LG MULTI V 5 Manual Book page 56

Error No. Error Type Error Point
Error
Error Type Error Point
No.
Abnormal value of
Sensor error of low
42*
42* sensor
pressure
Master 421
Abnormal value of
(Open/Short)
Sensor error of low
Slave1 422 sensor
pressure
Slave2 423
(Open/Short)
Slave3 424
43*
Abnormal value of
Sensor error of
Master 431
Abnormal value of
43* sensor
Sensor error of high
high pressure
Slave1 432 sensor
(Open/Short)
pressure
Slave2 433
(Open/Short)
Slave3 434
n Error diagnosis and countermeasure flow chart
No
Is sensor connected
Connect sensor to PCB correctly
to PCB correctly?
Yes
After replacement of No
Replace corresponding
outdoor unit main PCB
pressure sensor
is the system normal?
Yes
END
Pressure sensor connector
High pressure sensor
Low pressure sensor
Copyright ©2017 LG Electronics. Inc. All right reserved.
Only for training and service purposes
110
_TROUBLE SHOOTING GUIDE BOOK
Main Reasons
Main Reasons
1. Bad connection of low pressure sensor
connector
2. Defect of low pressure sensor connector
1. Bad connection of low pressure sensor connector
(Open/Short)
2. Defect of low pressure sensor connector (Open/Short)
3. Defect of outdoor PCB
3. Defect of outdoor PCB
1. Bad connection of high pressure sensor
connector
1. Bad connection of high pressure sensor connector
2. Defect of high pressure sensor connector
2. Defect of high pressure sensor connector (Open/Short)
(Open/Short)
3. Defect of outdoor PCB
3. Defect of outdoor PCB
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LGE Internal Use Only
Error No. Error Type Error Point
Error No. Error Type Error Point
Sensor error of
Abnormal value of
44*
44* outdoor air tem- Sensor error of
Master 441
sensor (Open/Short) Abnormal value of
Slave1 442 outdoor air temper-
perature
sensor (Open/Short)
Slave2 443
ature
Slave3 444
Piping temperature
45* Piping temperature
sensor error of heat Abnormal value of
Abnormal value of
sensor error of heat
Master 451
45* exchanger in master exchanger in sensor
Slave1 452
sensor
master & slave out-
Slave2 453
& slave outdoor unit (Open/Short)
door unit heat (Open/Short)
Slave3 454
exchanger (A,B)
heat exchanger (A,B)
46*
Compressor suc-
Master 461
Compressor suction
Abnormal value of
Slave1 462 tion temperature Abnormal value of
46* temperature sensor sensor (Open/Short)
Slave2 463
sensor error
sensor (Open/Short)
Slave3 464
error
49*
Outdoor Unit
Outdoor Unit IPM Outdoor Unit IGBTM
Outdoor Unit IGBTM
Master 491
IGBTM
49* Temperature Sensor Temperature Sensor
Slave1 492
Temperature Sensor
Temperature
Slave2 493
Fault Open or Short Open or Short
Slave3 494
Sensor Fault
n Error diagnosis and countermeasure flow chart
No
Is sensor connected
Connect sensor to PCB correctly
to PCB correctly??
Yes
No
Is sensor value correct?* Replace sensor
Yes
* If value is 100kΩ ↑(open) or 100Ω ↓(short), error occurs
NB: Resistance value of temperature sensor change according to
Replace corresponding
temperature
outdoor unit PCB
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 No. Error Type
Error Point
Error No. Error Type Error Point
153*
Outdoor Unit
Outdoor Unit Upper Outdoor Unit Upper
Outdoor Unit Upper
Master 1531
Upper Heat
Heat Exchanger
Heat Exchanger Heat Exchanger
Slave1 1532
Exchanger
153*
Temperature Sensor
Temperature Sensor Temperature Sensor
Slave2 1533
Temperature
open or short
Fault open or short
Slave3 1534 Sensor Fault
154*
Outdoor Unit Low
Outdoor Unit Low
Outdoor Unit Low Outdoor Unit Low
Master 1541
Heat Exchanger
Heat Exchanger
Heat Exchanger Heat Exchanger
Slave1 1542
154* Temperature Sensor
Temperature Sensor
Slave2 1543 Temperature Sensor Temperature Sensor
Fault
open or short
Slave3 1544
Fault open or short
Copyright ©2017 LG Electronics. Inc. All right reserved.
Only for training and service purposes
Main Reasons
Main Reasons
1. Bad connection of air temperature connector
1. Bad connection of air temperature connector
2. Defect of air temperature connector(Open/Short)
2. Defect of air temperature connector(Open/Short)
3. Defect of outdoor PCB
3. Defect of outdoor PCB
1. Bad connection of air temperature connector
1. Bad connection of air temperature connector
2. Defect of air temperature connector(Open/Short)
2. Defect of air temperature connector(Open/Short)
3. Defect of outdoor PCB
3. Defect of outdoor PCB
1. Bad connection of air temperature connector
1. Bad connection of air temperature connector
2. Defect of air temperature connector(Open/Short)
2. Defect of air temperature connector(Open/Short)
3. Defect of outdoor PCB
3. Defect of outdoor PCB
1. Bad connection of air temperature connector
1. Bad connection of air temperature connector
2. Defect of air temperature connector(Open/Short)
2. Defect of air temperature connector(Open/Short)
3. Defect of outdoor PCB
3. Defect of outdoor PCB
: 25°C= 10kΩ : 50°C= 3.4kΩ
Main Reasons
Main Reasons
1. Temperature Sensor Connecting Fault
1. Temperature Sensor Connecting Fault
2. Temperature Sensor(Open/Short)
2. Temperature Sensor(Open/Short)
3. Main PCB Fault
3. Main PCB Fault
1. Temperature Sensor Connecting Fault
1. Temperature Sensor Connecting Fault
2. Temperature Sensor(Open/Short)
2. Temperature Sensor(Open/Short)
3. Main PCB Fault
3. Main PCB Fault
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LGE Internal Use Only
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