LG ARUV Series Service Manual page 259

Error
Error Type
No.
25(Main)
Low / over voltage of main
147(Sub1)
PCB input
149(Sub2)
171(Sub3)
Error diagnosis and countermeasure flow chart
Is input voltage of main
PCB (T-N) 190V~250V ?*
Yes
Replace main PCB
* Check voltage at outdoor T/Block(220V)
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Only for training and service purposes
Error Point
The power supply input
voltage tolerance is more
or less than allowable
standard
No
Check input power from building
is supplied correctly or not
1. Input voltage is abnormal(T-N)
2. Outdoor unit main PCB defect
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Troubleshooting Guide
Main Reasons
LGE Internal Use Only