LG MULTI V IV ARNU12GTU 2 Series User Manual

Troubleshooting Guide
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Copyright ©2013 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
n Error diagnosis and countermeasure flow chart
1. Bad connection of air temperature connector
2. Defect of air temperature connector(Open/Short)
3. Defect of outdoor PCB
1. Bad connection of air temperature connector
2. Defect of air temperature connector(Open/Short)
3. Defect of outdoor PCB
1. Bad connection of air temperature connector
2. Defect of air temperature connector(Open/Short)
3. Defect of outdoor PCB
1. Bad connection of air temperature connector
2. Defect of air temperature connector(Open/Short)
3. Defect of outdoor PCB
Error No. Error Type Error Point Main Reasons
Abnormal value of
sensor (Open/Short)
Abnormal value of
sensor
(Open/Short)
Abnormal value of
sensor (Open/Short)
Outdoor Unit IPM
Temperature Sensor
Open or Short
Sensor error of
outdoor air temper-
ature
Piping temperature
sensor error of heat
exchanger in
master & slave out-
door unit heat
exchanger (A,B)
Compressor suc-
tion temperature
sensor error
Outdoor Unit IPM
Temperature
Sensor Fault
44*
Master 441
Slave1 442
Slave2 443
Slave3 444
46*
Master 461
Slave1 462
Slave2 463
Slave3 464
49*
Master 491
Slave1 492
Slave2 493
Slave3 494
45*
Master 451
Slave1 452
Slave2 453
Slave3 454
Is sensor connected
to PCB correctly??
Is sensor value correct?*
Connect sensor to PCB correctly
Replace sensor
Replace corresponding
outdoor unit PCB
Yes
No
No
Yes
* If value is 100kΩ ↑(open) or 100Ω ↓(short), error occurs
NB: Resistance value of temperature sensor change according to
temperature
It is normal if value shown as below (±5% error)
Sensor of air temperature: 10°C = 20.7kΩ : 25°C= 10kΩ : 50°C= 3.4kΩ
Sensor of piping temperature: 10°C = 10kΩ : 25°C= 5Ωk : 50°C= 1.8kΩ
1. Temperature Sensor Connecting Fault
2. Temperature Sensor(Open/Short)
3. Main PCB Fault
1. Temperature Sensor Connecting Fault
2. Temperature Sensor(Open/Short)
3. Main PCB Fault
Error No.
Error Type
Error Point
Main Reasons
Outdoor Unit Upper
Heat Exchanger
Temperature Sensor
open or short
Outdoor Unit Low
Heat Exchanger
Temperature Sensor
open or short
Outdoor Unit
Upper Heat
Exchanger
Temperature
Sensor Fault
Outdoor Unit Low
Heat Exchanger
Temperature Sensor
Fault
153*
Master 1531
Slave1 1532
Slave2 1533
Slave3 1534
154*
Master 1541
Slave1 1542
Slave2 1543
Slave3 1544

LG MULTI V IV ARNU12GTU 2 Series Specifications

General

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