Skip to Content

Causes and Symptoms of AC Drain Clogs


One of the most important components of your air conditioning unit is the condensate drain. After all, this is what enables your AC to properly drain water out of your home, preventing standing water in the process. Unfortunately, there are some instances when your AC’s drain can become clogged. But how exactly does this happen? Here, HVAC and air conditioning experts from John Stevenson Plumbing, Heating & Air Conditioning, Inc. reveal the causes and symptoms of AC drain clogs.

Causes of Clogged AC Drains

There’s only one reason why your air conditioning unit’s drain gets clogged. According to professionals, the moisture that drips off of your AC’s evaporator coil can carry dirt and other airborne particles from your home’s air with it. Once the dirt and debris build-up to a significant amount in your AC’s drain, it can cause a clog in the unit.

Signs of AC Drain Clogs

There are a few signs which signal that your AC unit is experiencing a clogged drain. When you’re looking for such signs, consider checking on the AC’s condensate pan; if it’s full time and time again, it’s likely that there’s a problem with your AC’s drain line that will have to be repaired immediately, as it could encourage mold growth around your home otherwise. According to heating installation and air conditioning professionals, water spots around the unit are also signs of AC drain clogs.

How to Prevent AC Drain Clogs

As stated before, the buildup of dirt and airborne particles in your AC drain is the common cause of AC drain clogs. To prevent this from occurring, it’s highly recommended that you regularly replace your air filters. In this way, you can limit the amount of dirt and other particles that make their way into the water that drains from your system. In addition, you can also keep up with your unit’s annual maintenance so professionals can fix any issues that they may find during the inspection.

If your system is still draining water properly? Do you need a professional to do some work on your air conditioning unit? If so, look no further than John Stevenson Plumbing, Heating & Air Conditioning, Inc., your leading service provider when it comes to your air quality and needs. Give us a call at (760) 276-6690 or fill out our contact form to request our services. We serve homeowners in Orange County and other nearby areas.