Nothing is more frustrating than having error codes in your air conditioner and not knowing what they mean. This article is about LG air conditioner error codes, what they mean, and how to fix them.
Table of Contents
LG Air Conditioner Error Codes – What They Mean
F1, F2, or F3 – This is not an error code but may represent the fan speed. Check the unit’s mode of the air conditioner to see if it is in Fan mode. If it is, then it is the fan speed.
FL – The code may be an alert that the water collection tank needs to be emptied. Check the tank and empty it if it is full.
CH01: The air thermistor in the indoor air conditioning unit may have an open circuit. Disconnect the air conditioner from electric power and contact LG for assistance.
1 – The error code may be an indication of a temperature sensor failure. Disconnect the air conditioner from electric power and check to see if the wire harness is correctly connected to the control board. Also, ensure the control board is not damaged in any way. If the thermistor or sensor is not is faulty, replace it.
E2, E3 – An indoor temperature sensor failure may have failed. Check the sensor in much the same way as you would check the sensor in error code 1. And if there is a problem, replace the sensor.
E3 – The error code can also mean that the air filters are too dirty or the fan blades are broken. It will result in an abnormal protection error. So, remove electric power from the air conditioner and check the wire connections to be sure they are correctly connected. Replace damaged fan blades, motor, dirty filters, and wire harnesses.
E4 – This error code is applicable only to portable LG air conditioners and it indicates the unit is defrosting. The code should disappear after the defrost cycle and the unit should begin cooling again. It is crucial to check it to ensure it is working. If it is, the code is normal but if not, you may want to replace the air filter.
P2 – This is also a code for a portable air conditioner and represents a full water collection tank. The code should disappear when the tank is empty but if you still see P2 or FL, you may have to change the float switch or the tank’s sensor.
2 – The sensor for the inlet pipe in the indoor unit may have an error.
5 – There may be a communication error between the outdoor condenser unit and the indoor unit.
6 – The sensor for the outlet pipe in the indoor unit may have developed a fault.
9 – This error code may indicate an EPROM error in the indoor unit.
10 – The BLDC motor fan may be locked inside the indoor unit.
12 – The middle pipe’s sensor in the indoor unit may have an error.
21 – The code may indicate a DC Peak fault, which means the direct current (DC) voltage to the compressor was too high.
22 – It may be a current transformed error, indicating a high input of alternating current (AC).
23 – Direct current link has low voltage
25 – The alternating current (AC) either is too low or too high.
26 – The code may represent an error in the DC Comp. position. There is no rotation, meaning it is locking.
27 – The current that goes to the inverter compressor between the DC and AC converter circuit is too high.
28 – The DC voltage to the inverter compressor is too high.
29 – The amperage of the inverter compressor is too high.
31 – The thermistor of the current-to-current transformer is too high.
32 – The D-pipe or the discharge pipe to the inverter compressor is overheating.
40 – The thermistor or sensor is shorted or disconnected.
41 – There is a disconnection or short in the discharge pipe sensor INV. Consider checking it.
44 – The outdoor air thermistor is shorted or disconnected. You may want to check it.
45 – Check the middle sensor or thermistor in the outdoor condensing unit. It may be shorted or disconnected.
46 – The thermistor or sensor on the suction line of the outdoor unit may be shorted or disconnected.
48 – The thermistor of the condensing unit outlet or liquid line may be shorted or disconnected.
53 – The code may be an error indication of a failure in communication to the indoor unit from the outdoor unit.
60 – It may be an EPROM error with the outdoor unit’s circuit board.
61 – The code is alerting you to the high temperature of the outdoor condensing coil unit.
62 – The PCB heat sink of the inverter compressor in the outdoor condensing unit has a high temperature.
63 – The thermistor of the condenser coil pipe has a very low temperature.
65 – There is a disconnection or short in the heat sink thermistor.
67 – The outdoor brushless direct current fan motor may have a lock error.
There are so many other error codes you will find with an LG air conditioner. But bear in mind that there are many models and types and these errors spread to all of them. The best fix for an error code is to check the user manual to determine whether or not you can fix it. If you can, it is crucial to do so immediately. Otherwise, let a professional check and fix it as quickly as possible.
LG Air Conditioner Error Code CH 05 – Meaning and Solution
When you see this error code, it indicates that the indoor and outdoor units have an error in communication. You may notice that the outside unit has 53 displayed on it when the indoor unit is showing 05. These codes appear when there is incorrect wiring
Check the power supply to the indoor and outdoor units to ensure the supply is up to the required voltage. If not, correct the voltage supply as necessary. It should be 230 volts, plus or minus 10%. While doing so, check the wiring and correct any mistakes as needed.
