How to Find and Use the Lennox Furnace Reset Button: Comprehensive Guide for Homeowners

If your Lennox furnace suddenly stops working, knowing how to locate and use the Lennox furnace reset button can save time, money, and discomfort—especially during colder months. This guide clearly explains where to find the reset button on most Lennox furnaces, how and when to use it safely, and what steps to take if your furnace still won’t operate normally. Homeowners will also learn about troubleshooting common furnace problems, ensuring continued safety and comfort.

Quick Overview: Lennox Furnace Reset Button

Aspect	Details
Purpose	Restarts furnace after safety shutdown or error
Common Location	Blower compartment, near blower motor, or control panel
Appearance	Red or yellow button, round, labeled “RESET”
When To Use	After troubleshooting issues like overheating, flame-out, or power surges
Precautions	Wait 30 minutes before resetting; do not press repeatedly

What Is The Lennox Furnace Reset Button?

The Lennox furnace reset button acts as a safety feature that automatically shuts off the furnace when certain faults or dangers are detected. Pressing this button can restore normal operation after resolving the underlying problem. This prevents potential hazards such as overheating or gas leaks, keeping your home and family safe.

Where To Find The Reset Button On Lennox Furnaces

Most Lennox furnaces have a reset button located inside the main blower compartment. It is usually a small, colored (red or yellow) round button placed on or near the blower motor assembly. Occasionally, you might find the button mounted directly on the furnace control board.

Common Reset Button Locations:

• On the side or top of the blower motor housing
• Behind the lower front furnace panel
• On the main control panel, near electrical wiring

To access the button, you must first turn off the furnace’s power supply and remove the front panel. Some newer Lennox models may require the use of a flashlight or manual for precise button location.

When Should You Use The Lennox Reset Button?

The reset button is designed for specific safety events. Use it only after diagnosing and addressing the cause of the shutdown. Pressing the reset button repeatedly without resolving the underlying issue can damage your furnace.

Appropriate Scenarios For Using The Reset Button:

• The furnace shuts off and won’t restart after a brief outage
• There’s evidence of overheating or a recent power surge
• You’ve fixed a blocked air filter or other clear furnace issue

Do not use the reset button if you suspect a gas leak or persistent electrical problems—contact a licensed technician immediately for safety reasons.

Step-By-Step: How To Safely Reset Your Lennox Furnace

Properly resetting your Lennox furnace involves several key safety steps to prevent further issues or injuries. Follow this guide for a safe and effective reset process:

1. Turn Off Power: Switch the furnace off with the wall switch or at the circuit breaker to ensure there’s no electrical flow.
2. Wait At Least 30 Minutes: This prevents accidental overheating or electrical arcing during reset.
3. Remove The Front Panel: Use a screwdriver or release the latches as needed. Place the front panel aside.
4. Locate The Reset Button: Look for a round, colored button on or near the blower motor. It may be marked “RESET.”
5. Press The Reset Button: Firmly press and release it once. Do not press repeatedly—this could signal persistent trouble.
6. Replace The Panel: Reattach the furnace front cover securely.
7. Restore Power: Switch the furnace back on at the breaker or wall switch.
8. Monitor The Furnace: Listen and look for normal operation. If the furnace does not start or resets again, reassess for deeper issues.

Why Do Lennox Furnaces Trip The Reset Button?

The reset button activates for a range of reasons. Understanding the most common triggers helps address problems proactively, reducing the chances of repeated shutdowns.

Common Causes For Furnace Reset:

• Overheating: Restricted airflow from dirty filters, closed vents, or blocked ducts
• Ignition Failure: Problems with the igniter, thermocouple, or flame sensor
• Power Surges: Electrical faults or recent storms
• Motor Malfunction: Worn bearings, overheating, or old blower motors
• Fuel Supply Issues: Interrupted gas supply, empty propane tank (for gas furnaces)

Repeated trips mean it’s time to contact a professional for inspection and repair.

Reset Button Troubleshooting: What To Check Before Pressing Reset

Before pressing the reset button, homeowners should inspect basic furnace elements to prevent recurring problems or safety concerns.

