Error No. 57 - LG Multi V5 Service Manual

ERROR CODES

Error No. 57

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
57
Communication
error between
Master: 571 outdoor unit main
PCB and inverter
Slave 1: 572
PCB.
Slave 2: 573
Are the communi-
cation cable connections
Is the inverter PCB
assembly correct?
After resetting the
power, does the error still
Recheck power and installation.
Fan Board
Communication
LED
Communication
LED
Images here are representative of system components. Actual component appearance depends on model and system type.
170
Outdoor unit inverter PCB is not receiving
signal from main PCB.
No
correct?
Yes
No
Yes
No
display?
Yes
Inverter Compressor Inverter Compressor
PCB 1
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Details
1. Bad connection between main and inverter
2. Communication wire noise effect.
3. The outdoor unit main PCB is damaged.
4. The outdoor unit inverter PCB is
1. Check communication wiring.
2. Check connections.
Replace Inverter PCB.
Replace main PCB.
Main PCB
PCB 2
Communication LED
Communication
LED
Causes
PCBs.
damaged.