Error No. 52 - LG Multi V5 Service Manual

ERROR CODES

Error No. 52

Please refer to the Safety Precautions on pages 4-7 for more detail to prevent injury or death regarding the operation and service
WARNING
troubleshooting of the Multi V product.
Error No. Description
Communication
52
error between
outdoor unit in-
Master: 521
verter compressor
Slave 1: 522
PCB(s) and main
Slave 2: 523
PCB.
Is the yellow commu-
nication LED for either the
compressor1 or compressor2
PCB on?
Yes
Is the communication cable
connected properly?
Yes
Is the main PCB functioning
normally?
Yes
Replace the PCB on either compressor1
or compressor2.
Checking the Main PCB and Inverter Compressor 1 / Inverter Compressor 2 PCB (If operating normally, the communica-
tion LED will blink)
Fan Board
166
Outdoor unit main controller (PCB) cannot
receive signal from inverter compressor con-
troller (PCB[s]).
No
No
No
Inverter Compressor Inverter Compressor
PCB 1
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Details
Is the noise filter or Inverter
PCB(s) line fuse normal?
Reconnect communication
cable.
Replace Main PCB.
Main PCB
PCB 2
Causes
1. Power wiring or communication cable is
disconnected.
2. Defective outdoor unit main fuse / noise
filter.
3. Defective outdoor unit main / inverter
PCB(s).
Change the noise filter or
fuse.
Change the Inverter PCB(s).
Images here are representative
of system components. Actual
component appearance depends
on model and system type.