How to Solve E3 Error in AC: Samsung Air Conditioner Troubleshooting Guide!

  • Samsung air conditioner error codes pop up for a reason: to show the working condition of the AC. So, expect most of these errors to point to a fault and only a few to indicate a routine operation.    

    Error codes like CL (Auto-Clean Indicator), CF (Filter-Cleaning reminder), and CF (Automatic Defrost) are not actual ‘error codes’ as they don’t indicate a fault. Others like EL (Overheated Heater), C2 (Indoor Pipe Sensor Fault), and E4 (Forced Defrost, however, are the opposite – showing a fault.

    But what do you do with an error code? The first thing is to find its meaning. You have to interpret the code, and once you do, the next thing is to determine its most probable cause.

    Lastly, troubleshoot it, and that’s where this Samsung AC error code guide comes in. You’ll learn how to troubleshoot the errors mentioned above and many others.

    Let’s jump into it!

    Samsung air conditioner error codes

    In a rush? Check below the 16 most common Samsung AC error codes, their most probable causes, and troubleshooting.

    A Quick Guide to Troubleshooting Common Samsung Air Conditioner Error Codes

     Error CodeMeaning Probable CauseTroubleshooting
    1.CL Auto-Clean indicator Odor-producing indoor unitRun the “Auto-Clean’ command to get rid of the odor
    2.CFFilter cleaning/reset reminder Dirty filter Clean/replace the dirty filter of your indoor unit
    3.DFAutomatic DefrostThe AC is defrosting Wait for the Auto Defrost to end
    4.E3Indoor fan motor malfunctionFaulty indoor fan or circuit boardReplace the indoor fan or circuit board, depending on what’s faulty
    5.E4Forced Defrost Low refrigerant, faulty pump, broken temp sensor, or pressure fluctuation Contact the nearest Samsung service center
    6.E5Open/short indoor heat exchanger sensorFaulty outdoor heat exchanger sensor Replace the indoor heat exchanger sensor
    7.E6Open/short outdoor heat exchanger sensor Faulty outdoor heat exchanger sensor Replace the heater temperature sensor
    8.E7Open/short heater temp sensorFaulty heater temperature sensorReplace the heater temperature sensor
    9.C2Indoor pipe sensor faultFaulty indoor pipe sensor Replace the indoor pipe sensor
    10.E101Failed communication (indoor unit)Faulty connections or power cables around the indoor unitCheck for any loose connections or power cables and fix them
    11.E102Failed communication (outdoor unit)Faulty connections or power cables around the outdoor unitCheck for any loose connections or power cables and fix them
    12.ELOverheated electrical heaterPower surge Replace the heater temperature sensor or PCB
    13.E201 Failed communication (between the indoor and outdoor units)Loose connections or bad PCB (printed Circuit Board)Check for loose connections outdoors and indoors and if there are none, replace the main PCB
    14.E1/21Room temperature sensor faultDefective room temperature sensor Contact the nearest Samsung service center
    15.E1/22Heat exchange temperature-sensor fault Malfunctioning heat exchanger temp sensor Contact the nearest Samsung service center
    16.E1/54Bad capacitor or fan motor Replace the capacitor or fan motor
    17.E1/63 Bad EEPROM Replace the EEPROM

    17 Most Common Samsung Air Conditioner Error Codes

    Below are 17 error codes you will likely find on a Samsung air conditioner that you can troubleshoot.

    1. Samsung Air Conditioner Error Code CL (Meaning – Auto-Clean Indicator)

    The error code CL pops up on a Samsung AC to indicate that the unit is ready for cleaning. That’s likely to happen when the air conditioner’s indoor unit produces some bad odor. 


    Since CL is not a fault code, it shouldn’t concern you. You can clear the error code by using the Auto-Cleaning function on the AC. 

    2. Samsung Air Conditioner Error Code CF (Meaning – Filter Cleaning or Filter Reset)

    It’s essential to clean the AC’s filter or replace it when it clogs. The error code CF will pop up to remind you of that.


    If it has been a while since replacing the ACs filter, do it as soon as you notice the error code. 

    Samsung e201 error code

    3. Samsung Air Conditioner Error Code DF (Meaning – Automatic Defrost)

    The error code DF, which signifies Automatic Defrost, is ordinarily a non-concerning error code. It shows that your air conditioner is entering a defrost phase, and you should wait for it to complete.


