LG ATNH09GRLE2 Svc Manual page 68

6.6 Troubleshooting Indoor Error
CH 03 (No communication between cabled remote controller & indoor unit)
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 unitʼs 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 unitʼs address if connected to central controller.
(All the indoor units connected should be turned on before Auto Addressing
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No
Replace cabled remote
controller
No
Check connection &
communication cable **
CN-REMO : Remote controller connection
Checking communication cable connection status
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The PCB can differ from model to model.
Check from the right source.
4. Trouble Shooting
LGE Internal Use Only