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Key takeaways
- The reset button on an Armstrong Air Ultra 80 is typically on the burner assembly, but exact position varies; consult the manual or a technician.
- Always power off the furnace and wait 5 minutes before locating or pressing the reset button.
- Do not press the reset button repeatedly; diagnose the underlying issue first.
- Common reasons for reset button tripping include dirty fuel components or ignition faults.
- If unable to locate the reset button safely, contact a professional HVAC service.
Understanding the Reset Button on Oil Furnaces
The reset button on an oil furnace, including the Armstrong Air Ultra 80, is a safety device that cuts off fuel supply when the burner fails to ignite or experiences a fault. It is typically located on or near the burner assembly, often behind a small access panel or cover.
For the Armstrong Air Ultra 80 model, the exact position varies by year of manufacture and installed components. Common locations include the burner control box or transformer housing. Without the owner’s manual or service documentation, the precise position cannot be determined. Consult the unit’s manual or contact a qualified HVAC technician for accurate location details.
If the reset button has tripped, pressing it may restore operation, but the underlying issue must be diagnosed first. The reset button is usually a red or black button that protrudes slightly from the burner control.
Safety Precautions Before Locating and Pressing the Reset Button
Before locating or pressing the reset button on your Armstrong Air Ultra 80 oil furnace, turn off the power at the circuit breaker to prevent electric shock or accidental burner ignition. Wait at least 5 minutes for unburned oil vapor to dissipate, reducing fire risk.
Do not press the reset button repeatedly. If the furnace fails to start after one reset, the problem may be more serious: a clogged nozzle, faulty igniter, or blocked flue. Repeated resetting can damage components or create unsafe conditions. Contact a professional HVAC service for diagnosis.
Wear protective gloves and safety glasses when inspecting the burner area. The furnace and oil lines can be hot or contain pressurized oil. Avoid touching wires or uninsulated parts.
Steps to Locate the Reset Button on an Armstrong Air Ultra 80
Begin by reviewing the owner’s manual for your Armstrong Air Ultra 80 furnace. The manual contains a diagram showing the reset button location. If the manual is lost, a digital copy can often be found by searching the model number from the data plate on the furnace. If you are planning a new installation, our electric furnace sizing guide can help you determine the correct capacity.
If the manual is unavailable, visually inspect the burner area. Remove the front or side access panel (usually secured by screws or clips). Look for a small red or black button on the burner control box or attached to a relay. The button may be labeled 'Reset' or have a symbol resembling a circle with an arrow.
On many Armstrong models, including the Ultra 80 series, the reset button is near the burner primary control—a rectangular box with wiring connections. In some versions, it may be behind a plastic cover that can be snapped open. If you cannot locate it after a reasonable search, do not force any panel; seek professional assistance instead.
Troubleshooting After Resetting
Once you have found and pressed the reset button, restore power to the furnace and attempt to start it. Listen for the ignition sequence: the burner fan should run, sparks or a flame should appear, and the furnace should begin producing heat. If the reset button trips again immediately or within a short while, the problem is likely still present.
Common reasons for repeated tripping include: a dirty or clogged oil filter, obstructed fuel nozzle, faulty ignition transformer, or inadequate air supply. These require professional cleaning, adjustment, or part replacement. Do not continue resetting the furnace—it may lead to unsafe conditions.
If the furnace runs but then stops frequently, check the thermostat settings, fuel supply, and venting system. Blocked vents can cause safety limit switches to open, mimicking a reset button trip. For more information, refer to our natural gas furnace venting guide and oil furnace chimney cleaning schedule.
Frequently asked questions
What does the reset button do on an oil furnace?
The reset button is a safety device that interrupts fuel supply when the burner fails to ignite. Pressing it manually allows the furnace to retry the ignition sequence.
How can I find my Armstrong Air Ultra 80 owner’s manual?
Check the furnace’s data plate for the model number, then search online using that number. Many manuals are available from Armstrong Air’s website or third-party sources.
What should I do if the reset button keeps tripping?
Stop resetting and call a professional technician. Repeated tripping indicates a persistent problem such as a clogged nozzle, faulty igniter, or blocked vent.
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