LG AC Error Code List: Split, Inverter, All Codes

lg ac error codes
Rashmi Malhotra

LG air conditioners are known for their reliable performance and energy efficiency, but like any other appliance, they may encounter issues from time to time. When your LG AC displays an error code, it can be confusing and frustrating, especially if you’re unsure what the code means or how to fix it. That’s why we’ve compiled the ultimate LG AC error codes list, covering all models, including split and inverter ACs. So let’s dive in and decode those error codes! This comprehensive guide will help you quickly identify the error code displayed on your LG AC, understand its meaning, and take the necessary steps to resolve the issue. Whether you’re an Indian homeowner, a technician, or a DIY enthusiast, this resource is a must-have for anyone who wants to keep their LG AC in India running all year round smoothly.

LG AC Indoor Unit Error Codes List

LG AC Indoor Unit Error Codes List
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Error CodeDescription
1A potential error with the indoor unit room temperature sensor has been detected.
2An issue with the indoor unit inlet pipe sensor has been detected.
3A potential error has been identified with the wired remote control.
4There may be an error with the float switch.
5Communication errors between the indoor and outdoor units have been detected.
6An issue has been detected with the indoor unit outlet pipe sensor.
9There may be an error with the indoor unit EEPROM.
10A potential lock has been detected in the indoor unit BLDC fan motor.
12An issue has been identified with the indoor unit middle pipe sensor.

LG AC Outdoor Unit Error Code List

Error CodeDescription
21An error has been detected with the compressor’s DC voltage, which is too high.
22The alternating current input to CT2 (Max CT) is too high.
23The DC link voltage is too low.
25The AC voltage is either too low or too high.
26The DC compressor is not providing rotation and is locking.
27The current to the inverter compressor between the AC and DC converter is too high – PSC Fault
28The inverter compressor’s DC voltage is too high.
29The inverter compressor’s amperage is too high, indicating a phase over-current.
31The current-to-current transformer (CT) thermistor is reading too low.
32The inverter compressor’s discharge pipe is overheating.
34The high-pressure sensor is reading too high.
35The low-pressure sensor is reading too low.
36/38A refrigerant leak has been detected.
37The compression ratio limit has been exceeded.
40The CT sensor’s thermistor is disconnected or shorted out.
41The discharge pipe sensor for the inverter is disconnected or shorted out.
42The low-pressure sensor is experiencing an error.
43The high-pressure sensor is experiencing an error.
44The outdoor air sensor is disconnected or shorted out.
45The condenser middle pipe sensor is disconnected or shorted out.
46The suction pipe sensor is disconnected or shorted out.
48The outdoor unit coil outlet (liquid line) thermistor is disconnected or shorted out.
51There is a mismatch in capacity between the indoor and outdoor units.
53There is a communication error between the indoor and outdoor units.
60The outdoor unit printed circuit board (PCB) has an EEPROM checksum error.
61The condenser coil temperature is too high.
62The heat sink sensor temperature is too high.
63The condenser coil pipe thermistor temperature is too low.
65The condenser coil pipe thermistor temperature is too low.
67The BLDC motor fan is locked.
72A failure has been detected in the 4-way valve transfer.
93A communication error has occurred.

Some Other Commonly Observed Errors/Codes

1. LG AC F1, F2, F3

In the case of the F1, F2, and F3 error codes, there is no cause for concern as they simply indicate that the air conditioner is operating in fan mode, with the number corresponding to the set fan speed. These air conditioner error codes are normal and do not signify any other issues with the unit.

So, if you see the F1, F2, or F3 error code displayed on your LG air conditioner, you can rest assured that your unit is functioning as it should. You can simply adjust the fan speed setting per your preference, and the error code will disappear.

2. P2 or FL

Reason: The next error code is P2 or FL, indicating the water collection tank is full. 

Let’s take a closer look at this error code and its solutions.

This error code usually appears on the AC display panel to indicate that the drain pan in the outdoor unit is full. While the drain pan generally does not require emptying, there are certain situations where remedial action is necessary.


a) P2 or FL code keeps recurring. 

If the error code keeps recurring, you can remove the drain port cap and tilt the AC to allow the water to flow out of the drain outlet. Setting the fan speed to ‘LOW’ can help slow down air circulation and reduce the amount of moisture the unit removes. This will prevent you from having to drain the unit frequently. However, it is essential to create a controlled environment by shutting down all windows and doors to maintain the desired temperature and humidity levels.

b) P2 or FL code without the water draining out. 

