Intertherm furnaces are a common choice for homes across the United States, valued for reliability and straightforward maintenance. A key safety feature on these systems is the reset button, a small push-button that helps clear fault conditions and restart the furnace after a protection trip. Knowing where to locate the reset button, when to use it, and how to proceed safely can save time and reduce unnecessary service visits. This guide covers Intertherm models, with practical steps, safety considerations, and maintenance tips for responsible homeowners.
What Is The Intertherm Furnace Reset Button?
The Intertherm furnace reset button is a safety feature designed to clear protective fault conditions and allow the system to attempt ignition again after a shutdown. It is not a routine restart or a thermostat reset. On many Intertherm models, the reset control is a small red or yellow push-button located on the blower housing or inside the service panel near the burner assembly. Some units require a full power-cycle through the switch or breaker to reset the system if a dedicated button is not present.
Reset functionality is tied to the furnace’s safety sequence, which protects against issues like heat overload, flame sensor problems, or venting faults. If the button trips repeatedly, it often signals an underlying issue that needs diagnosis beyond a simple reset. Homeowners should consult the manual for their exact model and avoid repeated resets if the fault persists.
When Should You Use The Reset Button?
Use the reset button only after the furnace has cooled and the underlying fault is addressed or cleared. Common scenarios include a transient ignition fault, a brief flame-out, or a safety shutoff that has reset after power cycling. If the furnace trips due to an ignition or sensor problem, a reset may restore operation for a short period. If there is a persistent fault, or if you smell gas, hear hissing, or detect a strong gas odor, do not reset and leave the area immediately.
Do not rely on resets as a substitute for professional maintenance. Frequent resets can mask ongoing problems and lead to safety risks or equipment damage. If the furnace repeatedly trips after a reset, arrange a service visit to diagnose flame sensors, venting, gas supply, airflow, or control board issues.
Step-By-Step Guide To Resetting An Intertherm Furnace
- Turn off the thermostat and switch the furnace or circuit breaker to the OFF position to ensure a complete power-down.
- Wait 5–10 minutes to allow the system to cool and residual pressures to normalize.
- Open the service panel and locate the reset button, usually red or yellow and labeled Reset, or locate a reset switch on the control board or limit switch assembly.
- Press and hold the reset button briefly, or press and release as directed by the model manual. In some units you may need to press and hold for 3–5 seconds, then release.
- Close the panel and restore power by switching the furnace back on at the breaker or the thermostat.
- Set the thermostat to heat and observe whether the furnace ignites and the blower comes on after ignition. If you hear a safe ignition and the furnace continues running, it has reset successfully.
- If the furnace does not restart, trips again, or you still notice a fault indicator, do not attempt further resets. Contact a licensed HVAC technician for diagnosis and repair.
Always follow the model-specific instructions in the Intertherm manual. If you are unsure about the exact location of the reset button or the proper reset procedure for your unit, consult the manual or contact a technician. Never bypass safety features or ignore the warning signs of a gas leak or carbon monoxide risk.
Common Issues That Trigger Reset Button Trips
Understanding the typical causes helps prevent unnecessary resets and guides troubleshooting. The following table outlines common issues, symptoms, likely causes, and recommended actions.
| Issue | Common Symptoms | Likely Cause | What To Do |
|---|---|---|---|
| Dirty flame sensor or dirty burner | Furnace fails to ignite; intermittent ignition | Dirt or residue on flame sensor or burner | Inspect, clean with alcohol and a soft cloth; replace sensor if damaged; ensure burner is clean |
| Overheating or restricted airflow | Frequent trips; short cycles | Clogged air filter, blocked ducts, or closed VAV dampers | Replace air filter; clear obstructions; ensure adequate airflow around the return and supply registers |
| Venting or pressure switch fault | Inducer won’t start; no ignition | Blockage in vent, condensate buildup, or faulty pressure switch | Inspect vent pipe for obstructions; empty condensate trap; test or replace pressure switch with professional help |
| Gas supply or valve issues | No ignition; gas smell or odor | Gas valve or supply problem | Turn off gas supply and call a professional; if you smell gas, evacuate and contact emergency services |
Note: Some models may display fault codes via indicator lights or a digital display. Refer to the manual for fault code meanings and recommended actions. If multiple faults occur, schedules for service are advised rather than repeated resets.
Safety Tips And When To Call A Pro
Safety is paramount with any furnace reset. Always ensure good ventilation and functioning carbon monoxide detectors in the home. If there is any suspicion of a CO leak, leave the building and call emergency services. Do not bypass safety controls or continue resetting a furnace that repeatedly trips. If you are uncomfortable performing a reset or cannot locate the reset button, contact a licensed HVAC technician. Regular professional maintenance can prevent many common reset triggers.
Additionally, maintain clear space around the furnace, keep the condensate drains clear on high-efficiency units, and schedule annual inspections. A technician can verify flame sensing accuracy, inducer function, vent integrity, electrical connections, and control board health to reduce unsafe resets and extend furnace life.
Maintenance Tips To Reduce Reset Trips
- Replace furnace air filters every 1–3 months, depending on use and indoor air quality.
- Keep the area around the furnace free of clutter, dust, and combustibles.
- Schedule annual professional inspections to test flame sensors, gas valves, venting, and safety limits.
- Ensure proper duct design and airflow, addressing leaks and obstructed registers.
- Inspect and clean condensate lines and traps in high-efficiency units to prevent humidity-related trips.
Additional Resources For Intertherm Models
For model-specific details, consult the Intertherm owner’s manual and the official support site for Nordyne/Nordyne brands, or contact a local HVAC professional. Retain model and serial numbers for quick reference when seeking troubleshooting guidance or replacement parts. If a manual is unavailable, a licensed technician can identify the correct reset procedure and safety checks for your particular Intertherm unit.
