LG Multi V Service Manual

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

LG Multi V Specifications

General

Type	VRF (Variable Refrigerant Flow)
Compressor Type	Scroll
Refrigerant	R410A
Energy Efficiency	High
Control System	Centralized and individual control options
Indoor Units	Multiple types available (e.g., ceiling cassette, wall-mounted, ducted)