Furnace Water Leak

5March 2023

Goodman Furnace Water Leak: Troubleshooting and FAQ

A water leak from your Goodman furnace can be a serious issue. Not only can it damage your home, but it can also cause problems with your furnace’s performance. In this post, we’ll cover some troubleshooting steps to help you identify the source of the leak and provide answers to some frequently asked questions.

Troubleshooting Steps:

  1. Check the Condensate Drain Line: One of the most common causes of a water leak from a Goodman furnace is a clogged or disconnected condensate drain line. If the drain line is clogged, water can build up and overflow, causing a leak. Check the drain line for clogs or disconnects and clear or reconnect it as needed.
  2. Inspect the Secondary Heat Exchanger: The secondary heat exchanger on your Goodman furnace can sometimes develop cracks or rust, which can lead to water leaks. Inspect the heat exchanger for any signs of damage and replace it if necessary.
  3. Check the Flue Pipe: A leak from the flue pipe on your Goodman furnace can also cause water damage. Inspect the flue pipe for any cracks or gaps and seal them with high-temperature silicone if needed.
  4. Examine the Humidifier: If your Goodman furnace has a built-in humidifier, it could be the source of the water leak. Check the humidifier for any leaks or cracks and replace it if necessary.

Frequently Asked Questions:

Q: What should I do if I notice water leaking from my Goodman furnace?

A: Turn off the furnace and shut off the power to the unit. Then, try to identify the source of the leak by following the troubleshooting steps above. If you’re unable to identify the source of the leak, contact a qualified HVAC technician to inspect and repair your furnace.

Q: Can a water leak from my Goodman furnace cause mold growth in my home?

A: Yes, a water leak can create the ideal conditions for mold growth. If you notice mold growth in your home, it’s important to address the issue as soon as possible to prevent further damage to your home and protect your health.

Q: How often should I have my Goodman furnace inspected?

A: It’s recommended that you have your Goodman furnace inspected and serviced by a qualified HVAC technician at least once a year to ensure it’s running safely and efficiently.

Q: Can I repair a water leak in my Goodman furnace myself?

A: While some simple repairs, such as clearing a clogged drain line, can be done by homeowners, it’s generally recommended that you leave furnace repairs to a qualified HVAC technician. Attempting to repair your furnace yourself could result in further damage to your unit or pose a safety risk.


A water leak from your Goodman furnace can be a serious issue, but with the right troubleshooting steps, you can identify and repair the problem. If you’re unable to identify the source of the leak or if you’re uncomfortable making the repair yourself, contact a qualified HVAC technician for assistance. Remember, regular maintenance and inspections can help prevent water leaks and other issues from occurring in the first place.