7 Common Mini-Split Problems and How to Fix Them

July 12, 2021
Ac vent outside house

Having mini-split installation done is a good approach to solve comfort problems in your residence. These systems don’t have to have ductwork to give energy-efficient heating and cooling. Like any other home comfort system, they can run into problems from time to time. Here are seven of the most frequent mini-split issues and how you can fix them.

1. Mini-Split is Dripping Water or Not Draining Water

If your mini-split is dripping water or not draining water, there might be a problem with the condensate drain or drain line. It’s typical for a drain line to be clogged with mold, force water to back up, and spill. Reach Winters Heating and Cooling at 317-406-5382 for help and we’ll get your drain unblocked quickly.

2. Mini-Split is Making Noise

Mini-splits normally don’t make much noise when they’re running. But there are a few instances where they might make sounds.

  • Popping or clicking: This can be because of the plastic housing expanding or contracting while the system is operating.
  • Swooshing, crackling or gurgling: This can happen if your mini-split turns on defrost mode to stop itself from freezing up.

You shouldn’t be troubled if you hear these noises as they’re expected. However, if your mini-split keeps switching into defrost mode, it’s a clue that something is wrong, like low refrigerant, a flawed circuit board, or defective sensors. Your Winters Heating and Cooling HVAC technician will be able to locate and resolve the situation quickly.

3. Mini-Split Is Not Heating or Blowing Hot Air

If your mini-split is not heating or blowing hot air, ice on the coils could be the problem. Like we talked about prior to this, frozen coils could be the effect of not enough refrigerant, a faulty circuit board or broken sensors. Call us at 317-406-5382 for support.

4. Mini-Split Is Not Cooling or Blowing Cold Air

If your mini-split is not cooling or blowing cold air, there could be a refrigerant leak. Your mini-split AC uses refrigerant to move heat and keep your residence cold. These leaks must be repaired by a licensed HVAC tech, so call us at 317-406-5382 for help.

5. Mini-Split Is Not Dehumidifying

Much like an air conditioner, a mini-split does a great job at dehumidifying during the summer. However, this may be stopped by clogs in the condensate drain line. Another reason your mini-split air conditioner may not be dehumidifying very effectively is if it’s too large. A system that’s too large will cool down an area too fast without having a moment to dehumidify it. Mini-split size is based on square footage and BTUs.

6. Mini-Split Smells

If your ductless mini-split smells, it’s trying to grab your attention that something is wrong. Here are five of the most typical smells and what they mean.

Musty, Sour, or Mildew

If your mini-split smells musty, sour, or mildew, you likely have a mold issue. Have a specialist like Winters Heating and Cooling check and rinse the condensate drain and drain line, if required.


If your mini-split smells like vinegar or has a sweet odor, you’re possibly experiencing a refrigerant leak. Another sure hint that you don’t have sufficient refrigerant is a low concentration of cold air. Contact us at 317-406-5382 for assistance.


If your mini-split smells like fish, a few things could be wrong. Sometimes this smell means there are electrical issues or that there’s a leak. Either way, reach us at 317-406-5382 for support.

7. Mini-Split Will Not Power On

If your mini-split will not power on, examine the remote first. If the batteries are bad, your mini-split won’t turn on. In most instances, replacing the batteries will solve the situation. If you’re still running into trouble, call us at 317-406-5382.

Depend on Us for Your Mini-Split Repair Needs

When you need mini-split repair or air conditioning repair in Franklin & South Indy, get in touch with the company your neighbors and friends have relied on since 2019. Quality service, competitive prices, and your comfort are our main priorities! Reach us at 317-406-5382 to schedule your appointment today.