How To Reset A Limit Switch On A Furnace

If your heating system isn’t meeting your needs, there are multiple causes of a heater not working. However, if it shuts off unexpectedly or isn’t providing consistent heat, one possible issue could be the furnace limit switch. Honeycomb Heating & Cooling is here to help you maintain safe HVAC operation with our San Antonio furnace repair services.

This critical switch is designed to prevent overheating by shutting down the heater if the temperature inside the system exceeds safe levels. In this guide, we’ll walk you through how to perform a reset and identify the signs of a faulty switch.

What Is A Furnace Limit Switch?

The limit switch is a safety mechanism that monitors the temperature inside your unit’s heat exchanger. It will shut the system down if it detects temperatures above a safe threshold. This process protects the system from damage but also keeps your home safe from potential hazards, like fires or carbon monoxide leaks.

Why Does A Limit Switch Need To Be Reset?

When your furnace overheats, the limit switch will trigger and shut the system off to protect it. If short-cycling happens repeatedly, the switch may need to be reset to get your system running again.

However, it’s important to note that frequent shutdowns could indicate a deeper issue with your system. It’s crucial to know when to contact the experts at Honeycomb for safe repair services.

How To Perform A Furnace Limit Switch Reset

While resetting the switch can troubleshoot minor issues, it’s important to note that HVAC repairs are safest when performed by a licensed professional, such as those at Honeycomb. We recommend contacting our team to perform the reset process.

1. Turn Off The System’s Power

Before working on any heater components, always turn off the power to the system to avoid electrical hazards. The power can be turned off by flipping the switch located near the system and shutting off the breaker to the unit.

2. Locate The Switch

The limit switch is usually located in the control panel. It looks like a small rectangular box with wires connected to it. The system’s user manual can outline the components and provide information on how to locate it.

3. Press The Reset Button

Most limit switches come with a manual reset button. Once the switch has been located, press the reset button to restore its functionality.

4. Restore Power And Test The Furnace

After resetting the component, restore power to the heating unit and test it. If the unit operates normally without shutting down, the issue may have been resolved.

However, if it continues to trip the switch, it could indicate a deep-rooted issue that requires professional heating repair.

Signs Of A Bad Limit Switch

Sometimes, resetting this component isn’t enough to resolve heater issues. Knowing the signs of a faulty switch can help you identify when it’s time to have our experts replace it. Here are a few common indicators:

• Frequent shutdowns — If your system shuts down repeatedly, even after a reset, this could indicate that the part is failing.
• Inconsistent heating — A faulty switch might cause the unit to turn off prematurely. This issue can result in inconsistent temperatures throughout your home.
• Blower motor runs continuously — If the blower motor keeps running even after the unit has shut down, it can indicate that the component isn’t functioning correctly.
• Incorrect thermostat readings — If your thermostat is calling for heat, but the unit isn’t turning on, the switch might be malfunctioning.

If you notice these troubles, it’s important to call our professional HVAC technicians to inspect and replace the switch if necessary.

Bee Comfortable: Contact Honeycomb Heating & Cooling For Furnace Repair

Resetting the limit switch can be a simple solution to a shutdown issue, but if problems persist, it could be a sign of a larger problem.

If you’re in the San Antonio area and need assistance with your San Antonio heater, contact Honeycomb Heating & Cooling. Our experts will diagnose the problem and restore your system back to optimal operation. Reach out today to keep your home comfortable!