Walking into your basement and discovering a puddle around your furnace is never a good feeling. Is it a small fix or a major problem? Should you be worried about water damage or system failure?
A leaking furnace (or AC unit) can be caused by several factors, from clogged drain lines to condensation issues and even air conditioning malfunctions. Before you panic, let’s go through a step-by-step troubleshooting guide to help you identify the cause and the best way to fix it—so you can get back to a comfortable and worry-free home.
1. Condensation in High-Efficiency Furnaces
High-efficiency furnaces (with an Annual Fuel Utilization Efficiency rating of 90% or higher) generate condensation as part of their operation. This condensation is typically expelled through a drainage system. If the condensate drain becomes clogged or the tubing is damaged, water can back up and leak around the furnace.
Solution: Inspect the condensate drain lines for blockages or cracks. Clear any obstructions and replace damaged tubing as necessary. Regular maintenance can prevent these issues.
2. Issues with the Humidifier
Many furnaces are equipped with built-in humidifiers to maintain indoor air quality. If the humidifier’s water lines are cracked or the drain is clogged, it can cause leaks that appear to originate from the furnace.
Solution: Examine the humidifier’s components, including water lines and the drain system. Repair or replace any faulty parts and ensure the drain is clear to prevent water accumulation.
3. Clogged or Disconnected Drain Lines
Both furnaces and air conditioners produce water that needs to be drained away. A shared condensate drain line can become clogged with debris or algae, leading to water backing up and leaking near the furnace.
Solution: Check the condensate drain line for obstructions or disconnections. Use a wet/dry vacuum or a plumber’s snake to clear clogs, and securely reconnect any loose lines.
4. Malfunctioning Condensate Pump
In systems where the furnace and AC are located below ground level, a condensate pump is used to move water to an appropriate drainage point. If this pump fails, water can accumulate and leak.
Solution: Test the condensate pump by pouring water into its reservoir to see if it activates. If it doesn’t, inspect for power issues or blockages. A faulty pump may need to be repaired or replaced.
5. Leaking Air Conditioner Affecting the Furnace
During cooling seasons, the AC extracts moisture from the air, which drains away through a condensate line. If this line is clogged or the drain pan is damaged, water can overflow and leak onto or around the furnace, making it seem like the furnace is leaking.
Solution: Inspect the AC’s condensate drain line and drain pan for blockages, cracks, or disconnections. Clear any clogs and repair or replace damaged components to ensure proper drainage.
6. Blocked Exhaust Vent
In conventional furnaces, exhaust gases are vented through a flue. If this vent is blocked or improperly sized, condensation can form and leak into or around the furnace.
Solution: Examine the exhaust vent for obstructions, such as debris or animal nests, and ensure it is appropriately sized and installed. Clearing blockages and correcting installation issues can prevent condensation buildup.
7. Dirty Air Filters Leading to Frozen Coils
A dirty air filter restricts airflow, causing the evaporator coil to freeze on AC. When the ice melts, it can overwhelm the drain pan, leading to water leakage around the furnace.
Solution: Regularly check and replace air filters to maintain proper airflow. If you notice ice buildup, turn off the system to allow it to thaw and address any underlying airflow issues.
Preventive Measures for AC or Furnace Leaking Water
- Regular Maintenance: Schedule annual inspections with a qualified HVAC technician to identify and address potential issues before they lead to leaks.
- Monitor System Performance: Keep an eye on your HVAC system’s performance, and promptly address any unusual noises, odors, or water accumulation.
- Maintain Clean Components: Ensure that filters, drain lines, and other components are clean and free of debris to promote efficient operation.
Don’t Let a Leaky Furnace Turn into a Bigger Problem!
If you’ve gone through the troubleshooting steps and still can’t pinpoint the problem, or if the leak keeps coming back, it’s time to call the experts. At B&B ClimateCare, our experienced technicians can diagnose and repair your furnace quickly, ensuring your home stays dry and comfortable. Contact us today for a professional inspection and peace of mind!
