LG MULTI V 5 Manual Book page 57

Error
Error Type Error Point
No.
50*
Master
Error No. Error Type Error Point
501
ODU 3phase power omis- Omitting one or more of
Slave1
502
sion error R,S,T input power
Omitting one or
ODU 3phase power
Slave2
50* more of R,S,T input
503
omission error
power
Slave3
504
n Error Diagnosis and Countermeasure Flow Chart
Are there any power wire No
1. Check R/S/T/N wiring conditions
connections normal?
→ Rewire them if abnormality found.
Yes
Check
R~S/S~T/T~R phase voltage is 380V±10%
Is input voltage normal?
No R~N/S~N/T~N phase voltage is 220V±10%
→ Check connection condition and wiring if power is
Yes
1. Check R~N/S~N/T~N phase voltage is
No
Is Main PCB assembly
2. Check Main PCB assemblywire
normal?
Yes
No Replace inverter PCB assembly.
INV. PCB LED display error
Yes
Recheck power and installation condition
* Measuring input voltage
* Noise filter wiring
R(L1) S(L2) T(L3) N
Copyright ©2017 LG Electronics. Inc. All right reserved.
Only for training and service purposes
112
_TROUBLE SHOOTING GUIDE BOOK
Main Reasons
Main Reasons
1. Input Voltage abnormal (R,S,T,N)
2. Check power Line connection condition
1. Input Voltage abnormal (R,S,T,N)
3. Main PCB damage
2. Check power Line connection condition
4. Inverter PCB input current sensor fault
3. Main PCB damage
4. Inverter PCB input current sensor fault
abnormal
220V±10%
disconnection and wiring
→ Reassemble if abnormality found
* Field Fault Case
* R-Phase Terminal
Changed Color.
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LGE Internal Use Only
Error No. Error Type Error Point
Error
Error Type Error Point
No.
Over-Capacity
Sum of indoor unit
(Sum of indoor
capacity exceed
51* unit capacity is
Over-Capacity
outdoor unit capac-
51*
Sum of indoor unit capaci-
more than outdoor
(Sum of indoor unit capaci-
ity specification
ty exceed outdoor unit
Master
ty is more than outdoor
capacity)
capacity specification
511
capacity)
n Error diagnosis and countermeasure flow chart
Is capacity sum of
Are quantity and capacity
No
indoor units less than
of indoor units installed
130% of outdoor unit
same as the data of LGMV?
capacity at LGMV?
Yes
Yes
Adjust the capacity of indoor
Check following
and outdoor unit
dip S/W setting is on
No
Slave1: No.6
Adjust corresponding DIP switch
Slave2: No.7
Slave3: No.6,7
Yes
Is power of Slave PCB No
Is main power really supplied?
On? (Check LED blinking)
(Terminal Block T-N)
Yes Yes
Check and replace PCB,
Line Fuse, Transformer
Is communicationmission
No
cables between outdoor units Re-connect
connected correctly?*
Yes
Is error code released
No
in order(Slave2 Slave1 Main) Replace Main or Slave PCB
➠ ➠
after power reset?
Yes
End
* In order to check communication cables between outdoor units,
check in order as below : PCB connectors terminal block
➠
Copyright ©2017 LG Electronics. Inc. All right reserved.
Only for training and service purposes
Main Reasons
1. 130% more than outdoor unit rated capacity
Main Reasons
2. Wrong connection of communication cable/
piping
1. 130% more than outdoor unit rated capacity
3. Control error of slave outdoor unit Dip 2. Wrong connection of communication
cable/piping
switch
3. Control error of slave outdoor unit Dip switch
4. Power supply defect of slave unit PCB
4. Power supply defect of slave unit PCB
5. Defect of outdoor unit PCB
5. Defect of outdoor unit PCB
No Check communication cables
between indoor and outdoor
units
No Supply main
power again
communication cables
➠
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LGE Internal Use Only
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