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Why Is My Ductless AC Leaking? A Phoenix Tech Answers

2020 Sep 02
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If your ductless AC is leaking, the most likely reason is that the drainage line is clogged. 

This is actually a fairly common issue among homeowners who have ductless AC systems, so it's nothing to worry about. 

Below, we'll look at why your drainage line is clogged, what you can do to unclog it, and how to prevent it from getting clogged in the future. We’ll also look at a few other reasons your ductless AC could be leaking, and what you should do about it. 


If you're not comfortable attempting to unclog your drain line yourself, we have a team of highly-trained pros ready and waiting. Just check out the ductless AC repair services we offer or schedule service today

Most common issue: Clogged drainage line

As we mentioned above, the most common reason why your ductless AC would be leaking is because of a clogged drainage line. 

Your AC system has two main jobs: to cool your home and to dehumidify it. When warm air from your home is sucked into your indoor ductless AC unit, that air passes over a part called an evaporator coil. The evaporator coil strips the air of heat and moisture, and the moisture is collected and moved out of your home by a drainage line. 

However, if a drainage line clogs, it can cause the moisture to spill out of your indoor AC unit and onto the floor. 

Most of the time, a clogged drainage line is from excess dirt, dust and debris that’s been building up in your indoor AC unit. 

The solution to this leak is to unclog your drain line. Here's how to begin: 

Note: If you're not comfortable trying to unclog your drain line yourself, feel free to reach out to George Brazil. We have helped hundreds of homeowners with their ductless AC systems, we'd be happy to help you too.

Step 1: Turn your AC system off.


Step 2: Remove the air filters. We would suggest vacuuming your filters and spraying them down with a hose before re-installing them. For now, leave them out of your indoor AC unit.

Step 3: Unscrew the front of your indoor AC unit. Depending on the make and model of your ductless AC system, the method for removing the front of your indoor AC unit may be slightly different. 

Step 4: The next step is to find and access your drain pipe. The drain pipe is usually located at the bottom of the indoor AC unit, closest to the wall. The drain pipe is secured by clips or sometimes screws. Either unclip or unscrew the drainage line and gently pull the drain pipe down towards the floor. 

Step 5: Make sure you have some kind of bucket to catch water before disconnecting the drainage line from the AC unit. Usually, the drainage line will have some kind of tape or wrapping around it. Carefully remove any tape and dump the contents of the line into the bucket.

Step 6: To ensure that the clog is removed, attach the end of the drain line to the end of a shop-vac. Turn the vacuum on for 30 seconds to 1 minute. This should help remove any clogs in the line.

Step 7: Reconnect the drainage line and reinsert it back into the bottom of the indoor AC unit. 

Step 8: Reattach the front panel of the indoor AC unit.

Step 9: Turn your AC system back on. If your AC works correctly and you don't notice any leaking after a few hours, you likely had a drain line blockage.

To prevent your drain line from becoming blocked in the future, you should ensure that your air filters are cleaned every few months and that you invest in annual maintenance with a professional. 

If you tried to unclog your drain line, but your AC system is still leaking, keep reading for other reasons why your AC may be leaking.  

Other reasons your ductless AC could be leaking

There are a few other reasons your ductless AC could be leaking, including: 

  • Broken or kinked hose
  • Issue with your drain pump
  • Damaged drain pan
  • Incorrectly-angled hose (instead of funneling water out of your home, if your hose isn’t angled correctly, it could be forcing water back into your indoor unit) 

If your AC was recently installed or maintained, our suggestion would be to reach out to the company or contractor who performed a service on your indoor AC unit. Your hose may not have been reinstalled correctly, which could have caused it to become kinked, broken or incorrectly angled. 

If your AC has not been recently installed or maintained, our suggestion would be to reach out to a professional team of HVAC professionals. If a part is broken—like your drain pan or pump—a tech will need to replace it for you. 

Need a professional’s help with your leaking ductless AC? Contact George Brazil

If you need service and aren't sure who to ask for help, reach out to George Brazil. We're Phoenix's most trusted HVAC professionals, so no matter what's going on with your ductless AC unit, you can count on us to correctly diagnose the issue and repair it quickly. 

Schedule service!