LG ACHH Series Manual page 94

Error code check
Error number Errors
Communication
defect (main
145
board, external
board)
n How to diagnose the disorder
Is the external board
Communication
LED(Yellow) ON?
Yes
Is the communication
cable correctly connected?
Yes
Is the main board
normal? [Note 1]
Yes
Replace the external board.
[Note 1] How to check the normal status of the main board and the external board
(If it is normal, communication LED blinks.)
Main board communication LED
and connector
Meaning
When external signal is
not received at the main
board due to the disorder
of the external board
No
Connect the power cable again.
No
Connect communication cable again.
No
Replace the main board.
External board communication LED
Main cause of occurrence
1. Power cable / Communication cable is not connected.
2. Outdoor unit main / external board defect
and connector
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