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Error number
Errors
Communication error
53
(indoor unit → main
(531)
board)
n How to diagnose the disorder
Is the communication cable locking
and installation status normal?
Yes
Is the communication
PCB locking status normal?
Yes
Are the number of indoor units
on LGMV and the number
of installed units correct
Yes
Check communication cable path and
installation environment again.
Indoor/outdoor unit communication part
External PCB
Meaning
When the indoor unit
signal is not received
at the outdoor unit
main board
1. Check if there is a problem in the communication line
No
2. Check if there is a welding in the middle connection
No
1. Check if there is a problem in the communication line
Set address again, and check the number of indoor units.
→ If the number of indoor units is different, check
No
Check blinking of communication PCB LED.
→ Replace PCB with no LED blinking.
Replace communication PCB, and set address again.
→ If a problem occurs, replace outdoor unit main board.
Main PCB
Main cause of occurrence
1. Communication cable is not connected
2. Disconnection or short circuit of the communication line
3. Outdoor unit main / indoor unit PCB defect
4. Middle connection fo communication line is used
(welding is not performed)
/locking/disconnection/short circuit.
→ If a problem is found, install again
part of the communication line.
→ If it is not welded, perform welding / replace
communication cable.
/locking/disconnection/short circuit.
→ If a problem is found, install again.
communication PCB.
Cases of field defects
- 79 -
Error code check
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