Bryant Furnace Limit Switch Reset: A Homeowner’s Guide

furnace reset

Bryant furnaces are a staple in many homes, providing reliable and efficient heating. However, like any furnace, they can experience issues that may require troubleshooting. One common problem is a tripped limit switch. The furnace limit switch is a safety feature that shuts the furnace off if it overheats. Resetting this switch is a relatively simple process, but understanding why it tripped in the first place is crucial. Here’s a step-by-step guide for homeowners on how to reset the limit switch on a Bryant furnace and some tips for troubleshooting.

Understanding the Limit Switch

The limit switch in your Bryant furnace prevents the unit from overheating. When the furnace gets too hot, the switch will trip, shutting down the furnace to prevent damage or a potential fire hazard. This can happen due to various reasons, such as restricted airflow, a dirty filter, or a malfunction within the furnace.

Step 1: Ensure Safety First

Before attempting any kind of reset or troubleshooting, safety should be your top priority. Turn off the power to your furnace. This can typically be done at your home’s main circuit breaker or at the furnace’s on/off switch.

Step 2: Locate the Limit Switch

You will usually find the limit switch inside the furnace’s front panel. Most Bryant furnaces have an access panel that can be opened or removed without tools. Inside, the limit switch is often near the heat exchanger and has a small button or knob on it.

Step 3: Reset the Limit Switch

Once you locate the limit switch, press the reset button. If the switch has tripped due to overheating, this should reset it. However, if the switch trips again soon after resetting, this indicates a more serious issue that needs attention.

Step 4: Replace the Access Panel

After resetting the switch, replace the furnace’s access panel.

Step 5: Turn the Power Back On

Restore power to your furnace and monitor it. The furnace should start operating normally. If it doesn’t, or if it trips again, further troubleshooting is required.

Troubleshooting Tips

  • Check Air Filters: A dirty or clogged air filter can restrict airflow, causing the furnace to overheat. Replace or clean your furnace’s air filter.
  • Inspect Vents and Registers: Ensure all vents and registers in your home are open and unobstructed to allow proper airflow.
  • Look for Obstructions: Check around the furnace for any items or debris that could block air intake or exhaust.
  • Check the Blower Motor: Ensure that the blower motor is functioning correctly. A malfunctioning blower motor can lead to overheating.

When to Call a Professional

  • If the limit switch trips repeatedly after resetting.
  • If you are unsure about any steps in the resetting process.
  • If you detect any unusual noises, smells, or if the furnace does not heat properly after resetting.

Preventative Maintenance

Regular maintenance is key to the efficient operation of your furnace. This includes changing filters regularly, scheduling annual professional inspections, and ensuring proper airflow around the furnace.


Resetting the limit switch on your Bryant furnace can resolve some heating issues, but it’s important to understand why it tripped in the first place. If the problem persists, or if you’re uncomfortable performing these steps, it’s best to contact a professional. Regular maintenance and prompt attention to issues will keep your furnace running safely and efficiently.

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