The answer to 'why is my heat exchanger leaking water' is that the heat exchanger in your HVAC system has developed a crack or hole, causing it to leak water. This is a common issue that can occur due to normal wear and tear over time, corrosion, or physical damage.
Some common symptoms of a leaking heat exchanger include water pooling around the furnace, excess humidity in the home, and a musty or burning smell. If left unaddressed, a leaking heat exchanger can lead to more serious problems like water damage, mold growth, and even a complete furnace failure.