Arcoaire furnaces use a reset mechanism to address safety shutoffs, ignition issues, and abnormal furnace operation. Knowing where the reset button is, when to use it, and how to troubleshoot after pressing it can save time and prevent unnecessary service calls. This guide explains how the Arcoaire furnace reset button works, where to find it on common models, and practical steps for safe, effective resets. It also covers common reasons the reset trips, interpreting indicators, and maintenance tips to reduce future resets.

What Is The Arcoaire Furnace Reset Button

The reset button on many Arcoaire furnaces is a safety feature used after a fault condition triggers an automatic lockout. It typically engages after overheating, a flame sensor issue, or a faulty ignition sequence. Pressing the reset button reinitializes the furnace control, allowing an attempt at restart once safety conditions are satisfied. Not all Arcoaire models implement a user-accessible reset button; some require a complete power cycle or professional service. If the button is not present, follow model-specific guidance or contact a technician.

Where To Find The Reset Button On Arcoaire Furnaces

The location of the reset button varies by model and furnace type. Common placements include the blower door panel or the furnace’s control area behind a service access panel. Look for a clearly labeled red or yellow button marked RESET, or a small push button near the control board. In some older or compact models, the reset may be part of a circuit board reset function rather than a dedicated button. If the button isn’t obvious, consult the user manual or the equipment label on the furnace for exact location instructions.

Safety Precautions Before Resetting

Turn off the thermostat and switch the furnace power to OFF at the switch or breaker.
Check for any signs of gas smell or combustion issues before attempting a reset. If gas is detected, evacuate and call the gas emergency line.
Ensure there is proper ventilation and a functioning carbon monoxide detector in the area.
Inspect the air filter and venting for blockages that could cause overheating or poor combustion.
Do not repeatedly reset a furnace that immediately trips again; repeated resets can indicate a latent fault needing professional evaluation.
After resetting, observe the safety sequence carefully. If the burner fails to ignite or shuts down repeatedly, stop and seek a pro.

Step By Step How To Reset An Arcoaire Furnace

Turn the thermostat to OFF and cut power to the furnace at the service switch or electrical panel. Wait 60 seconds to discharge residual power.
Locate the reset button on the furnace control area or panel. If present, press and release the RESET button once. Some models require a firm press and a hold for a few seconds; follow the button’s instruction if printed nearby.
Return power to the furnace by switching the breaker ON or the service switch to ON. Set the thermostat to HEAT, and lower or raise the setpoint to trigger a restart.
Observe the ignition sequence. A healthy restart will light the burners and establish heat within a few moments. If the burner fails to ignite, or the safety limit shuts the furnace off again, do not keep trying; this indicates a fault beyond a simple reset.
If the unit cycles on and off or continues to trip, inspect basic causes: dirty filter, blocked venting, or a flame sensing issue. Address these before attempting another reset.
For models without a dedicated reset button, perform a power cycle by turning off power at the breaker for 60 seconds, then restoring power and restarting through the thermostat.

Common Reasons The Reset Button Trips

Overheating due to restricted airflow or dirty filters, causing a high-limit switch to trip.
Flame sensor or ignition faults where the burner fails to establish a stable flame.
Blocked or restricted venting that prevents proper combustion and ignition safety shutoff.
Faulty ignition components such as the hot surface igniter or electronic ignition circuit.
Gas valve or pressure issues that prevent safe burner ignition or flame stability.
Electrical faults in the control board, wiring, or safety circuits.
Improper air flow from a furnace installed with undersized returns or a mis-sized duct system.

Interpreting Error Codes And Indicators

Many Arcoaire units display fault codes on the control board LED or on the thermostat. Interpreting these codes helps pinpoint the fault before calling a technician. Always refer to model-specific manuals for exact codes. The table below provides common interpretations, but codes can vary by model and control system.

Code/Flash Pattern	Likely Issue	Recommended Action
2 blinks	Flame sensor fault or no flame	Inspect flame sensor for cleanliness; ensure proper ignition; if unresolved, service.
3 blinks	Pressure switch or vent problem	Check venting and condensate trap; clear obstructions; call pro if not resolved.
4 blinks	Ignition or flame rollout issue	Inspect ignition sequence; verify gas supply; if rollout persists, stop and contact a technician.
5 blinks	High limit or safety switch active	Investigate overheating causes; verify air flow and duct integrity; reset after addressing root cause.
6 blinks	Communication fault or control board error	Power cycle; if persists, professional service is required.

Note: Not all Arcoaire models use the same codes or indicators. Always check the model’s user guide for exact meanings and recommended actions. If codes indicate a potentially hazardous condition, stop and seek professional service immediately.

When To Call A Pro

The furnace repeatedly trips after a reset or fails to ignite.
You smell gas or detect a persistent gas odor near the furnace or gas line.
The flame is not stable, or the burner produces yellow, soot-filled flames instead of a crisp blue flame.
There are signs of corrosion, damaged wiring, or water intrusion in the furnace area.
The safety controls or limit switches appear to be releasing operation frequently or fail to reset reliably.
Code indications on the control board or thermostat suggest a fault beyond simple reset steps.

Maintenance And Prevention To Avoid Future Resets

Replace or clean the air filter every 1–3 months, depending on usage and indoor air quality.
Schedule annual professional maintenance to check the ignition, heat exchanger integrity, gas connections, and venting.
Keep the furnace area clear of debris, dust, and stored items to maintain proper airflow.
Test and replace the carbon monoxide detector batteries regularly; ensure detectors are functioning properly.
Inspect and clear condensate lines and traps to prevent water-related shutdowns or corrosion.
Confirm that ductwork is correctly sized and free of leaks to maintain consistent airflow.

Additional Tips For Homeowners

If the reset button is difficult to access or appears damaged, do not force it. Avoid bypassing safety features or using makeshift workarounds. Keep the manual or model sticker handy, and maintain a quick-reference sheet with model numbers, serial numbers, and service history for future technician visits. When in doubt, prioritize safety and contact a qualified HVAC technician with experience in Arcoaire systems to diagnose and service the unit.