LG ARUV Series Service Manual page 267

Error
Error Type
No.
Over-Capacity
(Sum of indoor unit capaci-
51
ty is more than outdoor
capacity)
Error diagnosis and countermeasure flow chart
Is capacity sum of
indoor units less than
130% of outdoor unit
capacity at LGMV?
Yes
Is SUB DIP switch
5(SUB1), 6(SUB2)
ON?
Yes
Is power of SUB PCB
On? (Check LED blinking)
Yes
Is transmission
cables between outdoor units
connected correctly?*
Yes
Is error code released
in order(Sub2 Sub1 Main)
after power reset?
Yes
End
* In order to check transmission
cables between outdoor units,
check in order as below
: PCB connectors
terminal block
transmission cables
Copyright ©2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
Error Point
Sum of indoor unit capaci-
ty exceed outdoor unit
capacity specification
Are quantity and capacity
No
of indoor units installed
same as the data of LGMV?
Yes
Adjust the capacity of indoor
and outdoor unit
No
Adjust corresponding DIP switch
No
Is main power really supplied?
(Terminal Block T-N)
Yes
Check and replace PCB,
Line Fuse, Transformer
No
Re-connect
No
Replace Main or Sub PCB
- 267 -
Main Reasons
1. 130% more than outdoor unit rated capacity
2. Wrong connection of transmission
cable/piping
3. Control error of sub outdoor unit DIP switch
4. Power supply defect of Sub unit PCB
5. Defect of outdoor unit PCB
Check transmission cables
No
between indoor and outdoor
units
No
Supply main
power again
1
2
3
Troubleshooting Guide
1
2
LGE Internal Use Only