LG VRF Error Codes – Multi V (and How to Fix Them)

LG is one of the leading multinational companies based in South Korea. What started as a small venture has now turned into a billion-dollar empire that focuses on a wide range of technology-based sectors. Offering customers all that they can need from air conditioning, TVs, washing machines, to state-of-the-art AI systems. Making sure you get a quality built and desirable appliance that enhances your everyday life.

LG VRF is said to be one of the most powerful and versatile air conditioners, offering you a cost-effective and easy-to-install a system that will help you eradicate all your issues. Offering both indoor and outdoor units, it can help you set up the right way. Their VRF system is designed to help you minimize efficiency losses while providing you sustainable energy benefits. Additionally, it aims to provide you with comfort, reliability, energy efficiency, and smart solutions for your space.

With such a huge system comes a chance of error in function. Fortunately, the system offers you with specific error codes you can use to regain effective working. Start by noting down the error code, and match it using the list below. Once you have the error code you can easily work your way to the fix. To help you out we have listed down some of the most common error codes for LG VRF.

Codes List

  1. Indicate different types of unit failures, assist in self-diagnosis and to track the frequency of occurrence.
  2. Error codes are shown on the LED of indoor units, wired remote controller, the outdoor unit control board, and on the main screen of the LG Monitoring View (LGMV) Diagnostic Software.
  3. If two or more errors occur simultaneously, the lower error code number is displayed first.
  4. After error is resolved, the error code does not display.

Error Display;

The first, second, and third number on the LED indicates error number; the fourth number on LED indicates outdoor unit number.

Examples: 211 = Error No. 21 on master unit, 213 = Error No. 21 on slave2 unit, Error No. 105 on master unit on compressor 1.

Error Code Nomenclature Definitions;

  1. MICOM: Non-volatile memory chip where unit setup information is stored.
  2. EPROM: Non-volatile memory chip where device identification, size, and factory defined default component operating parameters are stored.
Error CodesDescription
01Indoor unit return air or optional remote wall temperature sensor communications error
02Indoor unit inlet pipe temperature sensor communication error
03Communication error between zone controller and indoor unit
04Condensate float switch error
05Communication error between outdoor unit and indoor unit
06Indoor unit outlet pipe temperature sensor error
07Indoor units are not operating in the same mode
09Indoor unit EPROM error
10Indoor unit BLDC fan motor communications error
211Master outdoor unit inverter compressor PCB error
212Slave1 outdoor unit inverter compressor PCB error
213Slave2 outdoor unit inverter compressor PCB error
221Master outdoor unit inverter board input overcurrent (RMS) error
222Slave1 outdoor unit inverter board input overcurrent (RMS) error
223Slave2 outdoor unit inverter board input overcurrent (RMS) error
231Low DC voltage sensed at the master outdoor unit inverter compressor DC link
232Low voltage to the slave1 outdoor unit inverter compressor DC link
233Low voltage to the slave2 outdoor unit inverter compressor DC link
241Master outdoor unit high pressure switch error
242Slave1 outdoor unit high pressure switch error
243Slave2 outdoor unit high pressure switch error
251Input voltage to the master outdoor unit is too high or too low
252Input voltage to the slave1 outdoor unit is too high or too low
253Input voltage to the slave2 outdoor unit is too high or too low
261Master outdoor unit inverter compressor operation error
262Slave1 outdoor unit inverter compressor operation error
263Slave2 outdoor unit inverter compressor operation error
281Master outdoor unit inverter DC link high voltage error
282Slave1 outdoor unit inverter DC link high voltage error
LG VRF Error Codes
LG VRF Error Codes

