Troubleshooting LG Mini Split Error Codes

If you own an LG mini split air conditioning system, knowing how to troubleshoot LG mini split error codes can be your ticket to resolving most issues. These error codes not only signal when something’s amiss with your AC system but also indicate the severity of the problem.

This informative guide outlines common LG mini-split error codes, their meanings, and troubleshooting steps. These codes can signal issues ranging from electrical problems to refrigerant leaks. While some can be resolved through simple actions like resetting the unit, others may require professional assistance. Understanding these error codes helps ensure the efficient operation of your LG mini-split system.

In many cases, a quick power cycle or reset can do the trick, while others may necessitate professional intervention or even component replacements. That’s why it’s crucial to familiarize yourself with these error codes or have a handy reference, which is precisely what this error code troubleshooting guide aims to provide.

In this guide, we’ll delve into the most common LG mini split fault codes, unravel their meanings, explore potential causes, and walk you through troubleshooting steps. Armed with this knowledge, you’ll be equipped to tackle error codes head-on, ensuring your mini-split continues to run smoothly and avoiding costly breakdowns.

Now, let’s dive into the world of LG mini split error codes and fix these issues.

LG mini split error codes

Troubleshooting Guide to LG Mini Split Error Codes

Error CodeError DescriptionPotential CausesTroubleshooting Steps
1. CH00Electrical AnomalyFluctuations in power supplyPower off the unit for 5 minutes
2. CH01/CH02Auto-Stop Protection ProblemOpen or short-circuit faultsRequest expert inspection
3. CH03/E3Refrigerant DepletionLeakage in refrigerantSeek professional assessment
4. CH05/5 flashesCommunication BreakdownPower deficiency or wiring issuesExamine power supply and rectify wiring faults
5. CH07Operation Mode VariationIndoor and outdoor units running in different modesAdjust operating mode or attempt a unit reset
6. CH10Locked Up MotorMalfunctioning indoor fan motorReplace the fan motor
7. CH21High Voltage Compressor or PCB FaultShort-circuited compressor or faulty inverter PCBReplace compressor or PCB
8. Code 26Seized CompressorIncorrect compressor connectionInspect and secure the compressor properly
9. CH34OverheatingAbnormal sealed system pressure or dirty condenser coilsProtect AC from direct sunlight and clean condenser coils
10. CH35Low-Pressure Sensor FaultObstructed outdoor fan, refrigerant leak, poorly connected pressure sensor, or defective compressor sensor or PCBRemove fan blockage and request expert inspection for other issues
11. CH38Electrical Fault or Low RefrigerantUnstable power supply or refrigerant leakReset the mini split and request expert repair if necessary
12. CH67Outdoor Fan Lock FaultSeized outdoor fan motor or malfunctioning rotation sensor circuitInspect the outdoor fan motor for faults and replace it if required
13. P2/FLFull Drain PanHigh humiditySet the fan to low speed and switch the AC to cooling mode
14. Code E4Defrost ModeDetection of ice in the evaporatorWait for the AC to complete the defrost cycle (up to 10 minutes)
15. Code E5Full Water CollectionInadequate drainageEmpty the water collection tank
16. Code F1/F2/F3Fan ModeNormal operation of the fanNo specific action required
LG Mini Split Error Codes List

How to Resolve Common LG Mini Split Error Codes

Here’s how you can easily resolve LG Mini Split error codes by yourself. Have a look at the most common LG Mini Split AC fault codes:

1. CH00

Meaning: When you see Error Code CH00 on your mini-split system, it’s signaling an electrical problem, often related to power fluctuations.

Cause: Code CH00 typically appears when there’s a disruption in the electrical supply. To troubleshoot this, start by examining your unit to pinpoint the source of the problem.


  1. Begin by unplugging the mini-split from the power source and wait for about 5 minutes.
  2. Plug it back in after the brief pause.
  3. If the error code persists, it’s advisable to seek professional assistance through an expert inspection. They can diagnose and resolve the underlying electrical issue, ensuring your mini-split operates smoothly.

2. Error Code CH01/CH02/E1/E2

Meaning: When you encounter Error Code CH01, CH02, E1, or E2 on your mini-split system, it’s signaling an issue with the auto-stop protection feature. This problem is typically linked to an open or short circuit problem that affects the pipe sensor.

Cause: The presence of CH01, CH02, E1, or E2 indicates that there’s a malfunction in the auto-stop protection mechanism. This malfunction often occurs due to problems with the pipe sensor’s circuit, either being open or shorted.