If that does not work, you can further test with a multimeter. Set the multimeter to DC volts and check between terminals two or Earth and five on the outside condensing unit. Place the black meter probe on terminal two and the red probe on terminal five. The Vdc should be a fluctuating 0-72.
If you do not see this voltage, pull out the cable at terminal five and run a voltage test between terminal two and terminal five, using the black probe for two and the red one for five. The voltage should be steady at this point and should be between -0.1 and -10.0. If it is not within this range, the indoor PCB may be defective or the terminal five cable is faulty.
Disconnect the communication wire in the indoor unit and check the voltage output on its terminal. If there is no voltage, replace the PCB but if there is voltage, replace the terminal five cable.
LG Air Conditioner Error Code CH 38 – Meaning and Solution
The error code appears when the air conditioner’s refrigerant level is low. It is one way to alert you and protect the unit from damage. Sometimes, it will appear after you have been using the unit for a while. Other times, it will appear after installation or reinstallation.
If it appears after you have been using it for some time, it may be a minor electrical fault from power fluctuations. Disconnect the unit from electric power and power off the circuit breaker. Wait about five minutes and power on the circuit breaker. Restore power to the unit and check to see if the code reappears. If it does, you need to get professional help. The same applies if the source of the code is low refrigerant.
LG Air Conditioner Error Code CH 23 – Meaning and Solution
The error code represents a problem in the inverter circuit’s DC part. The DC voltage flowing to the inverter is less than the minimum 140 DC voltage. Typically, the voltage should be 600 for three-phase units and 370 for single-phase units.
The problem may stem from the inverter charging resistor. If it is defective, it will cause the DC voltage to drop and the error code appears. While the air conditioner is running, check the supply of DC voltage to the inverter. If your unit is a single-phase type and the voltage is less than 370 volts, replace the resistor. The same solution applies if your unit is a three-phase type and the voltage is less than 600 volts.
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LG Air Conditioner Error Code CH 10 – Meaning and Solution
The motor of the fan in the indoor unit is not running. When this happens, the unit displays this error code. The problem may stem from an electrical failure or a mechanical fault. Check the motor to ensure nothing is snagged in it, preventing it from running. Also, ensure the bearings are not worn and the motor is sound electrically with no open circuit.
Furthermore, check the PCB that supplies electric power to the motor to be sure it is supplying the required amount of voltage. And the rotation feedback circuit must be in good working condition. A multimeter will help you determine whether or not there is an open circuit or a lack of power supply.
LG Air Conditioner Error Code CH 22 – Meaning and Solution
The inverter compressor has a high current and may get damaged. The error code appears to alert you of this problem. Therefore, it is crucial to find a quick solution, ideally from a trained professional. Since it involves live voltage and the compressor, it is best to leave the repair to a qualified HVAC technician.
LG Air Conditioner Error Code 09 – Meaning and Solution
When you see this error code, you may want to check the PCB assembly. When the wrong type of PCB assembly is installed, the error code appears and the air conditioning unit will not. While checking the PCB, take a look at the EEPROM to ensure it is fully fixed into the socket. Also, check to see if there are dry joints. These are problems that trigger the error code. Replace the PCB if there is none or the wrong type was installed.
LG Air Conditioner Beeping Error – What to Do
If the air conditioner is a window unit, the beeping may be an alert that the air filter is due for a replacement. Dirty air filters cannot work optimally and it reduces the quality of air in your home as well as puts the unit’s components at risk. Check and replace the filter if necessary. Also, replace it every three months for the best results.
The beeping sound may also mean the remote needs new batteries. It is a way to tell you to remove the old batteries so that they do not leak fluid and damage the remote. If the batteries have been in use for longer than one year, it is time to replace them.
When the power goes out, a sensor within the unit may begin beeping as an alert. Check the breaker and turn it on if it is tripped. If not, reset the breaker by turning it off and on. But if the breaker is not the problem, then an internal sensor may be defective. The beeping may also mean the condensation in your unit is excessive. Contact an HVAC service agent to check and service the air conditioner if necessary.
LG Air Conditioner Error Code CH 52 – Meaning and Solution
Error code Ch 52 indicates that there is an error in communication between the main PCB of the outdoor unit and the inverter PCB. Before replacing any part, you may want to check the fuses. A blown fuse can cause the PCB to malfunction and it is easier to replace. If all the fuses and LEDs are in good working condition, then you may have to test both PCBs and replace the faulty ones. Consider using the services of a service technician to do the job.
