In general, understanding the various LG mini split error codes is crucial for troubleshooting most issues affecting your air conditioning system. These error codes provide valuable information about when your air conditioner is experiencing problems and the severity of those issues.

Certain error codes may be resolved by simply powering off or resetting the air conditioner briefly, while others may necessitate a professional inspection. In some cases, component replacement may be required.

Being familiar with these error codes or having a reference guide is essential, and that's where this error code troubleshooting guide becomes valuable.

In this guide, we will cover the most common LG mini split fault codes, explain their meanings, discuss potential causes, and provide troubleshooting steps. This information will enable you to address the error code, potentially preventing a major malfunction or breakdown of your mini-split system.

LG Mini Split Error Codes Troubleshooting

Error CodeMeaningPossible CauseTroubleshooting
CH00Electrical problemPower fluctuationPower the unit off for 5 minutes
CH01/CH02Auto-Stop Protection problemOpen/shut circuit faultRequest expert inspection
CH03/E3No refrigerantRefrigerant leakageRequest expert inspection
CH05/5 flashesCommunication faultLack of power or wiring faultCheck the power supply and fix any wiring faults or loose connection
CH07Operation mode variationThe indoor and outdoor units operate in different modesChange the operating mode; reset the unit if that doesn't work
CH10Locked up motorFailed indoor fan motorReplace the fan motor
CH21High voltage compressor, or PCB faultShort-circuited compressor, bad inverter PCBReplace the compressor or PCB
Code 26Seized compressorThe compressor is not correctly connectedCheck the compressor and secure it properly
CH34OverheatingAbnormal pressure in the unit's sealed system or dirty condenser coilsShelter the AC from direct sunlight and clean dirty condenser coils
CH35Low-pressure sensor faultBlocked outdoor fan, refrigerator leak, poorly connected pressure sensor, or a bad compressor sensor or PCBClean any fan blockage and request expert inspection for the other issues
CH38Electrical fault or low refrigerantUnstable power or refrigerant leakageReset the mini split and request an expert repair if it won't reset
CH67Outdoor fan lock faultSeized outdoor fan motor or defective rotation sensor circuitInspect the outdoor fan motor for fault and replace it if you can't fix it
P2/FLFull drain panHigh humidityTurn the fan to low speed and AC to cool mode
Code E4Defrost ModeIce detected in the evaporatorWait for the AC to complete the defrost (up to 10 minutes)
Code E5Full water collectionPoor drainageDrain out the water collection tank
Code F1/F2/F3Fan ModeThe normal working of the fanNothing to fix

How to Troubleshoot Common LG Mini Split Error Codes

1. Error Code CH00


Indicating an electrical problem, the CH00 error code commonly appears on the mini split's display, particularly when there's a power fluctuation. Therefore, it's necessary to examine your unit to pinpoint the source of the problem.


Code CH00 is usually displayed on the mini-split to signal an electrical issue, particularly one related to power fluctuations. Consequently, you should inspect your unit to identify the root of the problem.

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To address this issue, unplug the mini split for approximately 5 minutes and then reconnect it. If the error code persists, it's advisable to seek the assistance of a professional inspector.

2. Error Code CH01/CH02/E1/E2


The occurrence of error codes CH01, CH02, E1, or E2 typically signifies a concern related to the mini split's auto-stop protection mechanism. This is often associated with an issue such as an open or short circuit problem that affects the pipe sensor.


The presence of error codes CH01, CH02, E1, or E2 commonly signals an issue with the mini split's auto-stop protection, frequently arising from a problem with the pipe sensor, such as an open or short circuit.


To resolve this matter, it is recommended to seek the assistance of a professional inspector to evaluate and address the pipe sensor issue.

