AC Unit Leaking Water | General Heating and Air Conditioning

Why is my air conditioner leaking water?

Carrier Air Conditioner

Why is my air conditioner leaking? This is one of those common questions people ask Google and the internet, trying to understand.

Water has started to come out of your indoor air conditioning unit, and you are becoming concerned at this.

Before you do anything else, you want to turn off your air conditioner, as water and electricity do not mix. The water can cause damage to your air conditioner.

From there, you will need a HVAC professional to assist you with fixing this issue. However, here is an article that outlines what is actually happening with your air conditioner.

Why water collects in the indoor unit of a central air conditioner:

This is more of the why before we get into the actual problem at hand.  A large part of your AC unit’s job is to remove humidity from the air, and the unit will pull in air then pass it over the cold evaporator coil to cool the air down, helping reduce the humidity.

As this happens, water droplets form on this evaporator coil. (Think of how a glass of water sweats in the Wisconsin heat). Gravity pulls this water into a drain pan and down a condensate drain line. This line then usually releases the waste inside, outside, or into the plumbing.

When do you have an issue? An issue with any of these parts will cause water to begin collecting inside the unit.

Here are some problems that are fairly typical causes of this issue:

1. Your evaporator coil could be frozen. If it is frozen, when it thaws, the water can overflow the drain pan, and the excess water will fall onto the floor outside the unit.

Why would your evaporator coil freeze?

– Your air filter is dirty – This will block airflow, causing the temperature to drop.

– Your refrigerant is low – This causes the coil to become cooler than usual, and again, causing it to freeze.

2. Your condensate drain line could be clogged

When the drain line is clogged, the water doesn’t have anywhere to go except back. Therefore, this causes the water collection as well. A wet-dry vacuum can be used to clean out the outdoor condensate pipe, in an attempt to remove whatever is causing the blockage.

3. You could also have a dirty evaporate coil. An HVAC professional will need to clean this part; it is a part of air conditioning unit maintenance.

4. Your unit could have never been installed correctly

If your AC unit is on the new side, there is a chance that the problem is related to installation. If a condensate trap is not designed well, the condensate that collects cannot drain, which causes overflow into your home. A professional will need to fix this issue if that is the cause.

There are other causes as well, but these ones are likely the biggest culprit.


The professionals at General Heating and Air Conditioning are ready and available to help you with keeping your home comfort system running smoothly. Contact us online or call us at (608) 271-3900.

Did you like this article? Check back weekly for more tips and tricks about your home comfort system.