Reason: If the water does not drain out on tilting the AC, it indicates that the unit requires repair service. 

Solution: You can call an AC mechanic to fix the issue.

c) P2 or FL code does not clear after draining the water. 

If the error code persists even after draining the water, it is necessary to reset the AC unit. Unplug the unit and keep it unplugged for about ten seconds before plugging it back in and starting the AC. If the error code persists, you need to seek repair service.

d) P2 or FL code displays, and the unit does not shut off. 

If the error code displays and the unit does not shut off, it is essential to contact an LG mechanic by requesting repair service.

3. LG AC CH 34

Reason: An AC unit may display a CH 34 error code for air conditioner due to abnormally high pressure in the sealed system. This does not indicate a defective appliance but rather an automated safety feature designed to protect the unit from overheating. 

Solution: To minimize the risk of this type of error code appearing, try taking the following precautionary steps:

a) Install an awning to shield the ODU from direct sunlight and harsh weather conditions.

b) Clean dirty condenser coils regularly to ensure proper airflow and prevent overheating.

c) When away from home, raise the cooling temperature instead of turning off your AC; this sets less strain on the appliance while providing adequate humidity control and cooling.

By following these simple steps, you can help prevent the CH 34 error code from appearing on your LG air conditioner and ensure your unit continues functioning correctly. If you encounter any issues, contacting a qualified technician for assistance is always a good idea.

4. E1 or CH02

Reason: When the E1 or CH02 error code appears on your LG air conditioner, it means there’s an Auto Stop Protection Error. This is usually caused by a short or open circuit in the indoor pipe sensor. This sensor detects the temperature of the refrigerant flowing through the unit and sends data to its control board. If faulty, improper readings are sent, resulting in a Protection Error.

Solution: Attempting to fix it without proper knowledge can be dangerous and worsen the situation even further. To solve this problem, LG AC owners should contact a certified technician for repair service. Also, scheduling regular maintenance visits can help prevent such issues from arising again.

5. E2 or CH01

Reason: LG ACs may occasionally experience the E2 or CH01 Auto Stop Protection Error. This error is triggered by a malfunction in the temperature sensor, which is responsible for providing readings of the room’s temperature to the AC control board. When accurate information isn’t received from this sensor, the unit shuts down automatically to prevent further damage.

Solution: If you come across this error, it is recommended that you contact LG service personnel to rectify the issue. They will closely examine your air conditioner and replace any defective parts where necessary.

6. E3 or CH03

Reason: The E3 or CH03 No Refrigerant Error is a common issue experienced by LG AC users. This error is triggered when the air conditioner cannot detect any refrigerant within the system. The purpose of the refrigerant within an AC unit is to cool down the air. If a leak in this component develops, it can damage your compressor and display the E3 or CH03 code.

Solution: Taking matters into your own hands and attempting DIY repairs may nullify certain warranties and cause additional damage – so it’s inadvisable. Therefore, you must contact LG service personnel if this error message appears on your AC unit. They will diagnose and fix the problem professionally and quickly, restoring cooling capability to your home.

7. E4

When the LG AC unit displays an E4 code, again it is not an error but an indication that the Defrost mode has been activated. This occurs when ice accumulates on the evaporator coil located behind the grille, inhibiting air flow. 

During this mode, the AC fan turns off and the cooling cycle pauses as refrigerant flowing is reversed to heat up the outdoor coil in order to melt any buildup of ice. Once all ice is melted, operations will resume as normal with the fan being restarted and cool air again streaming into your home or business. If a further buildup of ice is detected, then this process will repeat itself until no further ice appears and normal functioning can resume uninterrupted.

8. E5

The E5 Water Tank Full Error is a common issue reported by users of portable air conditioners. This error code indicates that the water collection tank at the bottom of the unit has become full and must be emptied manually. When a portable AC runs for an extended period, it collects moisture from the air through condensation and stores it in this water tank.

To fix this issue, you must power down then unplug your air conditioner from its power source. Locate and remove the water tank drain cap. Allow any water inside to be emptied into a container or safe-to-drain location until empty. Securely replace the drain cap before restoring power to your unit; only then will The E5 error message disappear from your control panel.

Long-term prevention of this occurrence can easily be done by considering local humidity levels, regularly emptying out its reservoir when necessary, and regularly cleaning filters within it.

