LG R410A Service Manual page 170

Troubleshooting Guide
Error
Error Contents
Code
Communication
error (Inverter
52
PCB ' Main PCB )
I Defect inspection method
1) Check whether the communication cable connection is normal.
Otherwise, check the communication cable and replace if required.
2) Check whether the Outdoor Main /inverter PCB is working on power input
Check whether the PCB orange color LED is blinking.
(if the power input and the communication is normal then the LED is blinking)
3) Check the outdoor Main / inverter PCB and replace the PCB if required .
Communication connector &
LED in the main PCB
170 Outdoor Unit
Meaning
The inverter PCB cannot
receive the signal from the
Main PCB
Main Causes
1. Power line or the communication
line is not connected
2. Communication cable is
Open/Short
3. Outdoor main fuse is damaged
4. Defective outdoor Main/inverter
PCB.
Communication connector &
LED in the inverter PCB
Error display
position
Concerned
Remote
Controller
Outdoor unit