LG Air Conditioner Error Code E5 – Meaning and Solution
The error code means that the water collection tank in your air conditioner is full and needs emptying. Remove the drain cap at the bottom of the tank and leave it off until all the water in the tank drains. Put the cap back in place and check the air conditioner. The error code should disappear.
LG Air Conditioner Error Code E3 – Meaning and Solution
The air conditioner has little or no refrigerant when you see the error code. The same applies if the unit displays error code Ch 03. The best solution is to hire a qualified technician to check the cooling lines and find the leaks. Then, they can recharge the system with refrigerant.
Typically, refrigerant is recycled. Because it usually runs in a closed system, there is never a need to add more as long as the appliance is working unless there is a leak. And while the refrigerant is not hazardous to health in small amounts, it can adversely affect you if inhaled in a large quantity.
LG Air Conditioner FL Error Code – Meaning and Solution
When you see the FL error code, it means the drain pan is full. The same applies if the error code is P2. Typically, the pan should not have enough water to affect the functionality of the unit. There is a slinger fan that slings the water in the pan to the condenser coil to help dissipate and lower heat.
Tilt the air conditioner a little towards the back after removing the cap over the drain port. That way, the standing water can drain. If it remains, the drain line may be blocked and you need to clear it.
When the air is humid and the unit is in Cool mode, the drain pan will fill up quickly due to the moisture in the air and the error code will keep reappearing. It does not mean something is wrong. Instead, it means the air conditioner is operating well. But you can lower the fan speed to reduce the frequency at which the pan fills. Also, ensure you close every door and window for a more controlled environment.
However, you may have to reset the air conditioner if the error code remains when the drain pan is empty. Disconnect the unit from electric power, leave it for about ten seconds, and reconnect it to electric power. Turn on the air conditioner by pressing the power button. Wait to see if the code appears again. If it does, contact LG and request immediate service.
LG Air Conditioner Error – Lights Flashing
The refrigerant in the air conditioning unit may be too low and is affecting the functionality of the unit. Also, loose wires can cause the unit to flash. Check for loose connections in the unit as well as the refrigerant level. These problems will require professional assistance to fix. Therefore, contact LG for support, especially if you have an active warranty. Otherwise, hire a qualified independent technician for assistance.
LG Air Conditioner HL Error – Meaning and Solution
An HL error code on your LG split air conditioning unit means the float switch has an open circuit. In other words, it is no longer working. The best solution is to replace the switch to prevent an overflow of the drain pan, especially when the drain line is obstructed. This can cause the air conditioner to stop cooling.
LG Air Conditioner Error Code 21 – Meaning and Solution
The DC power circuit of the inverter has too much current, causing the error code to appear. If the current is more than 14 amps, you will see the code. The compressor may be ground to earth or have an open circuit. The inverter PCB may also be faulty, leading to the current problem.
Go to the unit’s compressor and disconnect the electrical connections. Next, check the resistance of the windings of the compressor using a multimeter. Go from U to V and V to W, then W back to U; you should get values that range between 0.25 ohms and 5 ohms at each point.
Now, check the resistance of the windings of the compressor to Earth. With a high voltage meter, check the resistance of any compressor terminal to an Eath point, which is a pipe; the compressor usually has three terminals. You should get more than 2 M ohms. If these results are not what you get, you will need a technician to look at the compressor and find a solution.
LG Air Conditioner Error Code CH 35 – Meaning and Solution
The error code may indicate that there is excessive low pressure, either because the pressure sensor is faulty or there is not enough refrigerant in the system. You may have to check and replace the sensor if it is no longer working. Otherwise, check for leaks in the closed system and repair them before adding more refrigerant.
What Does E4 Mean on an LG Air Conditioner?
E4 means the air conditioner is defrosting. It is not an error code but is indicating that the unit is automatically melting ice it may have detected on the evaporator coil. It will go back to normal operations when the ice melts off the coil and the defrost function turns off.
LG Air Conditioner Error Code CH 01 – Meaning and Solution
The error code means the return air thermistor in the indoor unit is faulty. Disconnect the thermistor from the unit’s PCB and run a test on its resistance using a multimeter. You can also opt to check the thermistor’s DC voltage while it is still connected to the PCB. if you are unsure how to check the sensor, get a technician for the job.
