Troubleshooting Guide
- 109 -
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Only for training and service purposes
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1. 130% more than outdoor unit rated capacity
2. Wrong connection of communication
cable/piping
3.
Control error of slave outdoor unit Dip switch
4. Power supply defect of slave unit PCB
5. Defect of outdoor unit PCB
Error
No.
Error Type Error Point Main Reasons
Sum of indoor unit capaci-
ty exceed outdoor unit
capacity specification
Over-Capacity
(Sum of indoor unit capaci-
ty is more than outdoor
capacity)
51*
Master
511
n Error diagnosis and countermeasure flow chart
Is capacity sum of
indoor units less than
130% of outdoor unit
capacity at LGMV?
No
Yes
Check following
dip S/W setting is on
Slave1: No.6
Slave2: No.7
Slave3: No.6,7
No
Adjust corresponding DIP switch
Yes
Is power of Slave PCB
On? (Check LED blinking)
Yes
No
Are quantity and capacity
of indoor units installed
same as the data of LGMV?
Yes
Adjust the capacity of indoor
and outdoor unit
No
Check communication cables
between indoor and outdoor
units
Is main power really supplied?
(Terminal Block T-N)
Yes
No
Supply main
power again
Is communicationmission
cables between outdoor units
connected correctly?*
Check and replace PCB,
Line Fuse, Transformer
No
Re-connect
Yes
Is error code released
in order(Slave2
➠
Slave1
➠
Main)
after power reset?
No
Replace Main or Slave PCB
Yes
End
* In order to check communication cables between outdoor units,
check in order as below : PCB connectors
➠
terminal block
➠
communication cables
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