    Wait for the AC to self-defrost. It may take up to 10-15 minutes.

    4. Samsung AC Error Code E3 (Meaning – Indoor Fan Motor Malfunction)

    The error code E3 will pop up when there’s an issue with the indoor fan’s speed. Reasons for that include a faulty indoor fan or circuit board. In both cases, the fan cannot spin freely, so 


    You need to replace the fan motor or circuit board once you establish which is faulty. An HVAC professional can help you with that.

    5. Samsung Air Conditioner Error Code E4 (Meaning – Forced Defrost Mode)

    The error code E4 typically indicates that the air conditioner is entering the defrost mode. However, unlike the error code DF, where the defrost is automatic, the defrost cycle in error code E4 may be forced.

    Reasons for that include:

    • Low refrigerant

    • Faulty heat pump

    • Faulty temperature sensor 

    • Very low or very high temperature


    Call the nearest HVAC expert or Samsung service center. 

    6. Samsung Air Conditioner Error Code E5 (Meaning – Open/Short Indoor Heat Exchanger Sensor)

    The error code E5 is likely to appear on a Samsung air conditioner when there’s a problem with the indoor heat exchanger sensor. It’s either the heat exchanger sensor is open or short.


    The indoor heat exchanger sensor needs replacing if it’s faulty. Contact the nearest Samsung service center to inquire about the same. 

    7. Samsung Air Conditioner Error Code E6 (Meaning – Open/Short Outdoor Heat Exchanger Sensor)

    While error code E5 shows a faulty indoor heat exchanger sensor, error code E6 shows a defective outdoor heat exchanger sensor

    It’s either the sensor is short or open and thus faulty. 


    You need to replace the outdoor heat exchanger sensor if it’s faulty, but you can ask for help from the nearest authorized Samsung service center.

    Samsung ac error code e3

    8. Error Code E7 (Meaning – Open/Short Heater Temperature Sensor)

    The error code E7 shows up on a Samsung AC to indicate an open or short heat temperature sensor. Such a sensor is faulty and unable to measure the heat exchanger’s surface temperature.


    Since the error code suggests a faulty heater temperature sensor, you should replace it. You can procure the service of an Authorized Samsung service dealer

    9. Error Code C2 (Meaning – Indoor Pipe Sensor fault)

    The error code C2 pops up when the indoor pipe sensor fails. In such a case, the air conditioner cannot measure your room temperature correctly and regulate it. So, the room may overheat as a result.


    If the indoor pipe sensor is faulty, replace it. Call the nearest Samsung service center to inquire about the same. 

    10. Error Code E101 (Meaning – Failed Communication Indoors)

    If there’s an issue, such as a loose connection or power cable inside, the error code E101 will appear. It shows there’s a broken connection around your indoor unit. 


    Inspect the indoor unit’s power cables and connections to see if there’s anything loose. If there is, fix it or call a professional

    11. Error Code E102 (Meaning – Failed Communication Outdoors)

    While the error code E101 shows failed communication indoors, the error code E102 suggests faulty transmission outdoors. There may be a loose connection around your outdoor unit, which you should check.


    Check for any loose connection or power cable on your outdoor unit and fix it. If you cannot do it, call an expert. If the error code carries on, you may need to replace the ACs printed circuit board (PCB).

    12. Error Code EL (Meaning – Overheated Electrical Heater)

    During a power surge, a power spike can overheat the electrical heater. When it does so, the error code EL will appear. Thus, check the PCB and heater temperature sensor for faults


    Inspect the heater temperature sensor and PCB and replace the faulty one. 

    13. Samsung E201 Error Code (Meaning – Failed Communication Between Indoor and Outdoor Unit)

    If communication fails between the inside and outside unit, the error code E201 will pop up. Thus, observe both units for any loose connections or power cables. Sometimes, however, the printed circuit board may be faulty.


    Check for any loose connections outside and inside and fix them.  If the error code persists, replace the PCB

    What is E4 error in Samsung air conditioner

    14. Error Code E1/21 (Meaning – Room Temperature Sensor Fault)

    The error code E1/21 pops up when the room temperature sensor fails to detect the temperature change in your room. In that case, the AC cannot cool and heat properly, thus unreliable. 