Other Codes

  • 283 Slave2 outdoor unit inverter DC link high voltage error
  • 291 Master outdoor unit inverter compressor overcurrent error
  • 292 Slave1 outdoor unit inverter compressor overcurrent error
  • 293 Slave2 outdoor unit inverter compressor overcurrent error
  • 321 Excessive increase in master outdoor unit inverter com- pressor1 gas discharge temperature
  • 322 Excessive increase in slave1 outdoor unit inverter com- pressor1 gas discharge temperature
  • 323 Excessive increase in slave2 outdoor unit inverter com- pressor1 gas discharge temperature
  • 331 Excessive increase in master outdoor unit inverter com- pressor2 gas discharge temperature
  • 332 Excessive increase in slave1 outdoor unit inverter com- pressor2 gas discharge temperature
  • 333 Excessive increase in slave2 outdoor unit inverter com- pressor2 gas discharge temperature
  • 341 Master outdoor unit compressor high pressure safety tripped
  • 342 Slave1 outdoor unit compressor high pressure safety tripped
  • 343 Slave2 outdoor unit compressor high pressure safety tripped
  • 351 Master outdoor unit low side pressure transducer sens- es pressure below allowable limits
  • 352 Slave1 outdoor unit low side pressure transducer sens- es pressure below allowable limits
  • 353 Slave1 outdoor unit low side pressure transducer sens- es pressure below allowable limits
  • 361 Master outdoor unit fell below low condenser (compression) ratio limit
  • 362 Slave1 outdoor unit fell below low condenser (compression) ratio limit
  • 363 Slave2 outdoor unit fell below low condenser (com- pression) ratio limit
  • 401 Master outdoor unit inverter compressor current trans- ducer (CT) sensor error
  • 402 Slave1 outdoor unit inverter compressor current trans- ducer (CT) sensor error
  • 403 Slave2 outdoor unit inverter compressor current trans- ducer (CT) sensor error
  • 411 Master outdoor unit inverter compressor1 discharge pipe temperature sensor error
  • 412 Slave1 outdoor unit inverter compressor1 discharge pipe temperature sensor error
  • 413 Slave2 outdoor unit inverter compressor1 discharge pipe temperature sensor error.
  • 421 Master outdoor unit low pressure transducer error
  • 422 Slave1 outdoor unit low pressure transducer error
  • 423 Slave2 outdoor unit low pressure transducer error
  • 431 Master outdoor unit high pressure transducer error
  • 432 Slave1 outdoor unit high pressure transducer error
  • 433 Slave2 outdoor unit high pressure transducer error
  • 441 Master outdoor unit ambient temperature sensor error
  • 442 Slave1 outdoor unit ambient temperature sensor error
  • 443 Slave2 outdoor unit ambient temperature sensor error
  • 451 Master outdoor unit heat exchanger pipe temperature sensor (front side, TH_HEX2) error
  • 452 Slave1 outdoor unit heat exchanger pipe temperature sensor (front side, TH_HEX2) error
  • 453 Slave2 outdoor unit heat exchanger pipe temperature sensor (front side, TH_HEX2) error
  • 461 Master outdoor unit suction pipe temperature sensor error
  • 462 Slave1 outdoor unit suction pipe temperature sensor error
  • 463 Slave2 outdoor unit suction pipe temperature sensor error
  • 471 Master outdoor unit inverter compressor2 discharge temperature sensor error
  • 472 Slave1 outdoor unit inverter compressor2 discharge temperature sensor error
  • 473 Slave2 outdoor unit inverter compressor2 discharge temperature sensor error
  • 491 Master outdoor unit IPM temperature sensor error
  • 492 Slave1 outdoor unit IPM temperature sensor error
  • 493 Slave2 outdoor unit IPM temperature sensor error
  • 501 Master outdoor unit three-phase power is not connected properly
  • 502 Slave1 outdoor unit three-phase power is not connected properly
  • 503 Slave2 outdoor unit three-phase power is not connected properly
  • 511 Combination ratio is out of range
  • 512 Total indoor unit capacity exceeds allowable heat recovery unit branch capacity
  • 521 Communication error between master outdoor unit inverter PCB and main PCB
  • 522 Communication error between slave1 outdoor unit inverter PCB and main PCB
  • 523 Communication error between slave2 outdoor unit inverter PCB and main PCB
  • 531 Communication error between outdoor unit main PCB and indoor unit(s) PCB
  • 541 Master outdoor unit power error
  • 542 Slave1 outdoor unit power error
  • 543 Slave2 outdoor unit power error
  • 571 Master outdoor unit main PCB and inverter PCB communication error
  • 572 Slave1 outdoor unit main PCB and inverter PCB communication error
  • 573 Slave2 outdoor unit main PCB and inverter PCB communication error
  • 591 Outdoor unit series installation error
  • 601 Master outdoor unit inverter PCB EPROM error
  • 602 Slave1 outdoor unit inverter PCB EPROM error
  • 603 Slave2 outdoor unit inverter PCB EPROM error
  • 621 High temperature at the master outdoor unit inverter heatsink
  • 622 High temperature at the slave1 outdoor unit inverter heatsink
  • 623 High temperature at the slave2 outdoor unit inverter heatsink
  • 651 Master outdoor unit inverter heatsink temperature sensor error
