LG UU85W U74 - LG Standard Inverter Piping Diagrams

Part 4 Trouble Shooting
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6.5 Troubleshooting Indoor Error
CH 03 (No communication between cabled remote controller & indoor unit)
* 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
03 No communication between cabled
remote controller & indoor unit
Error
No.
Error Type Error Point Main Reasons
The remote controller
did not receive the sig-
nal from indoor unit
during specific time
1. Remote controller fault
2. Indoor unit PCB fault
3. Connector fault, Wrong connection
4. Communication cable problem
■ Error diagnosis and countermeasure flow chart
Checking communication
cable connection status
CN-REMO
Does the error happens
again if the remote
controller is replaced?*
Does the error occurred
when the cable of remote
controller is replaced?
Replace cabled remote
controller
Check connection &
communication cable **
Replace indoor unit PCB ***
Yes
Yes
No
No