L.J. Kruse Co. – What Are the Most Common Causes of Air Conditioner Leaks

When your air conditioner starts leaking water, there could be many reasons for this. In any case, it is crucial to take action as soon as you see water leaking from your air conditioner to avoid further damage to your unit or home.

What Are the Common Causes of Your Aircon Leaking?

There are various reasons why your air conditioner might be leaking. Here are some of the most common causes:

  1. Condensation
    One of the most common reasons an air conditioner leaks is condensation. When the air conditioner is turned on, the evaporator coils start to cool the air. This causes the air to become more humid, which can cause condensation to form on the coils. If this condensation is not removed, it can eventually start to leak from the air conditioner.
  2. Leaking Ductwork
    Another common cause of an air conditioner leaking is leaking ductwork. Ductwork is the system of pipes and vents that deliver air from the air conditioner to the different rooms in your home. If there are cracks or holes in the ductwork, air can escape and cause the air conditioner to leak.
  3. Refrigerant Leaks
    Refrigerant is a vital part of an air conditioner and can leak for various reasons. If there is a leak in the system, it can cause the air conditioner to leak. Refrigerant leaks can be caused by multiple things, such as a loose connection or a crack in the refrigerant line.
  4. Drainage Problems
    Another common cause of an air conditioner leaking is drainage problems. The air conditioner has a drain line that removes the water condenses on the coils. If this drain line becomes clogged, it can cause the water to back up and leak out of the air conditioner.
  5. Faulty Installation
    If the air conditioner is not installed correctly, it can cause the unit to leak. This is usually due to a problem with the seals around the unit. If the seals are not installed correctly, air can escape and cause the air conditioner to leak.

Why Do You Need to Find the Cause of Your Aircon Leak?

If you notice a leak in your air conditioner, you should first turn off the air conditioner. This will help prevent further damage to the unit. Next, you’ll need to find the source of the leak. If you see water coming from the condensate line, you’ll need to clear the line. If the leak comes from the evaporator coils, you’ll need to thaw the coils.

If you don’t find the source of the leak immediately, it could cause more significant problems later on. You may end up having to spend more money on repairs. If you can’t find the cause of the leak, call a professional as soon as possible, and do not use your air conditioner until they can repair it.


There are many potential causes of an air conditioner leaking water. The most common cause is a problem with the drainage system, which can be caused by a clog or condensation buildup. Sometimes, a leaking air conditioner can be caused by a refrigerant leak. If you think your air conditioner is leaking, it’s essential to have it checked out by a professional to determine the cause and to get the necessary repairs.

If you are looking for HVAC companies in Berkeley, you can contact us at L.J. Kruse Co. We serve both commercial and residential clients, for all of your HVAC needs. Book our services today!

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