Pros and Cons of LG Mini Split


  • Energy Efficiency
  • Zoning
  • Quiet Operation
  • Installation Flexibility


  • Upfront Cost
  • Complex Installation
  • Aesthetic Impact
  • Maintenance

Differences Between LG Mini Split and Mitsubishi Electric

Mitsubishi Electric mini-split

Mitsubishi Electric mini-split systems are known for their quiet operation. They often incorporate features like "i-see" sensors that can adjust airflow based on room occupancy and temperature, helping to maintain a more consistent and quieter environment.

LG mini-split

LG mini-split systems are typically designed to operate quietly as well, but the noise levels may vary depending on the specific model and installation.

Alternative to LG Mini Split


Gree is a Chinese manufacturer that has gained recognition for its ductless mini-split systems. They offer a wide selection of models at various price points.

3. LG Mini Split Error Codes: CH 03 or E3


The appearance of error codes CH03 or E3 on the mini split display signifies a situation where the refrigerant level has decreased significantly. This points to a substantial refrigerant leak, and one clear indication of this issue is the failure of the LG air conditioner to provide cooling.


Error codes CH03 or E3 are triggered when the mini-split system detects a substantial drop in the refrigerant level, which is indicative of a significant refrigerant leak. This leakage is often accompanied by the LG air conditioner's inability to provide cooling.


In order to address this issue, it is imperative to have your unit's refrigerant refilled. However, this is a task that should be entrusted to a professional technician with expertise in handling refrigerant-related matters.

4. LG Mini Split Error Codes CH 05 (LG Mini Split Error Codes 5 Flashes)


The appearance of error code CH05 (sometimes represented as five light flashes) indicates the presence of communication faults, either in the outdoor or indoor unit of your mini split system.


Error code CH05 is typically triggered when there is a breakdown in communication between the outdoor and indoor units. This issue can be caused by several factors, including:

  1. Failed power supply: where the unit doesn't receive power due to issues like a faulty socket, tripped breaker, or a blown fuse.
  2. Wiring faults, such as broken or loose wiring connections.


To address this problem, take the following steps:

  1. Ensure that your unit is receiving power. If the circuit breaker is tripped, reset it.
  2. Check the thermal fuse and power plug for electrical continuity using a multimeter. If either of them fails the test, replace them as necessary.

5. Error Code CH07


The CH07 error code occurs when there is a disparity in the operation mode or temperature settings between the master unit and the indoor unit of the mini-split system.


This error is typically triggered when there is a difference in temperature or operation mode settings between the master unit and the indoor unit. The units are not synchronized in terms of their settings.


To resolve this issue, follow these steps:

  1. Adjust the temperature settings on both the master and indoor units to match each other.
  2. If the error code persists, unplug the mini-split system for a few minutes to reset it. This may help clear the error code.

6. LG Mini Split Error Codes CH 10


The error code CH10 indicates a "locked up motor" situation, which occurs when the fan motor in the indoor unit fails to operate. This is typically accompanied by a single blink of the indoor LED.


The CH10 error code is triggered when the fan motor ceases to function, causing the indoor fan to become locked up. This lack of fan motor operation results in the error code, along with a single blink of the indoor LED.


To address this issue, you should replace the faulty fan motor with a new one.


Understanding LG mini split error codes and their meanings is essential for effectively troubleshooting and maintaining your air conditioning system. Each error code provides valuable information about the specific issue affecting your mini-split, allowing you to take appropriate action.

Whether it's addressing electrical problems, refrigerant issues, communication faults, temperature variations, or locked-up fan motors, knowing the cause and following the recommended troubleshooting steps can help you resolve the problem and prevent more significant malfunctions.

If the troubleshooting steps don't work, it's advisable to seek professional inspection and repair. Regular maintenance and quick response to error codes can contribute to the longevity and efficiency of your LG mini split system.


My name is Wisdom Bassey, I'm a blog content writer and graphic designer who provides support and services for brands and different companies. I'm young and versatile, A tech enthusiast. I carry out deep research on every topic I choose to write about. You can reach me through my social media handles, I'm always available and ready to connect.

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