Why is Air Conditioner Leaking Water & Causes for Leakage?

Why is Air Conditioner Leaking Water?

It’s been quite surprised when we observe water leakage from the Air conditioner unit, right! And then get’s panic about that something wrong has happened in our Air conditioning unit. We then immediately, make a call to the serviceman to clear the issue. But, have you ever thought why is it happening so? If you are also one among those panic people which I have mentioned before, then you don’t actually need to panic at all when you know the answer for Why is Air Conditioner Leaking Water? 

Basically, the water leakage in the air conditioner is quite normal in any type of Air Conditioner. The main reason for the water leakage is the condensation of the cold coils in the inner unit of an AC which helps the blower to blow cool air while running results in the water drips and leaks out through a pipe attached to it.

To make simple, Condensation happening to the cold coils is the main reason for the water leakage.

I know that some of you are not aware of these confusing terms like cold coils, condensation,…etc if you are not familiar with this. So, this article will provide the details like causes and fixings of the water leakage in an AC from the basics.

So, in order to understand the details let us know how does an AC produces water by its operation.

air conditioner leaking water

How Does AC produce Water by Condensation?

Beginning this answer with its operation, the working of an AC involves mainly 4 components. Namely, 


Condenser (Set of Coils)

Expansion Valve

Evaporator (Set of Coils)

And also a liquid component called Refrigerant

Refrigerant is a cooling agent filled in both the connected coils of the Condensor and evaporator. This refrigerant will increase its pressure by passing through the compressor which converts the normal pressure of the liquid to high pressure.

The high-pressure liquid is then passed through the condenser(set of coils) unit which normally has a little high temperature. This temperature is blown outside with a fan attached to it. This high-pressure refrigerant is then passed through the expansion valve which converts the high pressure of the liquid to the low pressure of liquid because by converting high-pressure to low pressure the temperature will reduce very low and causes the cool effect.

And this cold liquid is then passed through the evaporator and make the coils of the evaporator to very cold (less than room temperature). A fan fixed behind the coils blow the air through these coils and thus blow cool air.

This is how an AC produces cool air, and now let us know how does AC produces water? The cold refrigerant passing in the evaporator makes the coils cool and these coils are then condensed by the air taken inside the room.

The hot/humid air in the room then condenses the evaporator and results in dripping off the water. So, this is how an AC produces water by condensation…

Generally, condensation means converting the vapor or gas to a liquid form. This condensed water is called condensate and the component used to drain out the condensate is called the condensate pump.

OK, till now you have learned the production of water in AC and we know that the flow of condensate is normal in proper use, but there are some situations where the flow of refrigerant is continuous all day long.

On that note, let u know the reasons behind it along with problem fixes.

Causes for Air Conditioner Leaking Water along with immediate Fixes

As the process of condensation is common in any type of Air conditioner but its fixes may vary. So, let us clear some causes by one after the other with an immediate fix.

Pressure Increases:

The AC unit needs to have more space outside as the pressure level might get increases at the condenser, which results in high-pressure formation and leaves very low pressure. This low pressure will increases the coldness of the coils and results in high water drips off from the evaporator.

Immediate Fix:

Try to fix the outer unit of an AC free from any opposite coverings which will not allow the airflow freely outside.

Clogged Drain Line:

If you are sure about the free space for an outer unit of AC then come to the Dain line. The use of the drain line is to drain out all the dripped off water from an AC. But sometimes this hole gets blocked by dirt, insects..etc. So, the blocked line cannot allow the drain water outside and allows the water back in the pan(dripped water collector) which causes leakage.

Immediate fix:

In order to fix the solution, we need to clean the pan, water outlet pipe with a suitable tool and fix it in its place.

Loose Seals:

A properly fixed/sealed unit can prevent the ac from pools of water. The improper/loose seals will allow the hot air inside the unit and increase the slow process of condensation to speedy condensation by the hot air. The increased water drips will result in more water leakage.

Immediate Fix:

This problem mostly happens when the unit is refitted several times. So, we need to be sure about the leaks while fitting every time.

Low Level of Refrigerant:

Refrigerant is also one of the main things for the cooling effect in the room. The decreasing quantity of a refrigerant will result in forming more coldness to the evaporator(set of coils). More the coldness more will be the water drippings.

Immediate fix:

There are several types in the refrigerants to fill in the coils of an AC. So, choose the best fluid while filling by comparing the refrigerants of AC in the market.

And also check out the video which might help you to fix the problem of water leakage in AC.

Finally, it is to say that whenever you try to fix a problem in AC you need to shut the main power supply of it right before your fixing. 


I hereby concluded that the problem causing is common in any type of electric and electronic component but we can overcome this only by maintained. Proper maintenance of AC in-particular intervals will save you from spending more money on repairing.

Frequently Asked Questions:

Q) Where is my AC drain line? The drain line is located near to the condenser which is outside unit present outside of your room, in the case of split AC.

Q) How much condensation is normal for an air conditioner? The amount of condensation depends on the amount of humidity present inside a room or the area where the internal unit is fixed.

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