Armstrong air furnaces use a reset button to recover from ignition faults, power interruptions, or safety shutoffs. This guide explains what the reset button does, where to find it on Armstrong units, and how to reset safely. It also covers common scenarios, troubleshooting tips, and when to call a professional. By understanding the reset process, homeowners can determine whether a fault is minor or requires service, helping avoid unnecessary technician visits and ensuring continued comfort in colder months.
What The Reset Button Does On Armstrong Air Furnaces
The reset button initiates a fresh ignition sequence after a fault or safety shutoff. It is intended to clear minor lockouts and allow the furnace to attempt ignition again, not to fix the root cause of a failure. For Armstrong units, the reset button is commonly found on the control board or inside the blower access panel, often colored red or yellow and labeled Reset. After pressing, the system may automatically relight if the gas supply and ignition are ready. Use the reset button only after ensuring basic safety conditions are met.
Locating The Reset Button On Your Armstrong Unit
To locate the reset button, begin with safety: power down at the furnace switch and the main breaker before opening any panels. Common locations include the inside of the blower access panel near the burner or on the furnace control board. Some models place the reset button behind a service panel close to the ignition assembly. If the button isn’t visible, consult the owner’s manual or Armstrong’s official support site. If locating or accessing the button feels uncertain, contact a licensed HVAC technician for assistance.
Step-By-Step: How To Reset An Armstrong Air Furnace
Resetting should be done after confirming there are no gas leaks or ongoing safety hazards. If you smell gas, evacuate the area and call emergency services.
- Turn off power to the furnace at the dedicated switch and at the main circuit breaker. This stops the control board and blower from running during the reset.
- Wait 30 seconds to dissipate residual power and energy in the system.
- Open the access panel and locate the Reset button on the control board or near the burner.
- Press and release the Reset button (some models require pressing and holding for 1–2 seconds). You should hear or feel a click indicating the signal has been sent.
- Close the panel and restore power at the breaker. Return the thermostat to a heat setting if needed and observe the ignition sequence.
- Watch for a successful ignition and a normal burner operation, then allow the system to proceed through a full heat cycle.
- If the furnace does not relight after one reset, wait a couple of minutes, then try a single reset again. Do not repeatedly reset in quick succession, as this can mask deeper faults.
- If ignition does not occur after two attempts or if you notice unusual smells, seek professional service promptly.
Note: Some Armstrong models rely on a power cycle rather than a reset button. If your unit lacks a visible reset button, perform a full power cycle by turning the furnace off, waiting 60 seconds, and turning it back on after the panel is securely closed. If the problem persists, contact a licensed HVAC technician.
Alternative Reset Methods For Models Without A Reset Button
| Method | When To Use | Notes |
|---|---|---|
| Power Cycle | No reset button or the button fails to work | Turn off at switch and breaker, wait 60 seconds, turn on and test |
| Thermostat Reset | Thermostat communication issue | Turn off thermostat or set to off for a minute, then to heat |
Common Reasons A Reset Is Needed
Resetting is typically used after ignition failures, flame sensor issues, or safety lockouts. Dusty flame sensors, dirty filters, restricted venting, or a temporary gas supply interruption can trigger a fault that requires a reset. Sudden power interruptions or blown fuses may also cause a lockout that a reset can clear. While a reset can restore operation in some cases, it does not address underlying problems, so persistent faults demand professional diagnosis.
When Reset Is Not The Answer: Safety And Service Guidelines
If a reset does not restore heat, or if there are signs of danger, do not attempt further resets. Key safety indicators include a strong gas odor, hissing sounds, or flame rollout. Pay attention to frequent breaker trips or high CO readings from a nearby detector, which require urgent professional assessment. In such cases, a licensed HVAC technician should inspect the furnace, gas valve, ignition system, venting, and combustion safety—especially if the unit is older or has not received routine maintenance.
Maintenance Tips To Reduce Reset Frequency
Regular maintenance helps minimize ignition faults and lockouts. Schedule an annual professional inspection, replace disposable filters every 1–3 months, and clean or replace the flame sensor as needed. Ensure outdoors vents are clear of debris and that the furnace has adequate clearances for airflow. Calibrate the thermostat and test the system at the beginning of heating season. Consider a whole-house surge protector to prevent electrical fluctuations from causing intermittent faults.
Understanding Fault Codes And Indicators
Armstrong air furnaces typically use a control board with LED indicators or a fault code display. The number or pattern of blinks or flashes points to a fault category, such as ignition, flame sensing, or airflow issues. Because codes vary by model, consult the specific model’s manual for exact meanings and recommended actions. If you encounter fault codes, document the sequence and consult a technician if the message persists after a reset.