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Water leaking from the air conditioner.

Why is My AC Leaking Water?

Why is My AC Leaking Water?

Air conditioning units are essential for maintaining a comfortable indoor environment. However, it can be concerning to find water leaking from your AC unit. Understanding why your AC is leaking water can help you address the issue promptly and prevent further damage. In this blog, we’ll dive into the reasons behind AC water leaks and provide guidance on how to fix them.

Common Causes of AC Water Leaks

Clogged Condensate Drain Line

The most common cause of an AC leaking water is a clogged condensate drain line. Over time, dirt, dust, and debris can build up in the drain line, resulting in a blockage. When the drain line is clogged, the water has nowhere to go and backs up, eventually leaking out of the unit.

Dirty Air Filter

A dirty air filter can restrict airflow over the evaporator coil, causing the coil to freeze. When the coil melts, the excess water may overflow the drain pan and leak out of the unit. You can prevent this issue by consistently changing and cleaning your filters.

Low Refrigerant Levels

Low refrigerant levels can also cause the evaporator coil to freeze. As the refrigerant levels drop, the pressure in the system decreases, leading to the coil icing over. When the ice melts, it can create an overflow situation similar to a dirty air filter.

Damaged or Rusty Drain Pan

The drain pan collects water that drips off the evaporator coil. If the drain pan is damaged or rusty, it may not hold the water effectively, leading to leaks. Inspecting and replacing a damaged drain pan can resolve this issue.

Improper Installation

If your AC unit was incorrectly installed, it might not be level, causing water to pool and eventually leak out. Ensuring proper installation and leveling of your unit is crucial to prevent leaks.

Blocked Condensate Pump

In some AC units, especially those in basements or attics, a condensate pump is used to pump out the water. If the pump fails or is blocked, the water will not be removed properly and can lead to leaks.

How to Fix a Leaking AC Unit

  1. Clear the Condensate Drain Line: Locate the drain line and use a wet/dry vacuum to remove the blockage. You can also use a long, flexible brush to dislodge any debris inside the line. Regular maintenance can help keep the drain line clear.
  2. Replace or Clean the Air Filter: Check your air filter regularly and replace or clean it as needed. This ensures proper airflow and helps prevent the evaporator coil from freezing.
  3. Check Refrigerant Levels: If you suspect low refrigerant levels, contact a professional HVAC technician to check and recharge your system. Low refrigerant levels usually indicate a leak that needs to be addressed by a professional.
  4. Inspect the Drain Pan: Examine the drain pan for any signs of damage or rust. If you find any issues, replace the drain pan to ensure it can hold and drain water effectively.
  5. Ensure Proper Installation: If you suspect your AC unit was not installed correctly, have a professional HVAC technician inspect and correct the installation. Proper leveling is essential to prevent water pooling and leaks.
  6. Maintain the Condensate Pump: Regularly inspect the condensate pump to ensure it is working correctly. Clean the pump and remove any blockages that may prevent it from operating effectively.

Reliable AC Services in Central Maryland

Understanding why your AC is leaking water is the first step in addressing the problem and preventing further damage. Regular maintenance can help prevent many common causes of AC leaks. However, some issues, such as low refrigerant levels or improper installation, require professional assistance.

For all your air conditioning needs in Central Maryland, contact W.L. Staton Plumbing, Heating & Cooling. Don’t let a leaking AC disrupt your comfort—reach out to us today for expert service and support.


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