9. HI or LO

Reason: When an AC unit displays HI or LO, it’s not a cause for alarm – these indications simply refer to the indoor temperature. When the temperature is 36°C or higher, it will show HI. Similarly, LO will be displayed when the temperature falls to 10°C or lower. This feature helps you adjust your AC’s settings in extreme weather conditions and keep the temperature comfortable.

Solution: To alter your AC’s settings when it shows HI or LO, simply adjust its set temperature. If it is too high, reduce it; if too low, increase it. This should resolve any temperature discrepancies and ensure that you experience optimal comfort inside your home.

10. SP/CP/PO Codes

LG AC units offer a range of function codes – SP, CP, and PO – visible on the display or remote when using the Power Cooling mode. 

Reasons: Regarding the SP/CP/PO codes appearing on your LG AC unit or remote, don’t worry; it just indicates that your appliance has entered into a more efficient cooling mode.

Solution: When utilising Power Cooling mode, colder air is discharged compared to the normal cooling setting. Models may have different names for this feature, such as Super Cool Power, Ice Cool Power and Turbo-Z. Note that you may only use this mode in Cooling Mode – not Dry or Air Purification Mode – as the system automatically sets temperatures and wind speed for optimum results.

11. ON

Reason: This system employs PM1.0 sensors that detect dust particles, while a diffuser also aids in removing smoke and other tiny debris. When the Air Purification mode is running, the LG AC unit displays an ON code on the screen to indicate the room’s dust levels and air freshness. 

The LG AC unit also has a colour indicator showing various air purification ranks based on the size/amount of existing dust particles. Blue corresponds to ideal air quality, Green for satisfactory levels, and Yellow and Red for worse temperatures, with the latter prompting automatic activation of the diffuser to clean up any detected pollutants. 

Solution: Keeping the PM1.0 sensor free from dirt buildup is essential for accurately monitoring air freshness. It can help maintain good overall conditions—to do so, open its cover and lightly wipe with a wet earbud before cleaning off any left-over moisture with a dry one before closing it back up again.

12. CH05 or CH53: Communication Error

Reason: If your air conditioning unit displays error codes like LG AC error code CH05 or, this denotes a lack of communication between the system’s indoor and outdoor parts. A communication breakdown may be attributed to various causes, such as disconnection of the communication cable, short circuits, faulty circuits, T-phase line disconnection, incomplete auto addressing or insufficient distance between power and communication cables.

Solution: When encountering these error codes, it is best not to attempt to troubleshoot and repair them alone – instead, contact LG service personnel for assistance. Trained professionals are better equipped to detect the source of the issue and resolve communication errors in AC units.

13. CA or CH10 – Faulty Discharge Thermistor Error

Reason: When an air conditioning (AC) unit displays the CA or CH10 fault code, it indicates a potential problem with the discharge thermistor. This vital component measures the refrigerant temperature as it leaves the compressor and is designed to shut down when temperature settings reach 130°C or higher.

Solution: If your AC starts flashing this code, it’s important not to try and fix the issue yourself. Doing so can be dangerous and potentially make matters worse. Instead, calling a professional AC service personnel is the best action. They’ll be able to diagnose and replace the faulty discharge thermistor if necessary — ensuring your AC unit runs smoothly without further damage.

14. CH38 – Low Refrigerant Detection

Reason: The CH38 error code is a common problem encountered by air conditioner users. It’s caused by low refrigerant levels and flashes to let you know there’s an issue. The compressor can heat up without sufficient refrigerant levels and cause expensive repairs or replacements.

Solution: The solution depends on the root of the problem. If it appears after installation, check the refrigerant levels. If it displays after using the appliance for a while, unplug it, wait five minutes and try again. If that doesn’t work, professional assistance may be needed to correctly refill your AC’s refrigerant levels.

15. CO – Communication Error

Reason: When using an air conditioner, there could be times when it creates a CO error. This can be determined by a poor connection between the control board and the display unit.

This issue may arise from erratic wiring or components like the control board and display suffering damage. 

Solution: To identify which is faulty, professional AC technicians must thoroughly check up for both parts. After troubleshooting is complete and the root problem is located, corresponding repairs or replacements will be made to re-establish the lost communication.

16. CH12 – Indoor Pipe Temperature Sensor Error

Reason: If your LG AC unit displays a CH12 error code, it indicates that the indoor pipe temperature has exceeded the acceptable range. This error code is a protective measure designed to prevent damage to the unit.