Troubleshooting: To resolve this issue, it’s recommended to reach out to a professional technician for an expert inspection of the pipe sensor. They can accurately diagnose the problem and apply the necessary fixes to ensure your mini-split system functions as intended.

lg mini split error codes ch 38

3. CH 03/ Code E3

Meaning: When you come across Error Codes CH03 or E3 on your LG mini-split, it’s signaling a critical issue – a refrigerant shortage. This indicates a substantial refrigerant leak, which can be noticed when your LG air conditioner not cooling.

Cause: CH03 or E3 appear as a result of your mini-split system detecting a significant drop in refrigerant levels. This drop signifies a substantial refrigerant leak, leading to a decline in cooling performance.

Troubleshooting: Addressing this issue requires professional assistance. It’s crucial to have your unit’s refrigerant levels replenished, but this task should be handled by a trained technician. Reach out to a professional to diagnose the extent of the leakage and safely refill the refrigerant to restore your mini-split’s cooling efficiency.

4. LG Mini Split Error Codes CH 05 or Error Code 5 flashes

Meaning: When you encounter Error Code CH05, sometimes indicated by five light flashes on your LG mini-split, it signifies communication faults either in the outdoor or indoor unit.

Cause: CH05 occurs due to failed communication within your mini-split system. Several factors can contribute to this issue:

  • A malfunctioning power supply, often caused by a faulty socket, tripped breaker, or a defective fuse.
  • Wiring faults, which may include broken or loose wiring connections.

Troubleshooting: To address this problem, follow these steps:

  1. Ensure that your unit is receiving power. Check for a flipped-off breaker and reset it if necessary.
  2. Test the thermal fuse or power plug using a multimeter to determine if they have electrical continuity. If they fail this test, consider replacing them.

5. LG Mini Split Error Codes CH07

Meaning: Error Code CH07 indicates a disparity in the operation mode between the master unit and the indoor unit of your mini-split system.

Cause: CH07 is triggered when there’s a temperature or operation mode difference observed between the master unit and the indoor unit. This discrepancy serves as the primary cause for the error code.

Troubleshooting: To resolve this issue, follow these steps:

  1. Check and adjust the temperature settings on both the master unit and the indoor unit to ensure they match.
  2. If the error persists, unplug the mini-split from the power source for a few minutes to initiate a system reset. This may help clear the error code.

6. Error Code CH10

Meaning: Error Code CH10 indicates a locked-up motor within your LG mini-split system.

Cause: When the fan motor fails to operate, it can lead to the indoor fan locking up, triggering Error Code CH10. Additionally, you may notice a single blink from the unit’s indoor LED.

Troubleshooting: Replace the fan motor, as it is the root cause of the problem.

7. LG Mini Split Error Codes CH 21

Meaning: Error Code CH21 indicates a potential issue with either an over-voltage compressor or a malfunctioning PCB (Printed Circuit Board) within your LG mini-split system.

Cause: This error code is triggered when an excessive voltage surge occurs, possibly leading to a short-circuit in the compressor. Alternatively, it may suggest a grounded compressor or a defective PCB.

Troubleshooting: To address this issue, follow these steps:

  1. Check the compressor’s functionality. If the LG AC compressor not working correctly, consider replacing it.
  2. If the compressor is functioning correctly, replace the PCB (Printed Circuit Board) instead.
LG Mini Split Error Codes CH35

8. LG Mini Split Error Code Error Code 26

Meaning: Error Code 26 indicates a seized compressor in your LG mini-split system.

Cause: This error code is triggered when the compressor is improperly connected, resulting in it becoming seized. A seized compressor will not function until the issue is addressed.

Troubleshooting: To address this issue, follow these steps:

  1. Inspect the compressor to ensure it is correctly connected.
  2. If you find that it’s not properly connected, secure the compressor connection.
  3. If you’re uncertain or unable to resolve the issue, it’s advisable to seek the assistance of a professional expert who can ensure the correct connection of the compressor.

9. Error Code CH34

Meaning: When you see Error Code CH34 on your mini-split’s control panel, it’s indicating that the unit is overheating.

Cause: CH34 typically appears when the mini-split system experiences overheating. This can occur due to two primary reasons:

  1. An abnormal pressure within the unit’s sealed system, often caused by direct exposure to sunlight.
  2. Clogged condenser coils, hindering proper heat dissipation.

Troubleshooting: To address this issue, follow these steps:

  1. Inspect the condenser coils for dirt and debris. If they are clogged, clean them to enhance heat dissipation.
  2. If the error code reoccurs, consider providing shade for the air conditioner to protect it from direct sunlight. Installing an awning can be an effective solution.
  3. Alternatively, set the mini-split to a slightly higher temperature, especially when you are not at home. This allows the unit to better adapt to the ambient air temperature and prevent overheating.

10. LG Mini Split Error Codes CH35

Meaning: When you encounter Error Code CH35 on your LG mini-split system, it’s indicating a problem with the low-pressure sensor.