LG Air Conditioner CH 07 Error – Meaning and Solution
You will find this error code on multi-split units. The primary unit is the heat/cool master and it dictates the functions of the condensing unit. If the condenser is set to heat mode and other units are set to cool mode, the error code will appear. And if the condenser is in cool mode and others are in heat mode, the code appears. Use the remote to turn the unit off and back on. Change the unit’s temperature mode and the error code should disappear.
LG Air Conditioner Error Code CH 04 – Meaning and Solution
When you see this error code in your LG air conditioner, it means the fan coil’s float switch has risen. You will need to pump away excess water for the float to fall. If the fan coil has no drain pump, the error means the terminal CN float jumper is not there.
Typically, the code appears on the remote after about three minutes of the fault. It will take about 40 seconds for the error code to disappear after the float falls or you fix the jumper on the control board. You may want to reset the unit to clear the code.
LG Air Conditioner Error Code CH 02 – Meaning and Solution
The coil inlet thermistor of the indoor unit is defective and the error code is alerting you to the problem. Disconnect the thermistor from the PCB of the indoor unit and run a resistance check on it using a multimeter. Alternatively, run a DC voltage test on the thermistor while it is still connected to the PCB. Consider using the services of a qualified HVAC technician to check the sensor because it may involve live voltage.
LG Air Conditioner Error Code CH 06 – Meaning and Solution
The coil outlet thermistor of the indoor unit is defective and the error code is an alert. Disconnect the thermistor from the PCB of the indoor unit and run a resistance test on it using a multimeter. You can also opt to run a DC voltage test on the sensor while it is connected to the control board. Contact LG or hire an independent technician to find and fix the thermistor fault.
LG Air Conditioner Error Code CH 12 – Meaning and Solution
The sensor on the indoor unit’s middle pipe is faulty. The best solution is to replace it but you may not be able to do it without training. Only an HVAC technician can check and fix the problem.
LG Air Conditioner Error Code CH 150 – Meaning and Solution
This code may represent an insufficient voltage supply to the outdoor condensing unit. Ensure the fuses are not blown and the breaker panel is working. Also, check the main PCB of the outdoor unit for signs of damage. If it is not working or nothing else seems to be causing the problem, replace the PCB.
LG Air Conditioner Error Code CH 26 – Meaning and Solution
The code may indicate a problem with the inverter circuit. Typically, it shuts the inverter compressor down when the current is too high. But if it fails to work, the compressor will seize. Check the connection of the compressor to ensure it is correct. If it is, turn the breaker for the unit off, wait about five minutes, and turn it on again. Doing this resets the air conditioner.
Now, wait for the compressor to resume operation. You may hear a high-pitched whine as the compressor tries to start and run. If it fails to start but keeps making a noise, you may have to replace the compressor. However, let a technician determine whether or not there are other solutions to the problem.
LG Air Conditioner Error CH 24 – Meaning and Solution
The error code indicates that the air conditioning unit has a high or low-pressure problem. There are two switches that control high pressure and low pressure. The high-pressure switch opens when the suction pressure drops below 41 bar while the low-pressure switch opens at 0.5 bar. However, you will see the error code only if the pressure trips off up to five times in less than an hour. Turn off the breaker that supplies power to the condenser outside the house for a couple of minutes to reset it.
If the LG air conditioning model does not have a pressure switch, you may see a plug marked CN Press on the PCB. the plug usually has a link plugged into it. If the link is not there, it will explain the error code. Replace the link to fix it; contact LG for the link as you may not find it as a replacement part.
LG Air Conditioner Error Code CH 29 – Meaning and Solution
The air conditioner’s compressor may be damaged. Check the flow of current to the compressor as it may be too high and has overloaded it. You will need the assistance of a qualified technician to determine if the fault is from the compressor or some other component and fix it.
LG Air Conditioner Error Code CH 32 – Meaning and Solution
When the discharge temperature of the inverter compressor is higher than it should be, over 105 degrees Celsius, the error code appears. The problem could stem from an obstruction in the system or low refrigerant.
Power down the air conditioner for about two minutes and power it up again. When the compressor begins to run again, check its discharge temperature; it should not be more than 50 degrees Celsius higher than the condensing unit’s surrounding temperature. Therefore, check the discharge temperature to ensure it is low enough and the air conditioner is releasing enough cold air.
LG Air Conditioner Error Code CH 33 – Meaning and Solution
The discharge temperature of the fixed speed compressor is higher than 105 degrees Celsius. That means there is an obstruction in the system or the refrigerant level is low.
Power down the air conditioner for about two minutes and power it up again. When the compressor begins to run again, check its discharge temperature; it should not be more than 50 degrees Celsius higher than the condensing unit’s surrounding temperature. Therefore, check the discharge temperature to ensure it is low enough and the air conditioner is releasing enough cold air.
