The Rheem furnace reset button is a simple control that can restore a furnace after certain safety shutoffs or electrical interruptions. This guide explains what the reset button does, when it should be used, step-by-step reset instructions, troubleshooting, safety precautions, and when to call a professional. The emphasis is on safe, informed action to avoid repeated resets that mask underlying faults.
| Topic | Key Takeaway |
|---|---|
| Purpose | Resets control board after safety trip or power issue |
| When To Reset | After power outages, brief error codes, or following ignition lockouts when safe |
| When Not To Reset | Repeated trips, gas smell, continuous lockouts — call technician |
| Safety Steps | Turn off power/gas, wait, inspect, then reset once |
What The Rheem Furnace Reset Button Does
The reset button on Rheem furnaces is a manual override that clears certain error conditions or lockouts in the control system. It is often used after a safety device trips, an ignition failure, or an electrical disturbance. Pressing it tells the board to attempt a restart sequence. It is not a repair tool; it is a temporary recovery step.
Common Models And Button Location
Location varies by model but the reset is typically found on the blower motor housing, the furnace control board, or under the access panel. Some Rheem units label it “Reset” or use a red button. Consult the furnace’s nameplate and owner’s manual for the exact location for a specific model.
When To Use The Reset Button
Use the reset button after these situations: brief power interruptions, one-time ignition failures, or after replacing a failed component when the system still shows a fault. A single reset can return the furnace to normal operation when the underlying cause was transient.
When Not To Use The Reset Button
The reset button should not be pressed repeatedly or used as a quick fix for recurring problems. Do not reset if there is a smell of gas, visible damage, continuous error lights, or repeated lockouts. Repeated resets can create unsafe conditions and hide a serious malfunction.
Step-By-Step Safe Reset Procedure
Follow this procedure to reset a Rheem furnace safely and minimize risk.
1. Observe Error Indications
Check the furnace status lights, the thermostat display, and any error codes. Note whether the issue is a one-time fault or a repeating lockout. Documenting error patterns helps troubleshooting.
2. Turn Off Power
Switch off the furnace at the service switch or at the breaker panel. Cutting power prevents accidental ignition and protects electronics. Wait at least 30 seconds to allow capacitors to discharge.
3. Inspect For Obvious Problems
Look for loose wiring, burnt components, clogged filters, blocked vents, a tripped limit switch, or accumulation of dust and debris. Check for a gas odor; if present, evacuate and call the gas company immediately.
4. Restore Power And Reset
Restore power to the furnace. Press the reset button once for models that require a push. Hold times vary; follow manufacturer guidance—typically a brief press is sufficient. Do not hold the button down for more than a few seconds unless the manual directs it.
5. Observe The Restart
Allow the furnace to run through one full start-up cycle and monitor for normal ignition, blower operation, and no abnormal noises. Watch the status LED for error codes or continued lockout indications.
Troubleshooting If Reset Doesn’t Work
If the furnace fails to restart or trips again, systematic troubleshooting is required rather than repeated resets.
Check Thermostat And Power
Verify the thermostat is calling for heat and working batteries if applicable. Confirm the breaker and service switch are on. Check fuses on the control board.
Inspect Ignition And Flame Sensors
Common causes of ignition lockouts include dirty flame sensors, faulty igniters, or defective gas valves. A dirty flame sensor can be cleaned with a soft cloth to restore reliable sensing.
Examine Venting And Combustion Air
Blocked vents, bird nests, or frozen condensate drains can cause pressure switch or limit switch trips. Ensure intake and exhaust terminations are clear and condensate traps are unobstructed.
Look For Error Codes
Rheem furnaces use LED flash codes to indicate faults. Record the sequence (e.g., three flashes, pause, two flashes) and consult the manual to identify the root cause. Error codes speed diagnosis and avoid unnecessary parts replacement.
Common Causes Of Repeated Trips
Understanding underlying causes prevents unsafe resets and recurring service calls.
- Dirty Air Filter: Restricts airflow and causes high heat or limit trips.
- Blocked Vents/Ducts: Creates pressure problems and system stress.
- Faulty Flame Sensor or Igniter: Prevents reliable ignition and leads to lockout.
- Pressure Switch and Venting Issues: Induced draft or vent blockages cause failures.
- Electrical Problems: Loose wiring, failing capacitors, or control board faults trigger shutdowns.
Safety Precautions
Safety should be the primary concern when interacting with fossil-fuel appliances.
- Never ignore a persistent gas odor; evacuate and call the gas company.
- Do not repeatedly press the reset button; limit to one or two attempts unless directed by a technician.
- Turn off electrical power before inspecting internal components to avoid shock hazards.
- Use a flashlight and insulated tools if minor checks are required; avoid contact with hot surfaces.
When To Call A Professional
Contact a licensed HVAC technician when reset attempts fail, the furnace repeatedly locks out, there are electrical smells, or after any gas-smell event. Professionals can perform safe gas valve and ignition system tests, confirm correct venting, replace worn components, and interpret control board diagnostics.
Preventive Maintenance To Avoid Resets
Regular maintenance reduces the likelihood of trips and extends system life.
- Change or clean air filters every 1–3 months depending on use and indoor air quality.
- Schedule annual professional inspections and tune-ups before the heating season.
- Keep intake and exhaust terminations free from debris, snow, and ice.
- Clean flame sensors and burners during annual service to prevent ignition issues.
- Monitor and replace aging components like igniters and capacitors proactively.
Understanding Control Board LED Codes
Rheem control boards display error codes via LED flash sequences that identify faults such as pressure switch open, flame failure, or limit trips. Refer to the furnace manual or the Rheem online resource for the specific code table matching the model. Recording the LED pattern saves diagnostic time.
Replacement And Repair Considerations
Deciding between repair and replacement depends on the furnace age, repair cost, and efficiency. Repeated failures of core components or a control board may justify replacement. Consider a professional energy assessment and quotes from licensed contractors to weigh long-term costs.
Frequently Asked Questions
How Many Times Can The Reset Button Be Pressed?
Press the reset button only one or two times for a transient fault. Repeated presses may hide recurring safety issues and increase risk. Always investigate recurring trips.
Is The Reset Button A Safety Device?
The reset button is not a primary safety device; it is a manual control to restart the system after a protective shutdown. Primary safety devices include limit switches, pressure switches, and flame sensors.
Can A Homeowner Replace A Faulty Igniter?
Skilled homeowners comfortable with basic electrical safety and gas systems can replace an igniter if model-specific instructions are followed and power is off. For gas valve or control board work, a licensed technician is recommended.
Resources And Manufacturer Guidance
For model-specific instructions, error code tables, and replacement parts, consult the Rheem owner’s manual or the official Rheem website. Manufacturer documentation provides safety warnings, exact button locations, and the correct reset procedures for specific units.
Key Takeaway: The Rheem furnace reset button is a useful troubleshooting step after transient faults but should be used cautiously. If the furnace trips repeatedly, exhibits gas odors, or displays persistent error codes, professional service is required to ensure safe, reliable operation.