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How To Fix The Error Code CH42 For LG Air Conditioner How To Fix The Error Code CH42 For LG Air Conditioner


How To Fix The Error Code CH42 For LG Air Conditioner

Written by: Ethan Hayes

Learn how to fix the error code CH42 for LG air conditioners with our informative articles. Find step-by-step solutions and troubleshooting tips to resolve this issue.

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Is your LG air conditioner displaying the dreaded CH42 error code? Don’t panic! This fault code is related to the outdoor subcooling sensor and can be easily resolved. As an expert in this field, I’m here to guide you through the process of troubleshooting and fixing this error. Our goal is to provide you with the knowledge and skills necessary to get your air conditioner up and running smoothly once again. So, let’s dive in and learn how to tackle the CH42 error code.

Key Takeaways:

  • Don’t let the CH42 error code intimidate you! By following simple steps like cleaning the sensor and resetting the unit, you can troubleshoot and resolve the issue without the need for professional assistance.
  • Remember to prioritize safety when addressing the CH42 error code. If DIY troubleshooting doesn’t work, don’t hesitate to seek help from a professional technician to ensure your air conditioner runs smoothly.

What is the CH42 Error Code?

The CH42 error code on LG air conditioners indicates a fault with the outdoor subcooling sensor. This sensor is responsible for measuring the temperature of the refrigerant as it leaves the outdoor unit. When the sensor malfunctions or becomes inaccurate, it triggers the CH42 error code as a warning to the user.

How to Fix the CH42 Error Code:

Now that we understand what the CH42 error code signifies, let’s explore the steps to troubleshoot and resolve this issue:

  1. Turn off the air conditioner: Start by switching off the air conditioner and disconnecting it from the power source. This ensures your safety while working on the unit.
  2. Locate the outdoor subcooling sensor: The next step is to locate the outdoor subcooling sensor. It is usually positioned near the outdoor unit, and you may need to refer to your unit’s manual for specific guidance.
  3. Check the sensor for damage: Inspect the sensor for any visible signs of damage, such as frayed wires or corrosion. If you notice any issues, the sensor may need to be replaced. Contact a professional technician for assistance.
  4. Clean the sensor: Carefully clean the sensor using a soft cloth or brush. Dirt or debris accumulation can interfere with its accuracy, leading to the CH42 error code. Gently remove any obstructions, ensuring the sensor is clean and free from blockages.
  5. Reset the air conditioner: After cleaning the sensor, reinsert it into its original position and securely fasten any connectors. Then, plug in the air conditioner and turn it back on. The CH42 error code should no longer be displayed. If the error persists, further troubleshooting may be necessary.
  6. Seek professional assistance: If none of the above steps resolve the CH42 error code, it is recommended to contact a professional technician. They have the expertise and specialized tools to diagnose and repair complex issues.

Check the outdoor unit for any obstructions or debris that may be blocking the air flow. Clean the unit and ensure there are no obstacles around it. If the issue persists, contact a professional technician for further assistance.


Encountering the CH42 error code on your LG air conditioner can be frustrating, but with the steps outlined above, you can effectively troubleshoot and resolve the issue. Remember to follow all safety precautions and seek professional help if needed. By addressing the fault with the outdoor subcooling sensor, you’ll be able to enjoy the cool comfort of your air conditioner once again. If you found this guide helpful, feel free to share it with fellow LG air conditioner owners who may be facing the same issue. Happy cooling!

Frequently Asked Questions about How To Fix The Error Code CH42 For LG Air Conditioner

What does the error code CH42 indicate on an LG air conditioner?

The error code CH42 on an LG air conditioner typically indicates a refrigerant pressure sensor fault or abnormality. This error can prevent the air conditioner from functioning properly and may require some troubleshooting steps to resolve.
How can I reset the CH42 error code on my LG air conditioner?

To reset the CH42 error code on your LG air conditioner, start by turning off the unit and disconnecting it from the power source. Leave it unplugged for at least 10 minutes to allow any residual power to dissipate. Afterward, plug it back in and switch it on. This process should reset the error code, but if the issue persists, further action may be needed.
Can I fix the CH42 error code on my LG air conditioner myself?

While some simple troubleshooting steps can potentially resolve the CH42 error code on your LG air conditioner, it is generally recommended to have a professional technician inspect and repair the unit. They have the necessary expertise and tools to accurately diagnose and resolve the underlying issue.
What are some common causes of the CH42 error code on LG air conditioners?

Several factors can contribute to the CH42 error code on LG air conditioners. These may include refrigerant leaks, blockages in the refrigerant lines, faulty pressure sensors, or issues with the control board. Identifying the specific cause may require professional assistance.
Is it necessary to call LG customer service for the CH42 error code?

Depending on the severity of the CH42 error code on your LG air conditioner, it may be helpful to contact LG customer service for guidance. They can provide you with specific troubleshooting steps, advise if any warranty coverage is applicable, or recommend a certified repair technician if needed.

Solved the CH42 error on your LG air conditioner and craving more handy fixes for common home appliances issues? Check out our latest piece on fridge troubles. Dealing with puddles inside your refrigerator can be frustrating, yet often, a simple refrigerant leak is to blame. With expert advice, you'll learn how to identify and remedy leaks swiftly, ensuring your fridge runs smoothly again.

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