LG MULTI V IV ARNU12GTU 2 Series User Manual

Troubleshooting Guide
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Only for training and service purposes
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1. Bad Connection Between Comp PCB and
Comp PCB
2. Communication Wire Noise Effect
3. ODU Main PCB Damage
4. ODU Main PCB Damage
Error
No.
Error Type Error Point Main Reasons
Failing to receive inverter
signal at main PCB of
Outdoor Unit
Communication error : Main
PCB --> Comp PCB
57*
Master 571
Slave1 572
Slave2 573
Slave3 574
n Error diagnosis and countermeasure flow chart
Are there any
communication wire
connections normal?
Is Comp PCB
assembly
normal?
Is there any error
when power reset?
Recheck power and
installation condition
1. Check communication wiring conditions
2. Check connector conditions
→ Rewire them if abnormality found.
1. Replace Comp PCB
1. Replace Main PCB
Main PCB
Comp PCB
C/Box Bottom
No
No
No
Yes
Yes
Yes

LG MULTI V IV ARNU12GTU 2 Series Specifications

General

Brand	LG
Model	MULTI V IV ARNU12GTU 2 Series
Category	Air Conditioner
Language	English