  • 652 Slave1 outdoor unit inverter heatsink temperature sensor error
  • 653 Slave2 outdoor unit inverter heatsink temperature sensor error
  • 671 Master outdoor unit fan has locked up
  • 672 Slave1 outdoor unit fan has locked up
  • 673 Slave2 outdoor unit fan has locked up
  • 711 Master outdoor unit converter CT sensor error
  • 712 Slave1 outdoor unit converter CT sensor error
  • 713 Slave2 outdoor unit converter CT sensor error
  • 751 Master outdoor unit fan CT sensor error
  • 752 Slave1 outdoor unit fan CT sensor error
  • 753 Slave2 outdoor unit fan CT sensor error
  • 761 Master outdoor unit fan DC link high voltage error
  • 762 Slave1 outdoor unit fan DC link high voltage error
  • 763 Slave2 outdoor unit fan DC link high voltage error
  • 771 Master outdoor unit fan overcurrent error
  • 772 Slave1 outdoor unit fan overcurrent error
  • 773 Slave2 outdoor unit fan overcurrent error
  • 791 Master outdoor unit fan operation failure error
  • 792 Slave1 outdoor unit fan operation failure error
  • 793 Slave2 outdoor unit fan operation failure error
  • 861 Master outdoor unit main PCB onboard EPROM error
  • 862 Slave1 outdoor unit main PCB onboard EPROM error
  • 863 Slave2 outdoor unit main PCB onboard EPROM error
  • 871 Master outdoor unit fan PCB EPROM error
  • 872 Slave1 outdoor unit fan PCB EPROM error
  • 873 Slave2 outdoor unit fan PCB EPROM error
  • 1041 Communication error between master outdoor unit and slave outdoor units
  • 1042 Communication error between slave1 outdoor unit and master and slave2 outdoor units
  • 1043 Communication error between slave2 outdoor unit and master and slave1 outdoor units
  • 1051 Master outdoor unit fan PCB to compressor PCB communication error
  • 1052 Slave1 outdoor unit fan PCB to compressor PCB communication error
  • 1053 Slave2 outdoor unit fan PCB to compressor PCB communication error
  • 1061 Master outdoor unit fan IPM error
  • 1062 Slave1 outdoor unit fan IPM error
  • 1063 Slave2 outdoor unit fan IPM error
  • 1071 Master outdoor unit fan DC link low voltage error
  • 1072 Slave1 outdoor unit fan DC link low voltage error
  • 1073 Slave2 outdoor unit fan DC link low voltage error
  • 1131 Master outdoor unit liquid pipe temperature sensor error
  • 1132 Slave1 outdoor unit liquid pipe temperature sensor error
  • 1133 Slave2 outdoor unit liquid pipe temperature sensor error
  • 1141 Master outdoor unit subcooling inlet temperature sensor error
  • 1142 Slave1 outdoor unit subcooling inlet temperature sensor error
  • 1143 Slave2 outdoor unit subcooling inlet temperature sensor error
  • 1151 Master outdoor unit subcooling outlet temperature sensor error
  • 1152 Slave1 outdoor unit subcooling outlet temperature sensor error
  • 1153 Slave2 outdoor unit subcooling outlet temperature sensor error
  • 1161 Master outdoor unit oil level sensor error
  • 1162 Slave1 outdoor unit oil level sensor error
  • 1163 Slave2 outdoor unit oil level sensor error
  • 1451 Communication error between master outdoor unit main board and external board
  • 1452 Communication error between slave1 outdoor unit main board and external board
  • 1453 Communication error between slave2 outdoor unit main board and external board
  • 1511 Master outdoor unit operation mode conversion error
  • 1512 Slave1 outdoor unit operation mode conversion error
  • 1513 Slave2 outdoor unit operation mode conversion error
  • 1531 Master outdoor unit upper heat exchanger temperature sensor error
  • 1532 Slave1 outdoor unit upper heat exchanger temperature sensor error
  • 1533 Slave2 outdoor unit upper heat exchanger temperature sensor error
  • 1541 Master outdoor unit lower heat exchanger temperature sensor error
  • 1542 Slave1 outdoor unit lower heat exchanger temperature sensor error
  • 1543 Slave2 outdoor unit lower heat exchanger tempera- ture sensor error
  • 1821 Communication error between master outdoor unit external board main and sub MICOMs
  • 1822 Communication error between slave1 outdoor unit external board main and sub MICOMs
  • 1823 Communication error between slave2 outdoor unit external board main and sub MICOMs
  • 1931 Excessive increase in master outdoor unit fan heatsink temperature
  • 1932 Excessive increase in slave1 outdoor unit fan heat- sink temperature
  • 1933 Excessive increase in slave2 outdoor unit fan heat- sink temperature
  • 1941 Master outdoor unit fan heatsink temperature sensor error
  • 1942 Slave1 outdoor unit fan heatsink temperature sensor error
  • 1943 Slave2 outdoor unit fan heatsink temperature sensor error
  • 2001 Valve addressing error
  • 2011 Heat recovery unit liquid sensor error.
  • 2021 Heat recovery unit subcooling pipe inlet sensor error
  • 2031 Heat recovery unit subcooling pipe outlet sensor error
  • 2041 Communication error between outdoor unit and heat recovery unit
  • 2051 Communication error between heat recovery unit and the 485 modem
  • 2061 Duplicate address error of the heat recovery unit
  • 51 Capacity of indoor units connected to the heat recovery unit exceeds allowable limits

