Furnace Leaking Water When AC is On? Here’s What You Need to Know

Discovering water around your furnace while running your air conditioning can cause concern. A furnace leaking water when the AC is on can result from several underlying issues and, if left unchecked, may lead to severe water damage or system malfunctions. Here’s a closer look at why this might happen, along with steps for proper furnace maintenance to prevent further issues.

Why is My Furnace Leaking Water?

While your furnace and air conditioner might seem unrelated, they share certain parts, particularly in systems where the furnace fan circulates cooled air. When the air conditioner runs, it generates condensation, which typically drains through a pipe. If there’s an issue with the drainage system, you may notice leaking around your furnace.

Common Reasons for Furnace Leaks:

1. Clogged Drain Line: A blocked drain line is the most frequent cause of water leaking from a furnace when the AC is on. Dust, dirt, and debris can clog the line over time, preventing water from properly draining and causing it to pool near the furnace. Regular furnace cleaning helps avoid these types of obstructions.
2. Broken Condensate Pump: Some systems have a condensate pump to move water out of the unit. If the pump fails, water has nowhere to go, resulting in leakage. In these cases, calling a furnace repair specialist is crucial to fix or replace the pump.
3. Improperly Sized or Installed Unit: An improperly sized or installed AC system can create excess moisture, leading to condensation buildup around your furnace. Professional furnace installers can ensure your system is set up correctly, preventing moisture issues from arising in the future.
4. Leaky Condensate Drain Pan: Over time, the condensate drain pan can rust or crack, allowing water to escape instead of draining away. HVAC technicians can identify these issues early during regular furnace inspections and recommend replacement.
5. Air Filter Blockage: A dirty or clogged air filter can restrict airflow, causing the evaporator coil to freeze. When it melts, excess water can overflow and create a leak. Routine furnace maintenance includes filter changes to keep airflow balanced and prevent freezing.

Preventing Water Leaks and Protecting Your Furnace

Regular furnace maintenance is essential for preventing leaks and ensuring your system operates smoothly. Scheduling periodic furnace inspections and furnace cleaning keeps drain lines clear and parts in good working order, reducing the risk of leaks and costly repairs.

When to Call Parker’s Air for Furnace Services

If you notice water pooling around your furnace, it’s time to call the experts. Parker’s Heating and Air Conditioning provides top-notch furnace repair, furnace replacement, and full-service furnace maintenance to keep your system functioning efficiently. Whether you need experienced furnace installers for a new unit or a quick furnace cleaning, we’re here to help. Contact us today to schedule a service with Parker’s Air and protect your home from water damage and furnace issues.