LG Multi V 5 - Page 68

134 135
_TROUBLE SHOOTING GUIDE BOOK _
- 150 -
Copyright ©2017 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
1. Power cable or communication
cable is not connected
2. Defect of outdoor Cycle/External
PCB
Error No. Error Type Error Point Main Reasons
Cycle controller of Master unit of
Master unit can’t receive signal
from External controller
Communication Error
between
(Main PCB → External
PCB)
145*
Master
1451
Slave1
1452
Slave2
1453
Slave3
1454
Is communication LED
(Yellow) of
External PCB on?
Is communication cable
connected correctly?
Re-connect Power cable
Re-connect communication cable
Replace External PCB
Yes
Yes
No
Is Main PCB normal
Replace Main PCB
Yes
No
No
* Measuring input voltage
* Noise filter wiring
R(L1) S(L2) T(L3) N
* The Method of checking Main PCB and External PCB (If normal, communication LED blinks)
n Error diagnosis and countermeasure flow chart
Error No. Error Type Error Point Main Reasons
145*
Communication
Error between
(Main PCB →
External PCB)
Cycle controller of
Master unit of Mas
-
ter unit can't receive
signal from External
controller
1. Power cable or communication cable is not
connected
2. Defect of outdoor Cycle/External PCB
▒
Error Diagnosis and Countermeasure Flow Chart
Error No. Error Type Error Point Main Reasons
116*
Compressor lowoil
level error
Compressor low oil
level
Continuous compressor low oil level Oil level
sensor fault
Is oil level sensor connected
properly to PCB?
Is oil level sensor
connected properly to
compressor?
Check sensor connection to external
PCB
Check sensor connection to
compressor
Replace oil level sensor
Yes
Yes
No
No
▒
Error Diagnosis and Countermeasure Flow Chart
Basic Part
Multi V 5
Intorduction
Trouble Shooting
Function Control
Back
Basic PartBasic PartBasic PartBasic Part