How to Clean DELLA AC Indoor Unit: A Comprehensive Guide

Maintaining the cleanliness of your DELLA air conditioner (AC) indoor unit is crucial for its efficient operation and longevity. This comprehensive guide will walk you through the step-by-step process of cleaning your DELLA AC indoor unit, covering both basic and advanced techniques to ensure your unit runs at its best.

Preparing for the Cleaning Process

Before you begin, ensure that the AC unit is turned off to avoid any accidents or electrical hazards. Locate the tabs on the side of the indoor unit and gently lift them up to access the filters. Carefully slide out the filters, taking note of their orientation for proper reinstallation.

Cleaning the Filters

how to clean DELLA ac indoor unit

  1. Vacuum Cleaning: Use a vacuum cleaner with a soft brush attachment to gently remove dust and debris from both sides of the filters. Be careful not to damage the filter material.
  2. Washing: If the filters are heavily soiled, you can wash them with a mild detergent and warm water. Rinse the filters thoroughly and allow them to air dry completely before reinstalling.
  3. Replacement: If the filters are damaged or beyond cleaning, it’s recommended to replace them with new ones to ensure optimal air quality and system performance.

Disassembling the Indoor Unit

  1. Cover Removal: Locate the screws or clips that secure the cover of the indoor unit and carefully remove the cover to access the internal components.
  2. Coil Inspection: Examine the coils for any visible dirt, dust, or debris buildup. If the coils appear heavily soiled, proceed to the coil cleaning step.
  3. Blower Wheel Inspection: Inspect the blower wheel for any accumulated dust or debris. If necessary, clean the blower wheel using a soft brush or compressed air.

Cleaning the Coils

  1. Coil Cleaner Application: Spray a no-rinse evaporator coil cleaner directly onto the coils, ensuring even coverage. Allow the cleaner to sit for at least 20 minutes to effectively break down and dissolve any built-up grime.
  2. Rinsing: Using a garden hose or a low-pressure water spray, rinse the coils thoroughly to remove the dissolved dirt and debris. Be careful not to bend or damage the delicate coil fins.
  3. Fin Straightening: If the coil fins are bent, use a fin comb kit to gently straighten them, ensuring optimal airflow and heat transfer.

Cleaning the Blower Wheel

  1. Brush Cleaning: Use a soft-bristled brush to gently remove any dust or debris from the blower wheel. Avoid using excessive force to prevent damage to the wheel.
  2. Compressed Air: Alternatively, you can use compressed air to blow out any remaining dust or debris from the blower wheel.

Reassembling the Indoor Unit

  1. Reinstalling the Filters: Slide the cleaned or new filters back into the indoor unit, ensuring they are properly aligned and secured in place.
  2. Replacing the Cover: Carefully replace the cover of the indoor unit, aligning it correctly and securing it with the screws or clips.
  3. Restoring Power: Turn the power back on to the AC unit and ensure it is functioning properly.

Advanced Cleaning Tips

  1. Drain Line Cleaning: Check the drain line for any blockages or debris buildup and clean it if necessary to prevent water leaks or overflow.
  2. Coil Cleaning Spray: Consider using a specialized coil cleaning spray for a more thorough and effective cleaning of the coils.
  3. Professional Maintenance: If you are unsure about any step in the cleaning process or encounter any issues, it’s recommended to consult a professional HVAC technician for assistance.

Safety Precautions

  • Always turn off the power to the AC unit before starting the cleaning process.
  • Use caution when handling sharp objects, such as fin combs and screwdrivers, to avoid injury.
  • Wear appropriate personal protective equipment, such as gloves and eye protection, during the cleaning process.
  • If you have any concerns or doubts about the cleaning process, refer to the DELLA AC indoor unit’s user manual or contact a professional HVAC technician.

By following this comprehensive guide, you can effectively clean your DELLA AC indoor unit and ensure its optimal performance and longevity. Remember to prioritize safety and consult the manufacturer’s instructions if you encounter any issues during the cleaning process.


  1. How to clean DUCTLESS MINI SPLIT air conditioner (Mitsubishi) – YouTube
  2. DIY Cleaning Mini-Split Filters – YouTube
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