Coleman Furnace Limit Switch Reset: Easy Steps for Homeowners


Coleman furnaces are known for their durability and reliability, providing essential warmth during cold seasons. However, like any furnace, they may occasionally encounter issues, one of which could involve the limit switch. The limit switch is a safety feature designed to shut down the furnace if it overheats, preventing damage or fire hazards. If your Coleman furnace has stopped working and you suspect the limit switch has tripped, resetting it can be a straightforward process. Here’s a guide to help you safely reset the limit switch on your Coleman furnace.

Understanding the Limit Switch

The limit switch in a furnace acts as a safety control that turns off the burner when the furnace becomes too hot. Tripping of the limit switch often indicates an overheating problem, which can be caused by various issues like restricted airflow, a dirty filter, or a malfunctioning blower motor.

Step 1: Ensure Safety First

Safety should always be your first priority. Turn off the power to your furnace to prevent any electrical accidents. This can be done at your main circuit breaker or the furnace’s own power switch.

Step 2: Locate the Limit Switch

Open the furnace’s access panel. In most Coleman furnaces, the limit switch is located inside the front panel, near the heat exchanger. It’s a small device, often with a button or a knob on it.

Step 3: Reset the Limit Switch

To reset the limit switch, press the button or knob. If the switch has tripped, pressing this button should reset it. In some cases, you may feel a slight click when you press the button, indicating the reset is complete.

Step 4: Replace the Access Panel

After resetting the switch, replace the access panel on your furnace. Make sure it is secured properly.

Step 5: Turn the Power Back On

Restore power to the furnace. You can do this by turning on the power switch at the furnace or the main circuit breaker.

Step 6: Test Your Furnace

Once the power is back on, set your thermostat to heat mode and adjust the temperature to initiate a heating cycle. Observe the furnace to see if it starts up and runs properly.

Troubleshooting Tips

  • Check Air Filters: A dirty air filter can cause overheating. Ensure your furnace’s air filter is clean and replace it if necessary.
  • Inspect the Blower Motor: Confirm that the blower motor is functioning correctly. An issue with the blower motor can lead to poor airflow and overheating.
  • Look for Blocked Vents: Ensure all air vents and registers in your home are open and not blocked by furniture or other objects.

When to Call a HVAC Technicians

  • If the limit switch continues to trip after resetting.
  • If you’re unsure about any part of the resetting process.
  • If you notice unusual noises, smells, or if the furnace fails to heat your home efficiently after resetting.

Preventative Maintenance

Regular maintenance is key to avoiding furnace problems. This includes changing the air filters regularly, ensuring proper airflow, and scheduling annual professional inspections.


Resetting the limit switch on your Coleman furnace can be an easy fix for some heating issues. However, if the problem persists or you feel uncomfortable performing these steps, it’s best to seek assistance from a professional. Regular maintenance and prompt attention to issues will help ensure your furnace operates safely and efficiently.

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