    You’ll need to replace the room temperature sensor if it is faulty. But since the replacement is technical, call the nearest Samsung service call or dealer

    15. Error Code E1/22 (Meaning – Heat Exchanger Temp Sensor Fault)

    When the heat exchanger temperature sensor fails, the error code E1/22 appears on a Samsung air conditioner. In that case, the sensor cannot measure the surface temperature of the AC’s heat exchanger. That means your Ac will struggle to heat and cool your space. 


    Call the nearest Samsung service or dealer to check and replace the temperature sensor.

    16. Error Code E1/54 (Meaning – Bad Capacitor or Fan Motor)

    If the capacitor or fan motor fails, the error code E1/54 will pop up. It could be that the capacitor is burnt or the fan motor is broken. In either case, the air conditioner cannot blow cold air


    Test the capacitor’s leads’ continuity (with a multimeter) and inspect the motor for breaks or whether it’s running. If either is faulty, replace it or call Samsung.

    17. Error Code E1/63 (Meaning – Bad EEPROM)

    Samsung air conditioners have an electrically erasable read-only memory (EEPROM) storage chip that may become corrupted. Once it does, its storage information may be lost, prompting the error code EEPROM.


    Try resetting the air conditioner, but call the nearest Samsung service center if it doesn’t reset.

    People Also Ask

    1. What Is E4 Error in Samsung Air Conditioner?

    The E4 error code on the Samsung air conditioner shows your AC is entering a forced defrost mode. You’ll need an expert to determine the underlying fault and fix it. 

    2. What Is C2 Error in Samsung AC?

    The error code C2 on a Samsung Ac indicates a faulty indoor pipe sensor. To eliminate the fault code, you’ll need to replace such a pipe sensor. 

    3. Why Is My Samsung AC Blinking?

    Your Samsung AC is blinking because the air filter is filthy and needs cleaning, or there’s loose wiring, low refrigerant, or frozen coils. The last three parts require an expert inspection and fixing. 

    Is it possible to confirm that the main board is indeed the cause of the issue?

    Yes, it is possible to confirm whether the main board is the cause of the issue. To do so, you can perform a couple of checks. Firstly, you can examine the fuse located at F702 on the main board. If the fuse is damaged or blown, it could indicate a problem with the board. Additionally, you can measure the voltage on the board. Check the input voltage, which should be around 12VDC, and the output voltage, which should ideally be within the range of 4.5-5VDC at IC02. By checking these elements and comparing them to the expected values, you can gather evidence to determine if the main board is indeed the cause of the problem. If further assistance is required, I can also try to find a diagram showing the location of these components for you.

    Is there a later version of the main board available for use?

    After conducting a thorough search on various parts sites, it appears that the specific main board PD-TQ24A1R-02 you mentioned, which is available at Repair Clinic, may actually be a later version of the main board. However, it is essential to note that this board has also been discontinued and is listed as no longer available or out of stock on several parts websites.

    What is the significance of the solder blob on the fuse?

    The presence of a solder blob in the middle of a wire on a fuse is not considered normal, and it signifies a potential problem. Normally, fuses are designed to have a continuous flow of electricity through the wire, allowing it to remain intact until it reaches its rated current capacity. However, a solder blob in the middle of the wire indicates that there has been an unauthorized modification or repair made to the fuse.

    This solder blob could be a result of someone trying to bypass the fuse’s safety mechanism by adding additional conductive material. By doing so, the fuse may no longer be able to properly protect against excessive current flow, which can lead to various dangers such as overheating, short circuits, or even electrical fires.

    It is crucial to note that any alterations or tampering with a fuse can compromise its ability to function effectively. Without the proper functionality of a fuse, the electrical circuit it is intended to protect becomes vulnerable to potential damage or hazards. Therefore, it is recommended to replace the fuse with a new one that is undamaged and hasn’t been tampered with.

    If you come across a fuse with a solder blob or any other form of modification, it is advisable to seek the assistance of a qualified electrician or specialist to properly assess and address the issue. They will be able to provide the necessary expertise and guidance to ensure the safety and integrity of the electrical system.

    What steps have been taken to troubleshoot the issue?

