How To Reset the Limit Switch on a Furnace

Experiencing issues with your furnace can be a daunting challenge, especially when it involves the intricate process of resetting the limit switch. At Watson Heating & Air, we understand the complexities and are here to guide you through the furnace reset process.

Whether it's a modern or an older furnace, understanding how to reset the limit switch on a furnace is crucial for maintaining a comfortable and safe home environment. In this guide, Watson Heating & Air will explain how to reset the limit switch on a furnace. When you need furnace repair in Lexington, KY, to address a broken limit switch or any other issue, give us a call.

How To Reset Your Furnace's Limit Switch

Resetting a furnace, especially models less than 30 years old, typically involves turning the power off and then back on. You may need to turn off the switch mounted on or near the furnace, or you may need to turn off the circuit breaker.

After waiting for about 10 seconds, turn the power back on and check if the furnace regains power. For older furnaces, the process may include:

• Checking the pilot light
• Lowering the thermostat
• Relighting the pilot light
• Setting the thermostat to the desired temperature

To avoid electrical hazards, it's important to ensure that the furnace's power source is completely shut off before attempting any reset.

This reset process can often resolve minor issues, restoring normal function to your heating system. However, if the furnace still doesn't operate correctly after these steps, it may indicate a more serious problem requiring professional attention.

Check Your Furnace’s Pilot Light

One of the first things to do when learning how to reset the limit switch on a furnace is to check the pilot light.

A crucial step in resetting older furnaces is the pilot light check. If the pilot light is off, it indicates a need for a reset. After ensuring the pilot light is off, adjust the thermostat to the lowest setting as a safety precaution. This prevents the risk of getting blasted with hot air if the furnace turns on unexpectedly during the reset process.

Additionally, this step helps in identifying if the issue is with the thermostat or the furnace itself. Lowering the thermostat also aids in the safe handling of the furnace components during the reset. It's a simple yet effective measure to ensure your safety and the proper functioning of the furnace.

Inspect the Heating Element and Replace the Limit Switch 

Common furnace problems can range from uneven heating to no air coming out of the vents. These issues might indicate a need for a heating element inspection or even a limit switch replacement. A continuously running blower, for instance, can signal a faulty limit switch, necessitating professional intervention.

Additionally, unusual noises such as rattling or squeaking from the furnace could point towards mechanical issues or a clogged burner. Regular inspections and timely repairs can prevent these problems from escalating into major malfunctions. It's important to address these signs promptly to ensure your furnace operates efficiently and safely.

Blower Motor Function and Maintenance Tips

Ensuring the proper function of the blower motor is integral to the overall health of your furnace. Regular maintenance, including cleaning or replacing filters and checking for mechanical HVAC issues, is essential. Maintaining your furnace not only ensures efficient heating but also prolongs its lifespan and upholds warranty requirements.

Key maintenance steps include:

• Regular Filter Replacement: Change or clean the furnace's air filters every three to six months to ensure optimal airflow and efficiency.
• Blower Motor Inspection: Check the blower motor regularly for signs of wear or damage and lubricate it as needed.
• Ductwork Cleaning: Ensure the ducts are clean to improve air quality and system efficiency.
• Thermostat Calibration: Regularly check and calibrate the thermostat to ensure accurate temperature control.
• Annual Professional Check-ups: Schedule yearly inspections with a qualified technician to identify and fix potential issues.
• Checking for Leaks: Regularly inspect for gas or air leaks in and around the furnace.
• Ensuring Proper Ventilation: Make sure the furnace area is well-ventilated to prevent overheating and improve safety.

Trust Watson Heating & Air for Your Furnace Needs

Learning how to reset the limit switch on a furnace can be straightforward, but it requires careful attention to detail. If your furnace won’t stay lit or you encounter other issues, Watson Heating & Air is here to help.

Our team can handle all your furnace needs, ensuring your home remains warm and safe. For assistance with your furnace, call us at 859-448-1054. Whether you need a thermostat adjustment or furnace repair, you can trust us.