LG MULTI V IV ARNU07GTU 2 Series Service Manual page 107

Error No. Error Type
44*
Sensor error of
Master 441
Slave1 442 outdoor air temper-
Slave2 443
ature
Slave3 444
45* Piping temperature
sensor error of heat
Master 451
exchanger in
Slave1 452
master & slave out-
Slave2 453
door unit heat
Slave3 454
exchanger (A,B)
46*
Compressor suc-
Master 461
Slave1 462
tion temperature
Slave2 463
sensor error
Slave3 464
49*
Outdoor Unit IPM
Master 491
Slave1 492
Temperature
Slave2 493
Sensor Fault
Slave3 494
n Error diagnosis and countermeasure flow chart
Is sensor connected
to PCB correctly??
Yes
Is sensor value correct?*
Yes
Replace corresponding
outdoor unit PCB
Error No.
Error Type
153*
Outdoor Unit
Master 1531
Upper Heat
Slave1 1532
Exchanger
Slave2 1533
Temperature
Sensor Fault
Slave3 1534
154*
Outdoor Unit Low
Master 1541
Heat Exchanger
Slave1 1542
Temperature Sensor
Slave2 1543
Fault
Slave3 1544
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Error Point
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
No
Connect sensor to PCB correctly
No
Replace sensor
* 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
Sensor of piping temperature: 10°C = 10kΩ : 25°C= 5Ωk : 50°C= 1.8kΩ
Error Point
Outdoor Unit Upper
Heat Exchanger
Temperature Sensor
open or short
Outdoor Unit Low
Heat Exchanger
Temperature Sensor
open or short
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
: 25°C= 10kΩ : 50°C= 3.4kΩ
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
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Troubleshooting Guide
Main Reasons
Main Reasons
LGE Internal Use Only