Essential Furnace Checks:

• Check air filters and replace them if dirty to ensure good airflow
• Look for blocked vents or ductwork obstructions
• Inspect the thermostat for proper settings and fresh batteries
• Confirm the pilot light or electronic igniter is operating correctly
• Ensure your home’s power supply is stable and functional
• Listen for unusual noises indicating motor or fan problems

Addressing these basic checks prevents further issues and can often resolve simple furnace malfunctions without further intervention.

What To Do If The Reset Button Does Not Work

If the furnace refuses to start after pressing the reset button, additional action is required. This often means an unresolved electrical or mechanical failure exists.

Recommended Next Steps:

• Check the circuit breaker and fuses for blown connections
• Inspect for error codes on the furnace control board display, if available
• Listen for persistent clicking or humming (may indicate igniter or motor issues)
• Contact a certified Lennox technician for diagnostics

Do not repeatedly press the reset button, as this may cause further damage to furnace components.

Safety Precautions When Using A Lennox Furnace Reset Button

Prioritize safety when working with any furnace system. Incorrect resets and troubleshooting attempts can result in injury or property damage. Always:

• Shut off power before accessing internal furnace components
• Wait for the system to cool if you suspect overheating
• Never press the reset button if you smell gas or see exposed wires—evacuate and call emergency services
• Consult the user manual for model-specific instructions

Use professional help when unsure, especially with electrical or gas systems.

Tips For Preventing Future Lennox Furnace Resets And Major Breakdowns

Regular care can decrease the frequency of resets and reduce emergency repairs. Proactive maintenance leads to longer furnace life and improved safety.

• Change or clean the air filter every 1–3 months, depending on usage
• Keep vents and registers open and unobstructed throughout the home
• Schedule annual furnace inspections with a licensed HVAC professional
• Test your thermostat regularly and ensure it is correctly calibrated
• Monitor for strange sounds or odors from the furnace

Consistent care helps you avoid emergency heating disruptions when you need your furnace most.

Lennox Furnace Error Codes Related To The Reset Button

Some Lennox furnaces display diagnostic error codes that provide insights into why the system has shut down or why the reset button may need to be used.

Error Code	Description	Recommended Action
LED Slowly Flashing	System operating normally	No action needed
LED Rapid Blink	Ignition lockout, failure to light	Reset button may restore function, check for gas supply issues
LED Steady On	Main limit open	Check air filters, reset after cooling
LED Off	No power to board	Check circuit breaker, reset as needed

Refer to your furnace’s user manual for detailed guidance on other error codes and solutions.

Frequently Asked Questions About The Lennox Furnace Reset Button

• Is it safe to use the reset button multiple times? Only use the reset button once. Multiple resets may worsen damage and signal unresolved issues.
• What if my Lennox furnace reset button is missing? Some newer models use digital controls or internal diagnostic resets. Check the manual or consult a technician.
• How long do I wait before resetting the furnace? Wait at least 30 minutes after shutdown or tripped safety before pressing the reset button.

When To Call A Lennox Furnace Professional

If the furnace continues to trip the reset button, produces persistent odors, or will not start after a proper reset, or if you lack DIY experience, call a certified Lennox technician. Professionals can safely diagnose internal wiring, sensor, or gas-related failures much more quickly and efficiently than most homeowners.

Summary Table: Key Facts About Lennox Furnace Reset Button

What	Description
Button Appearance	Small, colored (usually red or yellow), labeled “RESET”
Usual Location	Inside blower compartment, near motor or control board
Reset Timeout	Wait at least 30 minutes after a shutdown
Most Common Triggers	Overheating, power surges, airflow blockages, ignition failure
Basic Precautions	Turn off power, check for gas leaks, address repairs before reset

Further Resources For Lennox Furnace Owners

• Lennox Owner’s Manuals And Technical Documents
• Lennox Furnace Troubleshooting FAQ
• Find A Lennox Certified Dealer Or Technician

By understanding how to use and troubleshoot the Lennox furnace reset button, American homeowners can ensure warm, safe, and efficient home heating—even when trouble arises.