Part 4 Trouble Shooting
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Error No.
Error Type Error Point Main Reasons
03
No communication between cabled
remote controller & indoor unit
The remote controller
did not receive the
signal 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
CN_REMO : Remote controller connection
The PCB can differ from model to model.
Check from the right source.
Checking communication cable connection status
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
* 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)
6.6 Troubleshooting Indoor Error
CH 03 (No communication between cabled remote controller & indoor unit)
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