Why is My Furnace Leaking Water? (And 5 Things You Should Do Right Now)
Finding a puddle around your furnace in the middle of a Durham winter is unnerving. While some leaks are minor maintenance issues, others can signal a critical failure. At Hatco Heating & Air Conditioning, we see this often. Here is a breakdown of why your furnace is leaking and the exact steps you should take to protect your home.
Common Causes
1. High-Efficiency Condensation Issues Modern, high-efficiency furnaces create water as a byproduct. If the white PVC exhaust pipes or the condensate pump are blocked, that water has nowhere to go but your floor.
2. Integrated Humidifier Leaks Many Durham homes feature whole-home humidifiers built into the HVAC system. If the humidifier pad is clogged with mineral deposits or the inlet valve is leaking, you'll see water pooling at the base of the furnace.
3. Clogged Furnace Filter A dirty filter restricts airflow, causing the internal coils to ice up and eventually melt. Check your filter—if it’s grey and dusty, it’s a likely culprit.
4. Secondary Heat Exchanger Failure This is a serious technical issue. In high-efficiency units, the secondary heat exchanger can corrode over time. As an authorized Lennox and Rheem dealer, we can help determine if your unit is under warranty.
Immediate Action Plan
Turn off the System: Use the furnace switch or your thermostat to shut it down.
Clear the Water: Use towels or a wet-vac to prevent damage to your flooring.
Check the Filter: If it's soaked or dirty, remove it.
Call a Professional: A leak rarely fixes itself; early intervention saves money.
Expert Furnace Diagnostics in the Durham Region.
Don't let a small leak turn into a flooded basement. Whether you’re in Ajax, Pickering, or Whitby, Hatco’s TSSA-certified technicians are ready to restore your comfort.