5 Reasons for a Leaky AC Unit & How to Fix It

Posted on July 31, 2017 by Chris Lancaster

A very common complaint with AC units is the leaking of water. This happens because the evaporator coil in your unit cools the warm air that blows over it, and condensation occurs as a result. That moisture is supposed to drip into a drip pan or drain line and go away from your home. You know you have a problem when you see this water elsewhere.

Here are some common causes for these leaks, and ways to fix them.

1. Dirty Air Filter

A dirty air filter will block airflow to the evaporator coil, causing the evaporator coil to become too cold and possibly freeze over. When the ice melts, it drips. This dripping may overwhelm the drip pan, and result in leaking water.

To correct this, have your air filter checked and replaced frequently (about every 1-3 months). If it is dirty, replace immediately.

2. Low Refrigerant

If your air conditioner is not cooling well, or you hear a hissing or bubbling noise, the refrigerant is leaking. When refrigerant is low, the pressure in the AC system lowers and causes it to freeze over and melt, much like the symptoms a dirty air filter causes. Depending on the severity of the leak, the leak may either be repaired or you may have to replace the entire AC unit.

3. Damaged or Rusted Drain Pan

The drain pan catches water that drips from the unit, and can become rusted and damaged over time. After around 12-15 years, this part will need replacement.

4. Clogged Condensate Drain Line

When the condensate drain line is clogged with dirt, dust, sludge or mold, water backs up into your home. A professional can use a wet/dry vac to unclog the condensate line. A clogged condensate drain line is one of the most frequent causes of water leaking from an AC unit.

5. Broken Condensate Pump

For units that are located in basements, a condensate pump pumps water outside of the home. When this breaks, water cannot leave the unit and backs up. Replacing this pump will amend the problem.

If your system’s aged and you think you need a replacement, we can help with that too. Lancaster Brothers proudly installs Lennox furnace and air conditioning systems. Check our Specials page for current rebates and special financing for qualified homeowners.

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My wife and I are very grateful for fitting our installation project as swiftly as you did. We had central air last night, and what a blessing. You men are the best.

Adam came back this morning to button a few things up… He is one terrific technician and person. You couldn’t have a better representative for your company than Adam.

– M.D.

Lancaster Brothers Heating and Cooling proudly serves the entire Kansas City area. If you notice any of the listed issues or notice that your unit is not working as efficiently as it was before, please contact us today. Our technicians will be glad to help diagnose the problem.