Finding water pooling around your furnace is never a good sign. While it may seem like a plumbing issue, it’s often your furnace that’s to blame. A leaking furnace not only is a sign of a potential mechanical or drainage problems but can also lead to property damage, mold growth, and costly repairs if ignored. Absolute P&M Services would like to share what causes your furnace to leak water and the first step toward fixing it quickly and preventing further damage.
Condensation Leak from Furnace
If you have a high-efficiency condensing furnace, a water leak could be due to condensation that isn’t draining properly. These furnaces are designed to extract more heat from combustion gases, which causes condensation to form. The moisture is usually directed through a condensate drain line to your floor drain. Check for visible cracks or blockages in the drain tubing. If you see standing water, your condensate line may need to be cleared or replaced. Have an HVAC technician inspect the drain system and pump to ensure everything is flowing properly.
Leaky or Clogged Condensate Drain Line
Even in standard furnaces, condensation can occur if your system is paired with a central air conditioner. The air conditioner’s evaporator coil sits on top of the furnace and shares the same drainage system. If the drain line becomes clogged, the water can back up and overflow, appearing as if it’s coming from the furnace. Turn off your HVAC system and inspect the condensate drain line for blockages. You can try using a wet/dry vacuum to remove clogs, but if the problem persists, call a professional to clean or replace the line.
Faulty Secondary Heat Exchanger
In high-efficiency furnaces, a secondary heat exchanger extracts additional heat from exhaust gases, which generates condensation. If this heat exchanger cracks or becomes blocked, water can escape into the furnace cabinet. This is a serious issue that requires immediate professional attention. A cracked heat exchanger can also allow dangerous carbon monoxide to leak into your home, so shut off the furnace and call a certified HVAC technician right away.
Improper Furnace Installation or Venting
If your furnace was not installed correctly, condensation may not drain where it should. Improper vent pipe angles or poor sealing can cause water to accumulate and leak around the furnace base. A professional can inspect the venting system to ensure it is properly installed and sealed. Correcting installation or venting errors can stop leaks and improve furnace efficiency.
When to Call a Professional Heating Contractor
While some small leaks are caused by simple clogs or loose connections, others can point to more serious mechanical or safety issues. You should call a professional HVAC technician if:
• Water continues to pool after you clean the drain line.
• You see rust or corrosion inside the furnace.
• Your furnace is making strange noises or shutting off frequently.
• You suspect a cracked heat exchanger.
Ignoring water leaks can lead to extensive damage, not just to your furnace, but also to flooring, drywall, and insulation.
Furnace & Boiler Heating Maintenance, Repairs, Replacement & More in Santa Fe, Tomball, Sugar Land, Galveston, Austin & Greater Houston, Texas
A furnace leak is more than just a nuisance. It’s a red flag that something isn’t functioning correctly. From clogged condensate lines to failing heat exchangers, several issues could be behind the problem. If you notice water around your furnace, turn off the system and schedule an HVAC inspection immediately. For Furnace and other HVAC repairs, contact Absolute P&M Services today.
