LG Multi V 5 - Page 56

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_TROUBLE SHOOTING GUIDE BOOK _
Error No. Error Type Error Point Main Reasons
44*
Sensor error of
outdoor air tem
-
perature
Abnormal value of
sensor (Open/Short)
1. Bad connection of air temperature connector
2. Defect of air temperature connector(Open/Short)
3. Defect of outdoor PCB
45*
Piping temperature
sensor error of heat
exchanger in master
& slave outdoor unit
heat exchanger (A,B)
Abnormal value of
sensor
(Open/Short)
1. Bad connection of air temperature connector
2. Defect of air temperature connector(Open/Short)
3. Defect of outdoor PCB
46*
Compressor suction
temperature sensor
error
Abnormal value of
sensor (Open/Short)
1. Bad connection of air temperature connector
2. Defect of air temperature connector(Open/Short)
3. Defect of outdoor PCB
49*
Outdoor Unit IPM
Temperature Sensor
Fault
Outdoor Unit IGBTM
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
Error No. Error Type Error Point Main Reasons
153*
Outdoor Unit Upper
Heat Exchanger
Temperature Sensor
Fault
Outdoor Unit Upper
Heat Exchanger
Temperature Sensor
open or short
1. Temperature Sensor Connecting Fault
2. Temperature Sensor(Open/Short)
3. Main PCB Fault
154*
Outdoor Unit Low
Heat Exchanger
Temperature Sensor
Fault
Outdoor Unit Low
Heat Exchanger
Temperature Sensor
open or short
1. Temperature Sensor Connecting Fault
2. Temperature Sensor(Open/Short)
3. Main PCB Fault
- 127 -
Copyright ©2017 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 IGBTM
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
IGBTM
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
- 126 -
Copyright ©2017 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 low pressure sensor connector
2.
Defect of low pressure sensor connector (Open/Short)
3. Defect of outdoor PCB
1. Bad connection of high pressure sensor connector
2.
Defect of high pressure sensor 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)
Sensor error of low
pressure
Sensor error of high
pressure
42*
Master 421
Slave1 422
Slave2 423
Slave3 424
43*
Master 431
Slave1 432
Slave2 433
Slave3 434
Is sensor connected
to PCB correctly?
Connect sensor to PCB correctly
Yes
No
No
After replacement of
outdoor unit main PCB
is the system normal?
Yes
Replace corresponding
pressure sensor
END
Pressure sensor connector
High pressure sensor
Low pressure sensor
Error No. Error Type Error Point Main Reasons
42*
Sensor error of low
pressure
Abnormal value of
sensor
(Open/Short)
1. Bad connection of low pressure sensor
connector
2. Defect of low pressure sensor connector
(Open/Short)
3. Defect of outdoor PCB
43*
Sensor error of
high pressure
Abnormal value of
sensor
(Open/Short)
1. Bad connection of high pressure sensor
connector
2. Defect of high pressure sensor connector
(Open/Short)
3. Defect of outdoor PCB
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