A Heil furnace reset button is a safety feature used to clear ignition lockouts and restart the furnace after a fault. Homeowners may encounter a no-heat condition caused by a dirty flame sensor, blocked venting, or a faulty inducer. This guide explains where to locate the reset button on Heil models, how to reset safely, common causes of lockouts, and practical maintenance tips to reduce future resets. Always prioritize safety: if you smell gas, if the unit won’t reset, or if it runs abnormally, contact a licensed HVAC technician.
What Is The Heil Furnace Reset Button?
The Heil furnace reset button is a safety control that clears a temporary fault condition (lockout) and reinitializes the ignition sequence after the control board detects a fault. It is not a thermostat setting; it specifically addresses ignition or safety faults. Pressing the reset button reengages the safety circuit once the underlying issue is addressed. If resets occur repeatedly or ignition fails persist, professional service is advised to diagnose and repair the root cause.
Where To Find The Reset Button On A Heil Furnace
The location of the Heil furnace reset button varies by model, but it is commonly found inside the furnace cabinet behind the service panel, near the inducer housing, or on the control board area. Some models use a reset switch rather than a dedicated button, while others may require a brief power cycle on the blower or control board to reset. Before touching any components, power down the unit at the disconnect switch and the main breaker, and never operate the unit with a compromised panel. If a manual or schematic for the exact model is available, consult it for the precise location.
Step-By-Step Guide To Reset
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Turn off power to the furnace at the service switch and the circuit breaker. If you smell gas or hear hissing, evacuate and contact the gas utility immediately.
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Shut off the gas supply to the furnace if you suspect a gas issue, and ensure all flames are extinguished before proceeding.
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Open the access panel to locate the reset button. Look for a red or yellow button labeled “Reset,” “Restart,” or a similar indicator. If no reset button is visible, a model-specific reset method may be required; refer to the manual.
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Press and hold the reset button for about 5–10 seconds, then release. Some models require a firm press and a brief hold; follow the model’s guidelines if provided.
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Restore power at the disconnect switch and circuit breaker. Return the gas supply if it was shut off and re-enable the thermostat.
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Set the thermostat to a heat call and observe the ignition sequence. If the burners light and the furnace runs normally, monitor for steady flame and proper blower operation. If the system fails to ignite again or shuts down after a short run, or if the red/amber error code reappears, stop operating the unit and contact a technician.
Common Issues That Trigger A Reset
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Dirty flame sensor: A dirty flame sensor can prevent ignition by signaling “no flame.” Cleaning the sensor can restore proper operation, but it should be done carefully to avoid damaging the sensor.
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Blocked or restricted venting: Obstructed exhaust or intake pipes cause backpressure that prevents safe ignition. Inspect for debris, birds, or snow and clear as needed.
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Clogged burners or dirty burners: Debris buildup can impede flame stability. A professional cleaning is often required.
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Inducer or pressure switch fault: A faulty inducer or a misreading pressure switch can trigger a lockout even if the burners ignite briefly.
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Gas supply or valve issue: Inadequate gas pressure or a partially closed valve can cause ignition problems, leading to a reset.
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Electrical wiring or control board faults: Loose connections, damaged wires, or a failing control board can cause intermittent resets.
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Thermostat communication: A thermostat that sends erratic signals can mislead the furnace into a lockout).
Safety Considerations And When To Call A Pro
Safety is paramount when dealing with gas furnaces. If there is a gas smell, evacuate the area and contact the gas utility or emergency services. Install and test carbon monoxide detectors on every living level and near sleeping areas. If a Heil furnace repeatedly enters lockout after a reset, or if ignition remains erratic, a licensed HVAC technician should diagnose and repair the root cause. Do not bypass safety features or repeatedly reset a unit without addressing the underlying issue.
Maintenance Tips To Reduce Reset Events
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Schedule annual professional inspections: A yearly tune-up helps identify developing issues before they cause lockouts, including burner cleaning, flame sensor care, and vent inspection.
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Replace air filters regularly: A dirty filter causes restricted airflow, which can contribute to overheating and safety shutoffs.
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Keep return air and vents clear: Ensure unobstructed airflow to and from the furnace to prevent overheating and lockouts.
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Inspect venting and condensate drains: Clear any blockages that could cause improper venting or water backing up into the furnace.
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Clean flame sensor and burners: If advised by a technician, gently clean the flame sensor and burners with non-abrasive materials to restore proper ignition.
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Check thermostat and wiring: Ensure the thermostat communicates properly with the furnace and that wiring connections are secure.
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Monitor for unusual noises or yellow flames: Yellow or flickering flames, rattling, or grinding sounds warrant a professional evaluation.