LG Air Conditioner Error Code CH 48 – Meaning and Solution
Air and outdoor unit discharge sensors are not connected. You will need the services of a qualified technician to check and fix the faulty sensors, replace them if necessary.
LG Air Conditioner Error Code CH 41 – Meaning and Solution
The discharge thermistor of the inverter compressor is no longer working and the code is alerting you to the fault. Disconnect the thermistor and check its resistance using a multimeter. You can also choose to test the thermistor while it is still connected to the main PCB but you will check its DC voltage. Replace the thermistor if it is no longer working.
LG Air Conditioner Error Code CH 44 – Meaning and Solution
The error code indicates that the air thermistor of the outdoor unit is not working. Disconnect the thermistor and check its resistance using a multimeter. You can also choose to test the thermistor while it is still connected to the main PCB but you will check its DC voltage. Replace the thermistor if it is no longer working.
LG Air Conditioner Error Code CH 45 – Meaning and Solution
The error code indicates a problem with the outlet thermistor of the outdoor condensing unit. Disconnect the thermistor and check its resistance using a multimeter. You can also choose to test the thermistor while it is still connected to the main PCB but you will check its DC voltage. Replace the thermistor if it is no longer working.
LG Air Conditioner Error Code CH 43 – Meaning and Solution
The error code indicates a problem with the sensor of the high-pressure switch. Check the DC voltage running between the black and white cables on the plug or hire a professional technician to check it and offer further assistance.
LG Air Conditioner Error Code CH 42 – Meaning and Solution
The error code indicates a problem with the sensor of the low-pressure switch. Check the DC voltage running between the black and white cables on the plug or hire a professional technician to check it and offer further assistance.
LG Air Conditioner Error Code CH 46 – Meaning and Solution
The compressor suction thermistor may have a problem if you see this error code on your LG air conditioner. Disconnect the thermistor and check its resistance using a multimeter. You can also choose to test the thermistor while it is still connected to the main PCB but you will check its DC voltage. Replace the thermistor if it is no longer working.
LG Air Conditioner Error Code CH 54 – Meaning and Solution
You may find this error code on three-phase air conditioning units. There may be a lost phase or reversed phases on the power supply. Check the three phases to ensure they are available at the power terminals. The result you should get is 415 volts alternating current (AC) across terminals blue to yellow, red to blue, and red to yellow.
If the voltage output is correct, then disconnect electric power to the air conditioning unit and swap the yellow cores of the supply cable. Then, reset the AC and it should begin to run normally.
LG Air Conditioner Error Code CH 52 – Meaning and Solution
There may be a communication error between the main PCB of the outdoor condensing unit and the inverter PCB. Check the LEDs and fuses for faults. If they are in good working condition, the inverter PCB or outdoor PCB may be faulty.
LG Air Conditioner Error Code CH 50 – Meaning and Solution
The error code indicates that the outdoor condensing unit’s capacity is too small for the indoor unit or units. Contact the manufacturer to determine whether or not this could be an issue. Have the condensing unit and fan coil’s model numbers handy so that you easily verify the units you have and whether they go together.
LG Air Conditioner Error CH 67 – Meaning and Solution
The motor of the fan in the outdoor unit may have seized working or there is a failure in the rotation sensing circuit. Check to see if the motor has any debris snagged in it or if it has an electrical failure. Clean the blades and motor and run it again. If everything is working well, you may have to replace the outdoor unit’s PCB if the error code remains.
LG Air Conditioner Error CH 62 – Meaning and Solution
The sensor or thermistor for the outdoor condensing unit inverter heat sink is detecting that the heat sink’s temperature is too high, over 85 degrees Celsius.
LG Air Conditioner Error Code CH 61 – Meaning and Solution
The condenser coil is overheating, the temperature rising above 65 degrees Celsius if you see this error code. You will notice it mostly when the air conditioner is in cooling mode and it means there is not enough air blowing over the coil.
Debris over the coil can cause overheating. Ensure the coil is clean and there is no short circuit in the system. Use the services of a qualified technician to check the unit, clean it, and repair any damage.
Recap
There are many error codes you will find in LG air conditioners and some of them will require replacement parts. LG manufactures several types of air conditioning units and these error codes spread to all of them.
However, if you do not see an error code displaying on your remote or air conditioning unit, contact LG to report the issue and request service. You can also use any experienced HVAC technician to check the unit and offer further assistance.
