LG Mini Split Error Codes

LG mini-split air conditioning systems are known for their efficiency and cooling capabilities. However, like any complex machine, they can encounter issues from time to time. LG has incorporated a diagnostic feature into their mini-split systems that display error codes to help users identify and resolve problems. In this guide, we will explore common LG mini-split error codes and their meanings, along with troubleshooting steps to address these issues.

Understanding LG Mini Split Error Codes


When you encounter an error code on your LG mini-split system, follow these general troubleshooting steps:

  1. Power Cycle: Turn off the unit and unplug it for a few minutes. Then, plug it back in and turn it on. Sometimes, a simple reset can resolve minor issues.
  2. Check for Obstructions: Ensure there are no obstructions around the indoor and outdoor units that may restrict airflow.
  3. Clean the Filters: Dirty filters can affect the system’s performance. Clean or replace filters regularly according to the manufacturer’s recommendations.
  4. Inspect Wiring: Carefully examine the wiring connections between the indoor and outdoor units. Ensure they are secure and undamaged.
  5. Temperature Sensors: If the error code relates to temperature sensors, check their placement and wiring. Replace them if they appear faulty.
  6. Refrigerant Levels: Low refrigerant levels can cause cooling problems. Consult a professional technician to check and refill refrigerant as needed.
  7. Professional Assistance: If the issue persists after attempting these troubleshooting steps, it’s best to contact a certified technician with experience in LG mini-split systems. They can diagnose and repair more complex problems.

LG Mini Split Error Codes

Error CodeDescriptionCauseSolution
E1Communication ErrorPoor connection or damaged wiringCheck wiring connections
E2High-Pressure ErrorExcessive refrigerant pressureInspect for refrigerant leaks
E3Low-Pressure ErrorInsufficient refrigerant pressureCheck for refrigerant charge
E4Inverter Comms ErrorCommunication issue with the inverterInspect inverter connections
E5Room Temperature Sensor ErrorFaulty room temperature sensorReplace the sensor
E6Indoor Fan Motor ErrorIndoor fan motor malfunctionCheck the motor and wiring
E7Outdoor Fan Motor ErrorOutdoor fan motor malfunctionCheck the motor and wiring
E8Water Drain ErrorWater drainage issueClear clogs and check drainage
E9EEPROM ErrorMemory chip errorReplace the memory chip
E10Discharge Temperature ErrorHigh discharge temperatureCheck for airflow restrictions
E11Communication ErrorCommunication issue with the outdoor unitCheck communication wiring
E12Inverter ErrorInverter malfunctionInspect the inverter
E13Indoor PCB ErrorIndoor PCB malfunctionCheck and replace the PCB
E14Outdoor PCB ErrorOutdoor PCB malfunctionCheck and replace the PCB
E15DC Comms ErrorDC communication errorCheck DC wiring and connections
E16Inverter Comms ErrorCommunication issue with inverterInspect inverter connections
E17EEPROM ErrorMemory chip errorReplace the memory chip
E18Low Voltage ErrorLow voltage supplyCheck power supply voltage
E19AC Voltage ErrorHigh or low AC voltageCheck AC voltage levels
E20EEPROM Copy ErrorMemory chip copy errorReplace the memory chip
E21CT ErrorCurrent transformer errorCheck current transformer
E22DC Link Voltage ErrorDC link voltage issueCheck DC voltage levels
E23Compressor Temp ErrorCompressor temperature errorCheck compressor temperature
E24IPM ErrorIPM (Intelligent Power Module) errorCheck and replace the IPM
E25Inverter Temp ErrorInverter temperature errorCheck inverter temperature
E26PFC Temp ErrorPFC (Power Factor Correction) temp errorCheck PFC temperature
E27Compressor ErrorCompressor malfunctionInspect and replace the compressor
E28Comms ErrorCommunication issueCheck communication wiring
E29EEPROM ErrorMemory chip errorReplace the memory chip
E30High Discharge Temp ErrorVery high discharge temperatureCheck for airflow restrictions
E31CT2 ErrorCurrent transformer 2 errorCheck current transformer
E32Discharge Pipe Temp ErrorHigh discharge pipe temperatureCheck for airflow restrictions
E33Capillary Tube Temp ErrorHigh capillary tube temperatureCheck for refrigerant issues
E34DC Voltage ErrorDC voltage issueCheck DC voltage levels
E35Discharge Temp ErrorHigh discharge temperatureCheck for airflow restrictions
E36Outdoor Unit Fan ErrorOutdoor unit fan malfunctionCheck the fan motor and wiring
E37High Current ErrorHigh current supplyCheck electrical connections
E38Compressor Start ErrorCompressor start errorCheck compressor and connections
E39EEPROM ErrorMemory chip errorReplace the memory chip
E40Power Factor ErrorLow power factorCheck electrical connections
E41Inverter Overcurrent ErrorInverter overcurrentCheck inverter and connections
E42AC Current Sensor ErrorAC current sensor malfunctionCheck the sensor and wiring
E43Fan Motor ErrorFan motor malfunctionCheck the fan motor and wiring
E44AC Voltage Sensor ErrorAC voltage sensor malfunctionCheck the sensor and wiring
E45AC Comms ErrorAC communication issueCheck AC communication wiring
E46IPM Overcurrent ErrorIPM overcurrentCheck the IPM and connections
E47Inverter Temp Sensor ErrorInverter temperature sensor errorCheck the sensor and wiring
E48CT2 ErrorCurrent transformer 2 errorCheck current transformer
E49Compressor Communication ErrorCompressor communication issueCheck compressor wiring

