What Does CL Mean on Mini Split: A Comprehensive Guide

The “CL” error code on a mini split system stands for “Filter Cleaning Reminder.” This code is displayed when the system’s filter needs cleaning, and it will disappear on its own after some time. However, it’s essential to address this issue promptly to maintain the system’s efficiency and longevity.

Clearing the “CL” Error Code

To clear the “CL” error code, you can follow these steps:

1. Check the Filter

  1. Ensure that the filter is clean and free from debris. If it’s dirty, remove it and clean it thoroughly.
  2. To clean the filter, you can rinse it with water or vacuum it. Avoid using a brush or a dishwasher, as it may damage the filter.
  3. Inspect the filter for any signs of damage, such as tears or holes. If the filter is damaged, it should be replaced.
  4. Carefully reinstall the clean filter, ensuring it is properly aligned and secured in place.

2. Reset the System

  1. After cleaning the filter, you may need to reset the system to clear the “CL” error code.
  2. The reset process varies depending on the manufacturer and model of your mini split system, so it’s essential to consult the user manual.
  3. Generally, you can reset the system by pressing and holding a specific button or combination of buttons for a few seconds.
  4. Refer to the manufacturer’s instructions for the exact steps to reset your mini split system.

If the “CL” error code persists after cleaning the filter and resetting the system, it may indicate a more severe issue that requires professional assistance. In this case, it’s recommended to contact a licensed HVAC technician to diagnose and repair the problem.

Maintaining Your Mini Split System

what does cl mean on mini splitImage source: Flickr

To maintain your mini split system and avoid error codes, it’s crucial to perform regular maintenance tasks. Here are some key steps to follow:

1. Clean the Filters

  1. Clean the filters once a month to prevent dirt and lint buildup, which can reduce the system’s efficiency and increase energy consumption.
  2. Use a soft-bristle brush or a vacuum cleaner with a brush attachment to gently remove any accumulated dust and debris from the filters.
  3. Avoid using water or any cleaning solutions on the filters, as this can damage the filter media.
  4. Ensure the filters are completely dry before reinstalling them.

2. Schedule Professional Maintenance

  1. Have a professional HVAC technician service your mini split system every six months to ensure it’s in top operating condition.
  2. During a maintenance visit, the technician will clean the coils, check for refrigerant leaks, tighten valves, and perform other necessary tasks.
  3. They will also inspect the system’s electrical components, check the airflow, and make any necessary adjustments to optimize the system’s performance.
  4. Regular professional maintenance can help extend the lifespan of your mini split system and prevent costly breakdowns.

3. Monitor the System

  1. Keep a close eye on the system’s performance and address any issues promptly.
  2. If you notice any unusual sounds, strange smells, or fluctuations in temperature, it’s a sign that something may be wrong with the system.
  3. Contact a licensed HVAC technician as soon as possible to diagnose and repair the problem.
  4. Ignoring minor issues can lead to more significant problems and potentially expensive repairs down the line.

By following these maintenance tips, you can ensure your mini split system operates efficiently, avoid error codes like the “CL” code, and extend the lifespan of your investment.


The “CL” error code on a mini split system indicates that the filter needs cleaning. To clear this code, clean the filter and reset the system. Regular maintenance, including monthly filter cleaning and biannual professional servicing, is crucial to maintain the system’s efficiency and longevity. If the error code persists, it’s best to contact a licensed HVAC technician for professional assistance.


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  3. How to Clean a Mini Split Air Conditioner Filter