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Knowing how to reset a Coleman furnace and troubleshoot common issues can save time and prevent unnecessary service calls. The Coleman furnace reset button is a safety feature designed to restart the furnace after ignition faults, fan lockouts, or overheated safety switches. This guide explains where to locate the reset button on typical Coleman models, how to perform a safe reset, and what steps follow if the furnace still won’t operate. It also covers common causes of nuisance resets, when to call a professional, and preventive maintenance to keep a Coleman furnace running reliably.

What Is The Coleman Furnace Reset Button

The Coleman furnace reset button is a dedicated reset switch used to restart the furnace after a fault has tripped one of the safety controls. It is not a power switch; its purpose is to reset the ignition sequence and safety circuits after issues such as flame rollout, flame sensing faults, or overheat conditions. In most models, the reset button is red or yellow, clearly labeled RESET, and located behind the blower access panel or near the inducer housing.

Where To Find The Reset Button On Coleman Furnaces

Reset buttons are typically found in one of a few standard locations. Always power off the furnace before opening any panel.

• Behind the blower access panel, often near the blower motor
• On or near the inducer housing where the combustion gases are vented
• On the electrical control panel with a small RESET button
• On the exterior cabinet near the limit switch area in some older Coleman units

How To Reset The Coleman Furnace

1. Power Off: Switch the furnace off at the dedicated wall switch or circuit breaker. This reduces the risk of electric shock while handling panels.
2. Locate Reset Button: Remove the access panel to expose the control area and find the RESET button, typically red or yellow and clearly labeled.
3. Press And Hold: Press and hold the RESET button for 3–5 seconds to clear the fault and reset the control board.
4. Release And Wait: Release the button and wait about 60 seconds for the ignition sequence to be ready. Do not rush into restarting the unit.
5. Restore Power: Turn the furnace back on at the switch or breaker. The blower may run briefly as the system checks itself.
6. Observe The Startup: If ignition occurs, a steady flame and normal blower operation indicate a successful reset. If the furnace shuts down again, stop and seek further diagnosis.

Safety note: If you smell gas, hear hissing, or suspect a gas leak, leave the area immediately and contact your gas utility or emergency services. Do not attempt another reset.

When To Reset And When To Call A Pro

Resetting is appropriate after a temporary fault or following a power interruption that caused a brief flame-out. Do not reset if the furnace repeatedly trips or if there is a persistent fault indicated by odd smells, unusual noises, or abnormal flame behavior. When in doubt, err on the side of caution and contact a professional.

• Reset if the trip was caused by a temporary condition, such as a brief power outage or a blocked vent that has since been cleared.
• Reset after addressing simple issues you can safely handle, like replacing a furnace filter and cleaning the flame sensor (if comfortable doing so).
• Call a pro if resets happen repeatedly, if you notice a gas odor, flame instability, or high-limit switch trips, or if ignition fails repeatedly after a reset.

Common Problems Triggering Reset And How To Troubleshoot

Many nuisance resets stem from issues that can often be addressed without replacing major components. The following are common causes and basic steps to diagnose them.

• Dirty flame sensor: A dirty sensor can fail to detect flame after ignition, causing a safety lockout. Turn off power, gently wipe the sensor with a soft cloth, and re-test after a reset.
• Clogged air filter or restricted airflow: Poor airflow can cause overheating and safety shutoffs. Replace or clean the air filter, ensure ductwork is clear, and inspect return air paths.
• Venting or exhaust obstructions: Blocked or restricted venting can trigger lockouts. Check outdoor vents, flues, and condensate lines for obstructions and clear them if safe to do so.
• Faulty inducer or ignition components: If the inducer valve or ignition module is failing, the furnace may not ignite reliably. A professional inspection is recommended.
• Gas supply issues: Inconsistent gas pressure or valve problems can prevent ignition. Do not manipulate gas lines yourself; contact a licensed technician.
• Limit switch or control board faults: Malfunctioning safety switches or a failing control board can cause repeated resets. Diagnosis and replacement require professional service.
• Condensate drain problems: A blocked condensate line can trigger safety switches in some models. Ensure drainage is clear and unobstructed.

Preventive Maintenance For Coleman Furnaces

Regular maintenance reduces the likelihood of nuisance resets and extends furnace life. The following practices help keep a Coleman furnace reliable.

• Replace HVAC filters every 1–3 months, depending on use and household conditions.
• Schedule annual professional servicing to inspect burners, ignition, flame sensor, electrical connections, and venting.
• Keep the outdoor area around the furnace clear and ensure vents and exhausts are unobstructed.
• Inspect condensate lines and drains for blockages and ensure proper drainage.
• Test the thermostat compatibility and verify proper call-for-heat signals to the furnace.
• Clean flame sensor surfaces and inspect ignition components during routine service.

Quick Reference: Reset Steps And Indicators