Additional Tips and Precautions for LG Mini Split Error Codes

While troubleshooting LG mini-split error codes, consider the following additional tips and precautions to ensure a safe and effective resolution:

  1. Read the User Manual: Always refer to your LG mini-split system’s user manual for specific error code meanings and troubleshooting instructions. LG often provides detailed guidance on resolving common issues.
  2. Safety First: Prioritize safety when working with your mini-split system. Turn off the power supply to the unit before attempting any troubleshooting or maintenance tasks. Use appropriate safety equipment and tools.
  3. Regular Maintenance: To prevent error codes and ensure the longevity of your mini-split system, adhere to a regular maintenance schedule. Clean or replace filters, clear debris from the outdoor unit, and inspect the system for signs of wear.
  4. Avoid DIY Refrigerant Work: Handling refrigerant is a specialized task that requires certification. If your error code suggests refrigerant-related issues, such as low levels or leaks, do not attempt to fix this yourself. Refrigerant work should be left to trained technicians to avoid safety hazards and environmental harm.
  5. Professional Servicing: While basic troubleshooting can resolve some issues, more complex problems, such as compressor or control board failures, require professional servicing. Attempting to repair these components without the necessary expertise may worsen the problem and void your warranty.
  6. Keep Records: Maintain a record of error codes, their occurrences, and any actions taken. This information can be valuable when discussing the issue with a technician or contacting LG customer support.
  7. Warranty Coverage: If your mini-split system is still under warranty, be aware that attempting repairs on your own might void the warranty. Check your warranty terms and contact LG for authorized service providers.
  8. Regularly Update Software: Some modern LG mini-split systems have firmware that can be updated to resolve certain issues. Check LG’s website or contact customer support to ensure your system has the latest software updates.
  9. Professional Maintenance Contracts: Consider signing up for a professional maintenance contract with an authorized LG service provider. They can perform routine maintenance and catch potential issues before they result in error codes or system failures.

In summary, addressing LG mini-split error codes involves a combination of understanding the error, following prescribed troubleshooting steps, and taking appropriate precautions. By staying informed, conducting regular maintenance, and seeking professional assistance when needed, you can ensure your LG mini-split system continues to provide efficient and reliable cooling and heating for your space.

Leave a Comment