP11 Service Manual page 47

3.2.9 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
Air Conditioner Service Manual
Display P1
Is the power supply
voltage btw145-260V?
Yes
Is the busbar voltage
btw150-420V?
Yes
Replace ODU PCB
End
Wait until the AC
No
voltage recovery
Is the power supply
voltage btw145-260V?
No
Wait until the busbar
No
voltage recovery
Unit works
normal?
No
Yes
Yes
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