The Day and Night furnace brand is a common choice for American homes, and many models rely on a reset button as part of their safety controls. When a fault triggers a shutoff, the reset button can help restart the system after the issue is addressed. This guide covers what the reset button does, where to find it on typical Day and Night furnaces, and how to perform a safe reset. It also explains common causes of trips, maintenance tips to prevent nuisance resets, and when to call a professional. Safety and model-specific instructions from the owner’s manual should always take precedence.
About Day And Night Furnaces
Day and Night furnaces span several series designed for residential heating with gas-fired combustion or electric operation. These units typically integrate standard safety components such as limit switches, a flame sensor, a gas valve, a draft inducer, and a control board. The reset button may interact with one of these safety controls, depending on the model. While the exact design varies by model year, the underlying principle is consistent: a fault triggers a protective shutdown, and a reset can re-enable operation after a fault is resolved.
Understanding your specific model is essential. The homeowner’s manual for a Day and Night furnace will identify the exact location of the reset button, the correct reset sequence, and any model-specific caveats. If the manual is missing, downloaded editions from the manufacturer’s support site or a licensed technician can provide model-accurate guidance. General awareness of safeties, such as flame sensor cleanliness and airflow, helps interpret why a reset is necessary.
What The Reset Button Does
The reset button is part of a safety circuit designed to prevent the furnace from firing when a fault is detected. Common triggers include overheating, flame sensing irregularities, draft or pressure switch issues, or a transient fault in the ignition sequence. When the control detects a fault, it may lock out the furnace and illuminate an error code or indicator. Pushing the reset button clears the lockout and allows a fresh ignition attempt, provided the underlying issue is addressed.
It is important to note that a reset does not fix the root cause. If the problem persists after a reset, the unit will trip again, potentially indicating a maintenance need or a faulty component. Repeated resets can also mask a safety hazard. Therefore, use the reset as a diagnostic step, not a permanent solution. If flickering flames, gas odors, or unusual noises accompany a fault, discontinue use and seek professional service immediately.
Locating The Reset Button On Day And Night Furnaces
Location varies by model, but several common places are frequent on Day and Night furnaces. The reset button can appear on the gas valve assembly, on a control board inside the blower compartment, or on the front panel of the furnace’s access area. Some models use a small recessed button that requires a pin or flat tool to press, while others use a larger push button that accepts a finger press. Always ensure the furnace is powered off before attempting to touch components inside the cabinet.
For gas-fired units, the reset button is often near the burner assembly or on the gas valve housing. On higher-efficiency models, it may be near the internal control board and require removal of the service panel. If a model uses a separate flame sensor or ignition module, the reset may be associated with that module rather than a dedicated reset button. Because exact placement varies, consult the owner’s manual or manufacturer support for precise directions specific to the unit’s serial and model number.
Step-By-Step Reset Procedure
Follow these general steps, which apply to many Day and Night furnace models. Always ensure you have assessed safety risks before starting. If you detect natural gas odor, evacuate the area and call the gas company or emergency services.
1. Turn the thermostat to the OFF position to prevent a new call for heat. This helps ensure a safe shutdown of the heating cycle.
2. Switch off power to the furnace at the service disconnect or dedicated breaker. Wait 60 seconds to dissipate residual energy in the control circuitry.
3. Open the furnace access panel to reach the internal components. Do not touch exposed wiring or terminals while power is present, and wear eye protection if available.
4. Locate the reset button on the gas valve, control board, or ignition module, as described in the manual. If the button is recessed, use a thin tool to press and release it; for a standard push button, press firmly and release.
5. Press and hold the reset button for 5–10 seconds, then release. You may hear a click or see a light indicator indicating a reset attempt has occurred.
6. Restore power to the furnace, then set the thermostat to a heat call (e.g., 68–72°F). Observe the unit for ignition and normal operation for several minutes. If flame is established and the system runs smoothly, leave it in normal operation and monitor for stability.
7. If the furnace does not start after a reset, or trips again within a short period, power down, close the panel, and contact a qualified HVAC technician. Do not repeatedly reset in quick succession, as that can indicate a deeper fault that requires professional diagnosis.