Solution: To resolve this issue, it’s recommended that you seek assistance from a qualified AC technician. They have the expertise and equipment to diagnose and fix the problem effectively. In the meantime, you can take note of the error code and switch off the AC unit to prevent any further damage or complications.

It’s important to address error codes promptly to avoid any potential damage to your AC unit. Ignoring error codes can lead to more significant issues down the line, potentially resulting in costly repairs or even the need for a complete replacement of the unit.

17. CH32 – High discharge temperature

Reason: The CH32 error code on your air conditioning system may point to an issue with the unit’s discharge temperature, a problem that can reduce the performance and longevity of the AC. Therefore, it is important to identify the root cause of this warning and take corrective action.

As an essential part of heat exchange processes in an AC, a lack of refrigerant can hamper cooling efficiency and lead to overheating issues. Insufficient refrigerant may be one reason the discharge temperature is too high. Another possible explanation is malfunctioning components, such as a faulty compressor, fan motor or capacitor worn out due to extended use, bad maintenance or power outages.

Solution: High discharge temperature problems in air conditioners often require professional attention to be resolved. Attempts to fix or recharge the AC can lead to damages or safety hazards. A certified technician will inspect your AC and diagnose the source of the issue before carrying out repairs such as adding refrigerant, fixing leaks, cleaning or replacing filters, or replacing components. Regular maintenance and tune-ups are also recommended to prevent high discharge temperatures from occurring in the first place and ensure that your AC is running at its best.

18. CH44 – Sensor Error

Reason: CH44 is a common error code found in air conditioning systems. It generally indicates a sensor malfunction in the system’s outdoor unit, likely due to loose, damaged, or disconnected wiring. To diagnose and fix the problem, you need to identify why it occurred in the first place.

The sensor’s connection to the control board is often responsible for this issue; if the wiring is frayed, corroded, or broken due to wear and tear or weather exposure, it may not transmit accurate temperature readings. Additionally, wires that aren’t properly insulated may pick up interference from other sources and consequently cause your AC to stop working properly.

Solution: When experiencing the CH44 error code in your air conditioning unit, it is important to identify and address the underlying issue. This requires a professional AC service technician with the appropriate experience and tools. During their visit, they will inspect the sensor in the external unit and check for any damage or lost connections. Additionally, they will test that all connections and wires function properly using a multimeter or continuity tester. If you do not feel confident attempting these steps, contact an expert immediately to ensure the problem is fixed as soon as possible.

Note: If you notice error codes flashing on your AC unit, such as CH01 or CH02, don’t panic. As a user, you cannot do much about these error codes, but it is important to note them down as they appear on the display unit or LG window remote. This will help the AC mechanic quickly identify the problem and carry out appropriate repairs.

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Final Thoughts

In conclusion, accessing an all LG AC error codes list, including split and inverter systems, can be invaluable for troubleshooting and resolving issues. Whether it’s a simple reset or a more complex repair, knowing the meaning of error codes can save time and effort. Remember to note any error codes that flash on the display unit or remote and provide them to a qualified AC mechanic for accurate diagnosis and repairs. We’re here to help! If you have any further questions, don’t hesitate to contact us or comment below.


What should I do if I see an error code like CH01 or CH02 on my LG AC unit?

If you see an error code like CH01 or CH02 on your LG AC unit, it’s important to note it and contact a qualified AC technician for further diagnosis and repairs. As a user, you cannot do much about these error codes, but noting them down will help the technician quickly identify the problem and take appropriate action.

What do I do if my LG AC unit displays an error code I’m unfamiliar with?

Suppose your LG AC unit displays an error code you are unfamiliar with. In that case, you can refer to our post-Ultimate LG AC Error Code List for Split, Inverter, and All Codes, which provides comprehensive information about various error codes and their meanings. If you still have questions, don’t hesitate to get in touch with us or comment below for further assistance.

Can I reset my LG AC unit to clear an error code?

Resetting your LG AC unit may sometimes clear an error code. You can try turning off the power to the unit for a few minutes and then turning it back on. However, it’s important to note that resetting the team may not always resolve the issue, and it’s best to consult a qualified AC technician for proper diagnosis and repairs.

What should I do if my LG AC unit keeps displaying the same error code even after resetting it?

Suppose your LG AC unit continues to display the same error code even after resetting it. Restarting to reset the unit repeatedly may not resolve the underlying issue or cause further damage. In that case, avoiding other attempts to reset the unit and contacting a qualified AC technician for professional assistance is recommended. Our team is here to help, so feel free to contact us or leave a comment below for additional guidance.

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