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May 09, 2023  Taylor Salisbury

Why Is My Mini-Split Leaking Water?

If you have a mini-split air conditioning unit in your home or office, you may have experienced water leakage from the unit. While it’s normal for an air conditioning system to produce condensate, leaking water can be a cause for concern. A leaking mini-split not only causes damage to your property but also affects the efficiency of the unit and shorten its life. In this blog post, we will discuss the common reasons why mini-splits leak water and what you can do to prevent it. Understanding the causes of water leakage from a mini-split can help you take the necessary steps to maintain and care for your unit, ensuring its longevity and efficiency.

Why Do Mini-Splits Leak Water?

Assuming that the air handler was installed correctly, there are two reasons why it will leak water: a clogged drain line and a frozen evaporator coil.

A Clogged Drain Line

This is the most common reason for a leaking mini-split. Over time, dirt, dust, biological growth, and other debris can accumulate in the drain line and cause a blockage. With nowhere for the condensate to flow, it backs up and leaks out of the unit.

water leaking from a mini-split air handler

The Evaporator Coil Freezes Up

Dirty air filters restricting airflow or low refrigerant are a couple things that can cause coils to freeze up. When the e-coil freezes up then thaws, it can create excess water that leaks out of the unit. Making sure the indoor unit is well maintained will prevent this from happening.

If your mini-split is leaking water, it’s always recommended to have a certified HVAC technician identify the root cause of the leak and take the necessary steps to repair it.

Tips to avoid a leaking mini-split

  • Regular maintenance: Regular maintenance of your mini-split unit can help prevent water leaks. This includes cleaning the air filters, checking the drain pan and drain line for clogs or damage, and inspecting the unit for any signs of wear and tear. Using a mold and mildew inhibitor also helps to prevent growth and potential clogging down the road.
  • Proper installation: Make sure your mini-split unit is installed properly by a qualified HVAC technician. This includes adding products like a mini-split condensate pump to prevent any buildup of water.asurity quietmini
  • Keep the area around the unit clear: Keep the area around the indoor unit clear of any obstructions that could block airflow, such as furniture or curtains. This will help ensure proper airflow and prevent the evaporator coil from freezing up.
  • Check the refrigerant level: Have a professional HVAC technician check the refrigerant level in your mini-split unit regularly to ensure it is not too low, which can cause the evaporator coil to freeze up and lead to water leaks.
  • Use a water alarm: Consider installing a water alarm near the mini-split unit to alert you if water is detected. This can help you identify and address any leaks early before they cause damage.

By following these tips, you can help prevent water leaks from your mini-split unit and ensure it operates efficiently and effectively for years to come.

Learn more about Asurity’s line of condensate management products at www.diversitech.com and see all the available solutions for mini-split and traditional ducted systems.


Published by Taylor Salisbury May 9, 2023