Air Conditioner Leaking Water?

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Why is my air conditioner leaking water?


Here at THA Heating, Air, & Plumbing, we know you all lead busy lives – between work, school, and family it can be hard to save a moment for yourself, let alone take care of annoying issues with your home maintenance. We want to make it easy for you, which is why we tackle a new topic for homeowners each week.


This week, we’re going to address leaky air conditioning units. You know, the ones that leave water pooling long enough to cause mold, rot, and damage. It helps to know what the cause is, so you can take care of the problem as soon as you spot it. There are several different causes of a leaking air conditioner, each involving different catalysts. Here’s a breakdown of five major issues leading to leakage:


Old, clogged air filter

Using a dirty air filter causes a lot more harm to your air conditioning system than you think and it wastes money. Your unit can’t cool as efficiently when there are dust and dirt particles blocking the flow of air. Eventually, if the thermostat is still set to cool, the evaporator coil within your machine will freeze the condensation its built up over time. Once this inevitably defrosts, the melting ice becomes a stream of water.


Failed condensate pump

The condensate pump is responsible for pumping water used by the air conditioning unit up and out of your home via the condensate drain line. When this malfunctions, it can lead to water pooling around your machine and plenty of headaches. If your air filter is clean, this might be your leak culprit. Call us to have a professional come to your home immediately and assess the problem. Don’t try to take on a project like this on your own!

Almost out of refrigerant

When air conditioning refrigerant is depleted, the evaporator coil behaves similarly to when an air filter is too dirty. The coil freezes over and causes water to leak from the machine. Unfortunately, when refrigerant is too low, or refrigerant leaks are beyond repair, it’s time to replace your air conditioning unit. Fortunately, we provide comprehensive help throughout the entire air conditioning replacement process.


Stopped up condensate drain

This is by far the number one cause of water leaking out from your air conditioning unit. The condensate drainage line can be blocked by any number of debris, like dirt, dust, mold, or build up. Although it is possible to unclog this yourself using a wet/dry vac, it’s better left to an expert so more damage isn’t done. The line may also have not been installed properly, and been knocked out of alignment by machine vibrations over the years.


Faulty drain pan

If your air conditioning unit is over 10 years old, it’s time to check your drainage pan. If it’s rusted through, water will be able to escape freely and not be directed towards the proper drainage area.



As soon as you see water leaking from your air conditioner, turn it off. This will prevent further damage to your phone, especially something as harmful as water damage.


If your air conditioning unit is not working properly, it absolutely requires an expert’s assistance. You may be experiencing water leaking from your air conditioning unit, poor air flow, or poor cooling. Call us at THA Heating, Air, & Plumbing so we can come inspect the problem, inform you of your options, and help you make the best informed decision possible! We offer reliable, fast service for any water heater repair. Schedule an appointment for air conditioning repair today!

Here at THA Heating, Air, & Plumbing, we know that it can be difficult to get ahead of the rising costs of home maintenance. Whether it be a water heater installation, a leaky faucet, or a malfunctioning septic tank – we are here to help. Our goal is to provide thorough plumbing services at an affordable cost, and arm you with the information you need to maintain your home. We want to simplify your experience by giving you access to reliable, reasonable appliance work, as well as boost your personal knowledge.  If you’re located in San Diego, call us at (858) 571-8865 to schedule your next repair, install, or anything else in between today!