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Lennox furnace reset

How to Reset a Lennox Furnace in 4 Easy Steps

Every homeowner knows that a well-maintained furnace is akin to the heart of a warm and cozy home, especially during those chilly winter nights. However, like any sophisticated piece of…

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Every homeowner knows that a well-maintained furnace is akin to the heart of a warm and cozy home, especially during those chilly winter nights. However, like any sophisticated piece of equipment, there are moments when even the best furnaces hiccup, and suddenly, it feels like the warmth has abandoned you. 

That’s where understanding the nuances of your furnace comes into play. Particularly, if you own a Lennox furnace, knowing how to execute a simple Lennox furnace reset can save you a chilly night and potentially hefty technician fees. 

This quick reset can be your first step in troubleshooting some common furnace glitches. But when exactly might you need to use the Lennox furnace reset method? Let’s dive in!

Step 1: Ensure Safety First

A close up image of one of our technician showing how to switch off power at the furnace's main switch during Lennox furnace reset

Before diving headfirst into the Lennox furnace reset process, let’s put on our safety hats. After all, while the process might sound straightforward, we’re still dealing with electrical equipment, and safety should never be compromised.

  • Turn Off the Power: Always start by turning off the power to your Lennox furnace. This is usually done at the main circuit breaker or the furnace switch, typically located on or near the unit. By doing so, you’re ensuring that there’s no risk of accidental electrical shocks during the reset.
  • Let It Cool: If your furnace was recently running or trying its best to, give it some time to cool down. Furnaces can get pretty hot, and the last thing you’d want is an accidental burn while trying to reset it.
  • Suit Up With Gloves: While the Lennox furnace reset process isn’t too hands-on, it’s a smart move to wear protective gloves. This not only guards against potential burns but also ensures you don’t accidentally hurt your fingers or come in direct contact with any electrical components.

Remember, safety isn’t just about following steps—it’s an attitude. By ensuring you’re protected and the furnace is safe to touch, you’re setting yourself up for a smooth and incident-free Lennox furnace reset.

Step 2: Locate the Reset Button

So, you’ve taken all the necessary safety precautions and you’re ready to jump into the main event—the Lennox furnace reset. But where to start? Well, just like every epic quest has a beginning, our journey starts with locating the elusive reset button.

On most Lennox furnaces, the reset button is typically a small, red button situated on the furnace’s exterior. However, it’s essential to know that the exact location can vary based on the model and year of your furnace. 

If you’re finding it challenging to spot, it might be tucked away behind a panel. In such cases, gently remove the furnace’s front or side panel, and voila! Your reset button should be in clear sight.

Having a flashlight or a good light source can be a game-changer in dimly lit areas. Moreover, if your Lennox furnace came with a user manual, it can provide a handy map to the reset button’s exact location.

Get user manuals here.

Once you’ve found this magical button, you’re one step closer to completing your Lennox furnace reset and reclaiming the warmth of your home!

Step 3: Press the Reset Button

A close up image of a Lennox furnace reset to help readers understand better the location of the button

Having ensured safety, your next task is pressing the reset button on your Lennox furnace. Here’s how to go about it:

  • The Right Touch: Pressing the reset button is straightforward. Use a firm yet gentle push without applying too much pressure. It’s about making sure the button is adequately engaged, not how hard you can press.
  • Hold and Wait: Different Lennox furnace models have varied reset procedures. While a quick press might work for some, others could require holding the button for about 5 seconds. Pay attention to the button’s feedback. If it quickly pops back up, a brief press is usually sufficient. If it offers some resistance, maintain pressure for the required duration.

After this step, you’re close to completing the Lennox furnace reset. Ensure you follow through with the subsequent steps to get your furnace operating optimally. Patience is key, and you’re doing splendidly!

Step 4: Restore Power and Test

With the reset button adventure behind you, it’s time to breathe life back into your Lennox furnace and see your hard work pay off.

  • Powering Up: Head back to where you initially turned off the power, whether it was the main circuit breaker or the furnace switch. Flip it back on, ensuring you’re standing clear of the furnace unit itself. You might hear some initial noises—a hum, a click, or even a soft whir. That’s your furnace awakening from its brief slumber.
  • The Waiting Game: After restoring power, give your furnace a moment. It might take a minute or two for the furnace to go through its startup routine. Think of it like your morning coffee routine; we all need that little buffer time to get going.
  • Observe and Listen: As the furnace begins its operations, be observant. Listen for any unusual sounds or signs of distress. Ensure that warm air is flowing from the vents, indicating that your Lennox furnace reset was successful.

If all goes well, congratulations! You’ve just navigated through the Lennox furnace reset process like a pro. However, if the furnace isn’t operating as expected, it might be time for some expert intervention. But that’s a topic for another day. For now, revel in your accomplishment and the warm embrace of your home.

Additional Maintenance Tips

Maintaining a furnace, especially one as reputable as a Lennox, is more than just knowing how to reset it. To keep your furnace running efficiently and extend its lifespan, consider these extra tips:

  • Regular Maintenance: Schedule yearly check-ups with a professional technician. They can spot potential issues and ensure your furnace runs efficiently.
  • Clean or Replace Filters: A dirty filter can reduce efficiency and strain the furnace. Check and replace or clean filters every 1-3 months, depending on use.
  • Keep Vents Unblocked: Ensure all vents, both intake and output, are free from obstructions. This promotes better airflow and efficiency.
  • Listen for Strange Noises: Odd sounds can be early warning signs of potential issues. If you notice anything unusual, consult a technician.
  • Educate Yourself: The more you know about your Lennox furnace, the better. Familiarize yourself with the user manual and stay updated on any recalls or updates from the manufacturer.

Remember, a furnace is an investment in your home’s comfort. By taking these extra steps, you ensure its longevity and efficiency for years to come.

Watch here Lennox furnace reset:


Safety should always take center stage, especially when working with electrical appliances like your Lennox furnace. While the reset process is designed to be user-friendly, not every issue can be resolved with a simple button press. 

If your furnace still refuses to cooperate after a reset, it’s a clear sign to consult a professional. Technicians bring expertise that ensures both the functionality and safety of your furnace. Here’s to taking proactive steps in home maintenance, but also recognizing when it’s time to call in the experts!

READ: How to Reset Lennox AC Unit: A Comprehensive Guide

I'm an HVAC enthusiast and a passionate writer dedicated to sharing valuable insights and practical tips about heating, cooling, ventilation, and air conditioning systems.

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Hi there, I'm Robert Brooks

Hi there, I'm Robert Brooks

I’m so glad you are here! Welcome to my website, where I’ll share easiest HVAC troubleshooting tips, buyers guides, and everything about HVAC cooling and heating system. Learn more about me.

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