LG MULTI V M ARNU07GTU 4 Series Svc Manual page 53

Error
Error Type
No.
03 No communication between cabled
remote controller & indoor unit
n Error diagnosis and countermeasure flow chart
Does the error happens
again if the remote
controller is replaced?*
Yes
Does the error occurred
when the cable of remote
controller is replaced?
Yes
Replace indoor unit PCB ***
* If there is no remote controller to replace : Use another unit's remote controller doing well
** Check cable : Contact failure of connected portion or extension of cable are main cause
Check any surrounded noise ( check the distance with main power cable)
' make safe distance from the devices generate electromagnetic wave
*** After replacing indoor unit PCB, do Auto Addressing & input unit's address if connected to central controller.
(All the indoor units connected should be turned on before Auto Addressing
Error Point
The remote controller
did not receive the
signal from indoor unit
during specific time
No
Replace cabled remote
controller
No
Check connection &
communication cable **
CN-REMO : Remote controller connection
❇
Checking communication cable connection status
- 53 -
1. Remote controller fault
2. Indoor unit PCB fault
3. Connector fault, Wrong connection
4. Communication cable problem
The PCB can differ from model to model.
Check from the right source.
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Troubleshooting Guide
Main Reasons