    To troubleshoot the issue, the following steps have been taken:

    1. Checked that both units are receiving 220-volt power.
    2. Inspected the fuse on the main pc board in the indoor unit, finding it to be in good condition.
    3. Offered to utilize a multimeter to check the voltage from the main pc board to the display board, but clarification is needed on the specific points to measure and the expected voltage readings.

    Could the power outage caused by the electric storm have affected the air conditioner?

    It is unclear whether the power outage caused by the electric storm could have affected the air conditioner. The last time the air conditioner was used a few weeks ago, it worked fine. However, it should be noted that during the interim period, there was a 10-hour power outage caused by the electric storm several miles away. It is possible that this power outage could have had an impact on the air conditioner, but without further information or inspection, it is difficult to say for certain.

    Why is the air conditioner unresponsive to both the remote and the on/off button?

    The air conditioner is unresponsive to both the remote and the on/off button due to a potential electrical issue. The display board does not light up when attempting to turn it on, and no action is observed. It is worth noting that there was a recent power outage caused by an electric storm several miles away. Although we cannot confirm if the power outage directly affected the air conditioner, it is a possible factor to consider. To troubleshoot, the power supply of both the indoor and outdoor units should be checked to ensure they are receiving the correct voltage. Additionally, inspecting the fuse on the main PC board in the indoor unit is recommended to rule out any potential issues.

    What model numbers are associated with the Samsung Mini Split Air Conditioner?

    The model numbers associated with the Samsung Mini Split Air Conditioner are AS18A6RC for the inside unit and US18A6RC for the outside unit.

    Where can the user find more detailed information about the air conditioner?

    Are the electrical diagrams in the Samsung Technical Manual detailed and comprehensive?
    The electrical diagrams in the Samsung Technical Manual are detailed and comprehensive. They provide a visual representation of the electrical components and connections of the air conditioner, helping with troubleshooting and understanding the electrical system.

    Is there any specific information about the Samsung Digimax A6 model in the Samsung Technical Manual?
    Yes, the Samsung Technical Manual includes information specifically for the Digimax A6 model. It provides details and instructions relevant to this particular model of air conditioner.

    Where else can I find Samsung manuals for air conditioners?
    You can also find Samsung manuals for air conditioners at This is another source where you can access Samsung manuals, including the AD 18 19 24 26 B1 Technical Manual.

    Does the Samsung Technical Manual include electrical diagrams?
    Yes, the Samsung Technical Manual includes electrical diagrams. These diagrams can be found at the end of the manual and can be helpful for understanding the electrical components of the air conditioner and troubleshooting electrical issues.

    Where can I find the Samsung Technical Manual for the Digimax A6 model?
    You can find the Samsung Technical Manual for the Digimax A6 model at They have a download link for the manual.

    Are you experiencing issues with your Samsung air conditioner? Don’t worry, we’ve got you covered with this thorough guide to troubleshooting common Samsung AC error codes. Whether it’s a CL Auto-Clean indicator or an E1/63 error, we’ll help you identify the probable causes and provide troubleshooting steps to get your air conditioner back up and running smoothly.

    But wait, there’s more! If you’re looking for even more detailed information about your air conditioner, we’ve found some additional sources that can be of great help. Check out, where you can find a download link for the Samsung Technical Manual for the Digimax A6 model. This comprehensive manual covers a wide range of Samsung air conditioners, including yours, and even includes electrical diagrams at the end. These diagrams can be invaluable for understanding the electrical components and troubleshooting any related issues.

    Additionally, you can also visit for more Samsung manuals. One particularly useful manual is the AD 18 19 24 26 B1 Technical Manual. This manual is likely to provide in-depth technical information about Samsung air conditioners, giving you a deeper understanding of your specific model and its inner workings.

    So, whether you’re looking for quick troubleshooting tips for common error codes or seeking more detailed information about your air conditioner, we’ve got you covered. Keep this guide handy for quick reference, and don’t hesitate to explore the provided sources for a deeper dive into your Samsung air conditioner. Stay cool and comfortable!

    Concluding Thought

    Now you have the 17 most common Samsung air conditioner error codes. You can thus refer to the list when your Samsung AC displays an error code you don’t understand. But if you cannot troubleshoot it, call the nearest Samsung service center for help. 

    Also Read: