What Causes Aircon To Leak

Aircon leaks are one of the worst problems one can encounter. Waking up in the morning or in the middle of the night to find our aircon stopped and leaking water can be very frustrating and put one in a bad mood for the rest of the day. To avoid this hassle, knowing what causes the aircon to leak is essential. Knowing the causes will allow you to identify and solve the one at hand and help prevent them in the future.

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Causes Of A Leaking Aircon

Since Aircons are complex machines, leakage can arise anywhere inside them, and identifying the correct source of the leakage can be Ricky in many cases. The most common causes of a leaking aircon include;

1.   Clogged Drains Line

Drain lines connect the overflow plan’s interior to the aircon unit’s exterior. They allow water to flow from the overflow pan to the outside; thus, they are essential for the normal function of the aircon unit, and wherever a clog occurs in any of these pipes.

The water can cause backflow to collect in the overflow pan and can start leaking. The drain lines are clogged due to many reasons, but dirt and debris constitute the most common of these causes. Thus we strongly recommend cleaning the drain pipes every once in a while to prevent any buildup.

2.   Damage To The Overflow Pan

The overflow pan can get damaged and broken in several places and causes the aircon to leak inside. Overuse of the pan over several years and low maintenance jobs can cause it to break apart in several places, like the corners and edges.

These breaks can cause water leakage to the outside. This damage to the overflow pan constitutes one of the significant problems and causes the aircon to leak.

3.   Clogging Of The Airfilter

The air filter filters out the dirt and debris from the air and makes it clean and safe for breathing. If you don’t change the air filter after a short time, chances are that the filter will get clogged, and the airflow will be hampered. So how does this hampering of the airflow lead to water leaks?

The air coils in the aircon are full of cool air, which can condense into water vapors which can then form water droplets. If the clog in the air filter is present for a long time, these water droplets can develop in sufficient amounts to corrode the coils, leading to a leak. Thus clogging of airflow also causes aircon leakage.

What Causes Aircon To Leak

4.   Incorrect Installation

Human error is also one primary reason which causes aircon to leak since improper and unprofessional installation can present with leaks more often than you think. If any of the water-containing parts of the aircon are not correctly installed, the water might make its way through them, and they might leak.

These leaks can be challenging to deal with; in most cases, their solution only lies in changing the leaking parts.

Now that we have discussed some of the significant causes behind aircon leaks, let’s take a look at some of the methods to prevent them.

  1. Ensure that you clean all parts of the aircon regularly. This prevents any buildup of dirt and debris and can be crucial to prevent any clog development.
  2. Ensure proper outflow of water to the outside. A sound outflow system will prevent any water buildup, and thus the chances of leaks will be minimized.
  3. Change the air filter regularly. Changing the filter will not cause any air clogging, and all types of condensation will be prevented.
  4. Make sure you take the help of professionals in installing your aircon unit. Allowing professionals to do the job will prevent any mishaps in the installation process and will prevent any leaks from the beginning.


We have discussed the whole aircon leaking situation in complete detail and have listed some of the most common causes and their preventive methods. Thus now you know what causes aircon to leak and can identify the problem to solve it and prevent it in the future.

Ensure that you are well aware of any leaks since the beginning and can prevent them from escalating and worsening the situation. A little heed on your part will save you from a lot of hassle if you face any leaking situation.


1.    How do I stop an aircon leak?

Identify the cause behind the leak first. The causes behind the leak can be clogged drains or broken parts. Once you identify the cause, you can eliminate it to stop the leaking.

2.    Can I still use the aircon if leaking?

It is not advisable to use the aircon if it is still leaking. Using them during their leaks can interfere with their normal function, and you also risk causing a short circuit.

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