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How to Reset A Lennox Furnace

Lennox is one of the top brands when it comes to HVAC systems. Even when purchasing top brands, when technology is involved, there are bound to be moments when you are forced to troubleshoot. If you have tried everything in the book, from looking at your thermostat to changing your air filter, it is time to try resetting your system. Here are some instructions on how to properly reset your furnace.

1. First, you should find your electrical panel and switch off the power supply. This step is important for your safety. Failing to complete this step could result in an electrical injury. Most breaker systems are labeled, flip the breaker switch labeled furnace or heating.

2. Next, take a look at the control panel on your furnace. This will be located on the bottom of your system if you have a downflow furnace, and on the top of your system if you have an up flow furnace. Once you find it, lift the part up and away from your system. You can set this to the side for now.

3. Now it is time to examine your furnace. Look for a button or switch located to the right of the ignition box. This is also known as the “Lennox limit switch reset.” Press on the release limit to reset your furnace.

4. Lastly, make sure to place the control panel back onto your system. Flip your breaker labeled furnace or heating back on. Once you have these steps completed, you should have fully reset your furnace.

Hopefully, these tips help you troubleshoot any current or upcoming problems with your system. For professional assistance, visit or give us a call at 515-965-7272. One of our professional technicians would be more than happy to assist!

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