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