The Comfortmaker furnace reset button is a safety feature designed to restore operation after an overheating event or ignition fault. Understanding when and how to use this reset properly can help homeowners quickly regain heat while avoiding unnecessary damage. This guide explains what the reset button does, where to find it, and step-by-step instructions for a safe reset. It also covers common causes for trips, safety precautions, and maintenance tips to reduce future resets.
Understanding The Reset Button On Comfortmaker Furnaces
Many Comfortmaker furnaces include a high‑limit or flame‑sensing safety switch with a reset button. The reset button is typically a small red or orange push‑button located behind an access panel in the blower compartment. Pressing it resets the safety control after it has tripped due to overheating or a flame failure. Some newer models may use electronic controls that reset automatically or require a power cycle rather than a manual push button. Because configurations vary by model, consulting the owner’s manual or a professional is advised if the button isn’t obvious.
When The Reset Button Should Be Used
The reset button should be used only after the furnace has cooled and only when the system has shut down due to a controllable safety trip. Typical scenarios include an overheated furnace, a flame sensor issue, or an ignition lockout. Repeatedly pressing the button without addressing the underlying cause can cause further damage or obscure a serious fault. If the furnace won’t stay lit after a reset or trips again soon after restart, discontinue attempts and contact a licensed HVAC technician.
Step-By-Step Reset Procedure
Follow these steps carefully to perform a safe reset on a Comfortmaker furnace. Each step should be completed in sequence to minimize risk and avoid further trips.
- Turn Off The Thermostat: Set the thermostat to OFF to prevent the furnace from attempting another start during the reset process.
- Power Down The Furnace: Switch off the furnace at the dedicated circuit breaker or at the furnace’s power switch. This ensures all electrical components are fully deenergized before you open the panel.
- Open The Access Panel: Remove the panel to access the blower compartment and ignition area. Do not touch wiring or live components unnecessarily.
- Locate The Reset Button: Find the reset button, typically labeled RESET and clearly visible near the safety switch. If the button has not tripped or is not present, skip this step and proceed with professional guidance.
- Press The Reset Button: Press and release the button once. You may hear a click or feel a slight movement indicating the switch has reset. If the button requires a firm press for several seconds, hold it until you hear or feel a response, then release.
- Close The Panel: Reinstall the access panel and secure it. Ensure all screws are tight and vents are clear.
- Restore Power And Test: Turn the furnace power back on at the breaker or switch. Return the thermostat to a comfortable heat setting and observe the furnace as it begins a normal startup cycle.
- Monitor For Safe Restart: Allow the furnace to reach steady operation. If heat is produced without repeated shutdown, the reset was successful. If the system trips again, stop and contact a professional promptly.
Common Reasons The Reset Button Trips
Understanding why the reset button trips can help prevent future outages and guide troubleshooting. Typical causes include the following:
- Restricted Airflow: A dirty air filter, blocked return or supply vents, or closed dampers can cause overheating and trigger the high‑limit switch.
- Dirty Or Faulty Flame Sensor: A contaminated flame sensor can fail to read a stable flame, causing a safety lockout and reset need.
: Malfunctioning ignition components or delayed ignition can trip the system as a protective measure. - Venting Or Combustion Issues: Blocked chimneys, exhaust restrictions, or improper venting can lead to improper combustion and safety trips.
- Gas Supply Irregularities: Inconsistent gas pressure or a closed/partially closed gas valve can cause ignition faults and reset triggers.
Other contributing factors include excessive indoor humidity, dirty condensate lines, or wiring faults that cause intermittent signals to safety controls. If any of these are suspected, ongoing issues should be evaluated by a professional.
Safety Precautions And When To Call A Pro
Safety is paramount when dealing with a furnace reset. Homeowners should observe these precautions:
- Gas Odor Or Leak: If you smell gas or hear hissing sounds, evacuate the area and contact the gas company or emergency services immediately. Do not restart the furnace.
- Electrical Safety: Always turn off power at the breaker before opening the furnace. Do not bypass safety switches or defeat warning devices.
- Frequency Of Trips: If the reset button trips repeatedly, do not keep resetting. This indicates an underlying fault that requires professional diagnosis and repair.
- Professional Evaluation: A licensed HVAC tech can diagnose issues such as flame sensor cleaning, burner or ignition problems, airflow blockages, or control board faults.
- Model-Specific Guidance: Since Comfortmaker models vary, consult the owner’s manual for location, operation, and reset procedures unique to the unit.
Maintenance To Minimize Future Resets
Preventive maintenance helps reduce the need for resets and improves overall furnace reliability. Consider these best practices:
- Regular Air Filter Changes: Replace disposable filters every 1–3 months or as recommended by the manufacturer to maintain proper airflow.
- Annual Professional Tune-Ups: A yearly inspection by a qualified technician can catch ignition, sensor, or airflow issues before they trigger a reset.
- Keep Vents Clear: Ensure supply and return vents are unobstructed by furniture or drapes to maintain consistent airflow.
- Inspect Condensate Drain: Clear any clogs that could trigger overheating or drift into the electrical components.
- Thermostat And Wiring Checks: Verify that thermostat wiring is secure and that settings match system capabilities to avoid miscommunication with the furnace.
- Clear Surroundings: Maintain adequate clearance around the furnace for proper combustion and ventilation, following manufacturer guidelines.
Frequently Asked Questions
Can I reset a Comfortmaker furnace multiple times in one day? Repeated resets suggest an underlying fault and should be evaluated by a professional to prevent damage or unsafe operation.
Is the reset button always behind the access panel? Most models place the reset button inside the blower compartment behind the service panel, but locations can vary. If uncertain, consult the manual or a pro.
What if the furnace won’t restart after a reset? If the unit fails to restart or continues tripping after a reset, stop attempting to reset and contact a licensed HVAC technician for diagnosis and repair.