8. If you notice any unusual smells, smoke, or a persistent gas odor after attempting a reset, evacuate and call emergency services. Safety comes first.
Common Causes For Reset Button Tripping
Reset trips are typically driven by safety-related faults. Understanding these causes helps in both prevention and proper action after a trip. The most frequent culprits include restricted airflow, dirty or blocked burners, a dirty flame sensor, or ignition problems resulting from improper gas pressure. A faulty draft inducer or misbehaving pressure switch can also cause blowers to shut down and trigger a reset. Thermostat calibration issues and incorrect wiring during recent maintenance can produce false triggers as well.
In many cases, routine maintenance—especially changing air filters, cleaning burners, and inspecting the flame sensor—reduces nuisance resets. Installation errors, such as improper venting or blocked exhaust paths, can also trigger safety shutoffs and resets. Addressing these root causes typically yields longer periods between resets and smoother operation across seasons.
Safety Considerations And When To Call A Pro
Furnace safety cannot be overstated. A reset should only be performed after confirming that immediate hazards are not present and that basic maintenance has been addressed. If there is any doubt about gas safety, ventilation, or ignition components, contact a licensed HVAC technician. Pro technicians can diagnose fault codes, test electrical connections, verify gas pressure, inspect venting, and perform combustion analysis to ensure safe operation.
Common signs that require professional service include persistent lockouts after a reset, flame rollout, yellowish flame (instead of a blue flame) indicating incomplete combustion, high carbon monoxide risk, or unusual clicking, banging, or grinding noises. If your home or furnace panel indicates an error code, refer to the manual or manufacturer’s support page for the meaning of the code and recommended actions. Do not ignore repeated faults; they point to underlying issues that could affect safety and efficiency.
Maintenance And Prevention Tips
Regular maintenance is the best defense against unexpected resets. Replace disposable air filters every 1–3 months during heating season or as needed when airflow is restricted. Keep furnace and surrounding area clean and free of dust, debris, and stored items. Schedule annual professional inspections to examine the burner, ignition system, flame sensor, heat exchanger, and venting. Ensure the return air ducts are unblocked and that supply vents have unobstructed flow. A well-maintained system tends to operate more consistently and efficiently, reducing reset events.
Additionally, verify thermostat operation and correct wiring after any service or replacement. If you notice a difference in furnace performance after a household system change (such as smart thermostat installation), confirm that the wiring and configuration match the furnace’s requirements. Keep a copy of the model and serial number for quick reference when seeking support. Finally, establish a simple diagnostic routine: check air filter, inspect the flame visually if safe, and listen for unusual sounds before assuming a fault that would require a reset.
Troubleshooting Quick Reference
| Symptom | Likely Cause | Recommended Action | Notes |
|---|---|---|---|
| Furnace trips during ignition | Flame sensor dirty or misaligned | Clean or replace flame sensor; verify ignition sequence | Use manufacturer guidance for sensor cleaning |
| Furnace overheats and shuts down | Restricted airflow, dirty filter | Replace filter; ensure return vents are open | Overheating is a common cause of limit switch trips |
| Reset button does not reset | New fault or persistent safety condition | Check for gas smell, test for proper venting; call pro | Repeated resets indicate a fault beyond a simple reset |
| Furnace starts but shuts off soon after | Gas valve or ignition issue | Inspect gas supply; professional service required | Gas systems require licensed technicians |
| Unusual odors or noises | Burner buildup, debris, or mechanical wear | Do not ignore; schedule inspection | Address promptly to prevent safety risks |
Frequently Asked Questions
Is resetting the furnace safe? Yes, when done according to the manual and with power off. Do not reset repeatedly if the unit continues to trip. Address the underlying fault first and consult a professional if unsure.
Will resetting fix all issues? Not necessarily. A reset clears the lockout but does not repair the root cause. If the same fault recurs, a diagnostic inspection is required.
Why does Day And Night furnace have a reset button? The reset button provides a controlled way to clear fault lockouts and reattempt ignition after addressing a safety condition. It is part of the furnace’s protective controls to prevent unsafe operation.
Should I reset after a power outage? If the unit remains off after a power outage, a reset may be necessary if the control board or safety circuits did not resume normal operation. Follow the manual’s restart procedure and monitor for further faults.
