LG MULTI V Service Manual page 129

Error
Error Type
No.
Communication error
52 between
(Inv. PCB ➔ Main PCB)
n Error diagnosis and countermeasure flow chart
Is communication
LED (Yellow) of
Inv. PCB on?
Yes
Is communication cable
connected correctly?
Yes
Is Main PCB normal?
Yes
Replace Inv. PCB
* The method of checking Main PCB and Inv. PCB (If normal, communication LED blinks)
Inverter Communication LED
Error Point
Main PCB of Master unit
of Master unit can't
receive signal from Inv.
PCB
No
Re-connect communication cable
No
Re-connect communication cable
No
Replace Main PCB
Inverter Communication Connector
1. Power cable or communication cable is not
connected
2. Defect of outdoor Main PCB or Inv. PCB
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Self-diagnosis function
Main Reasons