The answer to 'furnace leaking water' is that a leaking furnace is a common issue that can have several potential causes. The most frequent reasons for a furnace leaking water include a clogged condensate drain line, a cracked heat exchanger, or issues with the furnace's humidifier.
If your furnace is leaking water, you'll likely notice the water pooling around the base of the unit. This can lead to water damage and even mold growth if left unchecked. In many cases, the problem can be resolved with a simple DIY fix, such as clearing a blocked condensate line. However, more serious issues like a cracked heat exchanger may require the attention of a professional HVAC technician.