Cause: CH35 typically appears due to issues with the pressure sensor. Several potential triggers for this error include:

  1. A blocked outdoor fan obstructed by dirt, debris, or branches.
  2. Refrigerant leakage.
  3. Poorly connected pressure sensor.
  4. A malfunctioning compressor sensor.
  5. A defective control board.

Troubleshooting: To address this issue, follow these steps:

  1. Inspect the outdoor fan for blockages, such as dirt, debris, or obstructions like branches. Clear any impediments you find.
  2. If there are no obstructions, it’s advisable to seek the expertise of a professional technician. They can thoroughly inspect and address the other potential issues, ensuring the proper functioning of your mini-split system.

11. Error Code CH38

Meaning: Error Code CH38 indicates the presence of either an electrical fault, typically caused by unstable power, or low refrigerant levels within your LG mini-split system.

Cause: CH38 appears when there are underlying issues, such as:

  1. Unstable power supply leading to electrical faults.
  2. Refrigerant leakage, resulting in low refrigerant levels.

Troubleshooting: To address this issue, follow these steps:

  1. Begin by resetting your mini-split system. Unplug it from the power source for approximately 5 minutes and then reconnect it.
  2. If the error code persists after resetting, it’s essential to have a professional technician inspect the system. They can diagnose any refrigerant leakage issues and, if necessary, refill the refrigerant to ensure optimal performance.

12. LG Mini Split Error Code CH 67

Meaning: Error Code CH67 is an indication of a fault in the outdoor fan of your LG mini-split system, resulting in a fan lock fault. If it’s not the fan motor, the issue may lie with a defective rotation sensor circuit.

Cause: CH67 occurs when the outdoor fan motor becomes seized, leading to a fan lock fault. Alternatively, a malfunctioning rotation sensor circuit may trigger this error.

Troubleshooting: To address this issue, follow these steps:

  1. Examine both the fan motor and the PCB (Printed Circuit Board) for potential faults.
  2. Depending on which component is found to be faulty, you will need to replace either the fan motor or the PCB.
  3. Seek the assistance of a professional technician who can accurately diagnose the problem and perform the necessary replacement.
LG Mini Split Error Codes CH 10

13. LG Mini Split Error Codes P2/FL

Meaning: When you see Error Code FL or P2 on your mini-split, it indicates that the drain pan in your system has become full.

Cause: This error code appears when the drain pan of your mini-split fills up with water. Typically, this occurs due to high humidity levels.

Troubleshooting: To address this issue, follow these steps:

  1. Increase the air conditioner’s fan speed. This can help improve water drainage from the drain pan.
  2. Set the unit to Cool Mode. Lowering the temperature inside can reduce humidity levels.
  3. To further control humidity, consider keeping windows and doors shut, creating a more temperature-controlled indoor environment.

14. Code E4

Meaning: When you encounter Code E4 on your mini-split, it’s not a fault code but an indication that the air conditioner has entered the defrost mode. This occurs naturally as a response to detecting frost on the evaporator.

Cause: E4 is displayed when the mini-split system detects frost buildup on the evaporator, triggering the defrost mode. It’s a normal operation.

Troubleshooting: As this is not a fault code, there’s no need for active troubleshooting. Simply allow the mini-split to complete the defrost cycle, which may take up to 10 minutes. This is part of the system’s standard operation to ensure optimal performance.

15. Error Code E5

Meaning: When Error Code E5 appears on your mini-split system, it signifies that the water collection tank has reached its capacity and is not effectively draining.

Cause: E5 is displayed when the water collection tank becomes full, indicating that the water is not draining properly from the unit.

Troubleshooting: To address this issue, follow these steps:

  1. Drain out the water collection tank by carefully removing the drain cap.
  2. Allow the water to flow out completely.
  3. After draining, reinstall the drain cap securely to ensure proper functioning.

16. Code F1/F2/F3

Meaning: When you see Code F1, F2, or F3 displayed on your mini-split, it’s not indicating a fault but rather informing you that the unit is currently operating in fan mode.

Cause: F1, F2, or F3 are codes that do not represent faults. They simply indicate that the mini-split unit is running in fan mode, where the fan operates without cooling or heating.

Troubleshooting: As these codes indicate a normal fan mode operation, there is no need for troubleshooting. Your mini-split is functioning as intended in this mode.

Final Words

The LG mini-split error codes mentioned above are some of the most common ones you may come across while using your unit. This guide serves as a valuable resource to help you troubleshoot and resolve these error codes. You can also look into our LG Air Conditioner troubleshooting manual for more in-depth issues solutions. However, if these error codes persists and you find it challenging to address, it’s advisable to reach out to an HVAC professional or LG’s technical support team for expert guidance and assistance. Your comfort and the efficient operation of your mini-split system are their top priorities.

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