Back to Blog

Water on Laminate Floor

Why is My HVAC Leaking Water?

If you’ve noticed your HVAC system is leaking water, you’re likely concerned about the potential damage to your home and the effectiveness of your heating and cooling system. Water leaks from HVAC units can be caused by a variety of issues, ranging from simple fixes to more complex problems that require professional intervention. In this blog post, we’ll explore the common reasons for HVAC water leaks and provide you with practical troubleshooting tips to help you identify and resolve the issue. Whether it’s a central AC leaking water or a condensate pump issue, understanding the root of the problem is key to finding a reliable solution.

Common Causes of HVAC Water Leaks

1. Clogged Condensate Drain Line

One of the most frequent culprits behind an HVAC leaking water is a clogged condensate drain line. This line carries condensation from the indoor unit to the outside, but over time, it can become clogged with dirt, dust, and other debris. When this happens, water backs up and can start leaking onto the floor. Regular maintenance and cleaning of the condensate line are essential to prevent this issue.

2. Damaged or Rusted Drain Pan

Older HVAC units often have metal drain pans that can rust and corrode over time. If the drain pan becomes damaged, water may begin to leak out of the HVAC unit. Inspecting the drain pan annually for signs of damage and replacing it if necessary is a good practice to prevent water damage from leaks.

3. Improper Installation of Condensate Pump

If your HVAC system includes a condensate pump, proper installation and function are crucial. A condensate pump leaning or not properly aligned can lead to ineffective operation and water leakage. Ensure that the pump is level and that it’s operating as it should to avoid any issues with water drainage.

4. Frozen Evaporator Coils

During the hot months, the evaporator coils in your AC unit can freeze due to low refrigerant levels or inadequate airflow, which can result in a water leak when the ice melts. Ensuring your system has the correct amount of refrigerant and that your air filters are clean will help prevent coils from freezing.

5. Disconnected Air Ducts

Sometimes, the issue may be with the air ducts themselves. Disconnected ducts can cause condensation to form in areas not intended for water collection, leading to leaks. Regular inspections of your ductwork can help identify and rectify this problem early.

Troubleshooting Tips

To effectively address the problem of an HVAC leaking water on the floor, here are some troubleshooting tips:

  • Inspect the Condensate Drain Line: Check for any clogs or obstructions and clear them if found. A wet/dry vacuum can be useful for this task.
  • Check the Drain Pan: Look for any signs of damage or corrosion. If the pan is damaged, replacing it is usually the best option.
  • Evaluate the Condensate Pump: Make sure the pump is properly aligned and functioning correctly. Listen for any unusual noises that might indicate a malfunction.
  • Assess the Airflow: Regularly replace or clean air filters to ensure proper airflow through the coils. Blocked airflow can lead to freezing and subsequent leaking.
  • Monitor Refrigerant Levels: Low refrigerant levels can be a cause of frozen coils. If you suspect this is the case, contacting a professional for a refill and system check is advisable.

When to Call a Professional

While some water leaks can be resolved with basic troubleshooting, there are situations where it’s best to call in the professionals. If you’ve gone through the above steps and your HVAC is still leaking water, or if you suspect the issue is related to your AC’s condensation line but can’t pinpoint the problem, professional help is necessary. Additionally, if your system needs a refrigerant refill or there are electrical components involved, it’s safer and more efficient to rely on expert services.


Dealing with an HVAC leaking water can be stressful, but understanding the common causes and knowing how to troubleshoot the issue can greatly help in managing the situation. Regular maintenance is key to preventing leaks and ensuring your HVAC system operates efficiently. If you encounter complex issues or need assistance with maintenance, don’t hesitate to call The Comfort Authority. Our team of experts is equipped to handle all your HVAC needs, ensuring your system remains in top condition throughout the year.