Note: To use open line 485 communication (9,600 bps communication), you need to use a product that is compatible with all of the “Generation 4” versions of the indoor units, heat recovery units, outdoor units, and accessories.

Q&A

CH50

Description: Outdoor unit three-phase power is not connected properly.

Details: One or more of R(L1), S(L2), T(L3) input power line connections is / are missing for the outdoor unit.

Causes:
1. Input voltage is not correct R(L1), S(L2), T(L3).
2. Power line connections may not be correct.
3. Main PCB may be damaged.
4. Inverter PCB input current sensor error.

LG Multi V Outdoor Units Types Error Codes
LG Multi V Indoor Units Types Error Codes

Manuals Pdf

LG Multi V Service Manual PDF

LG Multi V 5 Service Manual – VRF (Variable Refrigerant Flow) Outdoor Units 6.0 to 42.0 Tons.pdf

LG Multi V 4 Service Manual – Heat Pump and Heat Recovery Variable Refrigerant Flow Outdoor Units 6.0 to 42.0 Tons.pdf

Lg AC Error Codes

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68 thoughts on “LG VRF Error Codes – Multi V (and How to Fix Them)”

  1. Hi…I am getting error code CH230 in my Thermostat CRC1.
    My Fan Coil ARNU243BHA4 is not responding, my Fan blower also is not responding
    can you help me with this please
    Thanks in avance

    Reply

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