What to Do If Your HVAC System is Leaking Water

September 15, 2025

Few things are more alarming than finding a puddle of water around your HVAC system. Not only is it frustrating to clean up, but it also raises concerns about potential damage to your Colorado, home and the system itself. While some issues may be simple to troubleshoot, others require a professional technician’s help. 

Understanding the common causes of HVAC water leaks will help you act quickly, protect your home, and avoid more costly repairs down the road. Reach out to an authorized dealer from Carrier Colorado for professional assistance.

Why Your HVAC System Might Leak Water

Water leaks from HVAC systems often come down to one of a handful of issues. Some are simple maintenance-related problems, while others are signs of a deeper mechanical concern. Here are the most common causes:

Clogged Condensate Drain Line

Your HVAC system removes humidity from the air, which produces condensation. This water normally drains away through a small condensate line. Over time, dirt, algae, or mold can clog the line, causing water to back up and pool around your unit.

Damaged or Rusted HVAC Drain Pan

The drain pan collects condensation before it exits through the line. If the pan is cracked, rusted, or improperly positioned, water will leak directly onto the floor. This problem is especially common in older systems.

Frozen Evaporator Coils

If the system isn’t getting enough airflow—often due to a dirty air filter, blocked vents, or low refrigerant levels—the evaporator coils can freeze over in an air conditioner unit. When the ice melts, the excess water can overwhelm the drain pan and cause leaks.

Low HVAC Refrigerant Levels

Refrigerant is what allows your HVAC to cool the air. When levels are too low, it can cause the evaporator coil to drop in temperature, freeze, and later thaw, leading to water overflow.

Improper HVAC Installation

In newer systems, leaks can sometimes be traced back to improper installation. An incorrectly sized unit or poorly connected drain line can create persistent water issues.

Troubleshooting an HVAC Water Leak

Before calling in a technician, there are a few steps Colorado, homeowners can safely try. These quick checks can sometimes resolve the issue or at least give you a clearer picture of what’s going wrong.

Check and Replace the Air Filter

A dirty or clogged air filter is one of the most common causes of reduced airflow and frozen coils. If you notice your filter is gray or visibly dirty, replace it right away. A fresh filter can prevent future freeze-ups and help your system run more efficiently.

Inspect the Condensate Drain Line

Locate the drain line (usually a small PVC pipe near the indoor unit) and check for blockages. You can use a wet/dry vacuum to suck out debris, or carefully flush the line with a mixture of vinegar and water to clear any mold or algae growth.

Examine the Drain Pan

Shine a flashlight into the pan beneath the unit. If you notice cracks, holes, or heavy rust, the pan likely needs replacement. For temporary relief, you can place a waterproof container beneath the leak until a technician replaces the damaged pan.

Turn Off the System if Coils are Frozen

If you see ice buildup on the evaporator coils, turn off the system to allow it to thaw. Continuing to run the unit in this condition can damage the compressor. Once thawed, replace the filter and check for airflow blockages, but call a professional if the problem keeps happening.

When It’s Time to Call a Professional

While some causes of leaks can be resolved with basic maintenance, others require the tools and expertise of a Colorado-licensed HVAC technician. You should schedule service if:

  • The drain line remains clogged despite cleaning attempts.
  • The drain pan is damaged or rusted beyond repair.
  • You suspect low refrigerant levels or a refrigerant leak.
  • The evaporator coils keep freezing even after replacing filters and ensuring proper airflow.
  • You’re unsure of the cause and don’t want to risk further damage.

A technician will not only address the immediate leak but also perform a full system inspection to ensure your HVAC is running efficiently and safely.

Preventing Future HVAC Leaks

The best way to handle HVAC water leaks is to prevent them in the first place. Regular maintenance can go a long way in keeping your system healthy.

  • Change filters regularly. Aim for every 1–3 months, depending on system use and household conditions.
  • Schedule annual tune-ups. Professional maintenance can catch small issues before they turn into bigger problems.
  • Keep the area around your unit clean. Clear away dust, debris, and clutter that can interfere with airflow.
  • Flush the drain line annually. A simple vinegar rinse can prevent algae buildup.

By making these habits part of your routine, you can significantly reduce the chances of unexpected water leaks.

Protecting Your Home and Your Comfort

A leaking HVAC system is more than just an inconvenience—it can cause water damage, encourage mold growth, and shorten the lifespan of your equipment. While some minor leaks can be fixed with simple DIY steps, others require professional expertise to resolve. The key is to act quickly, prevent further damage, and maintain your system so leaks are less likely to occur in the first place.

With the right combination of homeowner vigilance and professional support, you can keep your HVAC system running smoothly and your Colorado, home safe from water damage. Contact an authorized dealer from Carrier Colorado if your HVAC is leaking and the standard troubleshooting is not resolving your issue.