Aircon evaporator coil not working? How to fix?

A malfunctioning best aircon evaporator coil can disrupt the cooling efficiency of your air conditioning system, leading to discomfort and increased energy consumption. Understanding the root causes behind this issue and knowing how to rectify it can restore your AC’s functionality. Let’s explore the reasons why an aircon evaporator coil might fail and outline a detailed Step by step procedure to fix the evaporator coil to address the problem effectively.


Why Isn’t the Aircon Evaporator Coil Working?

The aircon evaporator coil plays a crucial role in the cooling process by absorbing heat from indoor air. Several factors can contribute to its malfunction, including:


  1. Dirt and Debris Buildup: Over time, dust, dirt, and other airborne particles can accumulate on the evaporator coil, hindering its ability to absorb heat efficiently.
  2. Refrigerant Issues: Low refrigerant levels or refrigerant leaks can cause the evaporator coil to freeze up, impairing its function.
  3. Poor Airflow: Restricted airflow due to clogged air filters or blocked vents can lead to inadequate heat transfer across the evaporator coil, resulting in reduced cooling capacity.
  4. Corrosion or Damage: Corrosion or physical damage to the evaporator coil can impair its ability to conduct heat effectively, compromising overall system performance.


Step-by-Step Procedure to Fix the Evaporator Coil:

  1. Power Off the AC: Begin by switching off the power supply to the air conditioning system to ensure safety during maintenance.
  2. Locate the Evaporator Coil: Typically found inside the air handler unit or furnace, the evaporator coil is situated near the air intake.
  3. Inspect for Dirt and Debris: Carefully examine the evaporator coil for any signs of dirt, debris, or mold accumulation. Use a flashlight to illuminate hard-to-reach areas.
  4. Clean the Coil: Using a soft-bristled brush or a vacuum cleaner with a brush attachment, gently remove any dirt or debris from the coil’s surface. Be cautious not to bend the delicate fins of the coil.
  5. Check Refrigerant Levels: If the coil appears clean, check the refrigerant levels using a pressure gauge to ensure they are within the manufacturer’s recommended range. If levels are low, it may indicate a leak that requires professional repair.
  6. Inspect Air Filters and Vents: Examine the air filters for dirt or clogs, and replace them if necessary. Ensure that all vents are unobstructed to promote proper airflow.
  7. Address Refrigerant Leaks: If a refrigerant leak is suspected, contact a qualified HVAC technician to locate and repair the leak before recharging the system with refrigerant.
  8. Test the System: After completing the cleaning and maintenance tasks, turn the power back on and test the air conditioning system to verify proper operation and cooling performance.


Causes of Evaporator Coil Malfunctions:

  1. Dirt and Debris Buildup: Accumulation of dust and debris on the coil’s surface impedes heat transfer and reduces cooling efficiency.
  2. Refrigerant Issues: Low refrigerant levels or leaks can lead to inadequate cooling and potential coil freeze-up.
  3. Airflow Restrictions: Blocked air filters or vents restrict airflow over the coil, diminishing its ability to absorb heat effectively.
  4. Corrosion or Damage Corrosion or physical damage to the coil diminish its heat exchange capacity, affecting overall system performance.


By following these step-by-step instructions and understanding the underlying causes of aircon evaporator coil issues, you can effectively diagnose and address the problem, restoring your air conditioning system’s efficiency and comfort levels.

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