Rheem AC Unit Reset Button: A Comprehensive Guide For Homeowners

If your Rheem air conditioning unit malfunctions or fails to start, the reset button may help restore its operation. This article provides in-depth guidance about the location, function, and proper use of the Rheem AC unit reset button, as well as key troubleshooting tips. Read on to find out when and how to safely reset your system and what to do if the issue persists.

Summary Table: Key Facts About Rheem AC Unit Reset Button

Feature	Details
Common Location	Near outdoor condenser, access panel, or control board
Purpose	Restore AC operation after system fault/trip
Typical Color	Red
Common Labeling	“RESET,” “RESTART,” or small button without label
When To Use	After a power surge, system lockout, or minor fault
Next Steps If Reset Fails	Check circuit breakers, thermostat, or call technician

What Is The Rheem AC Unit Reset Button?

A Rheem AC unit reset button is a safety feature included on most modern units. It serves to manually restore power to the air conditioner after it has shut down due to electrical issues, overheating, or system errors. The reset button helps prevent potentially damaging cycles by allowing the system to safely restart after troubleshooting the issue.

Where Is The Reset Button On A Rheem AC Unit?

The precise location of the reset button may vary by model, but it is commonly found:

• On the outdoor unit’s main panel, often beneath or near the wiring access cover
• Inside the control board compartment, typically behind a small panel
• It is usually a small red button, sometimes labeled “RESET” or “RESTART”
• On some units, it may be necessary to temporarily remove the access panel for visibility

For older models, consult the owner’s manual for a diagram specific to your AC unit.

What Does The Reset Button Do On A Rheem AC?

The reset button temporarily shuts down the unit’s electrical flow, clearing fault codes and restarting the system once pressed. It essentially acts as a manual circuit breaker for the AC’s control board or protective relay. When a problem, such as a power surge or overheating, causes the system to stop working, the reset button helps restore the connection once the underlying issue is resolved.

When Should You Use The Rheem AC Reset Button?

There are several common scenarios where pressing the reset button may be appropriate:

• The unit will not turn on after a power outage or surge
• The AC experiences a sudden, unexplained shutdown
• Minor tripped electrical circuits or faults that do not indicate mechanical failure
• After routine maintenance to clear error or lockout codes

Never use the reset button frequently. Persistent problems indicate a deeper electrical or mechanical issue that requires professional service.

How To Reset Your Rheem AC Unit: Step-By-Step Guide

To safely reset your Rheem AC unit, follow these steps:

1. Shut off power to the unit by turning off the circuit breaker for the outdoor condenser.
2. Wait at least five minutes to allow the unit to discharge residual power.
3. Restore power at the circuit breaker.
4. Locate the reset button—usually red and roughly pea-sized.
5. Firmly press and hold the button for 3–5 seconds. You may hear a click.
6. Wait for the unit to power up and observe if it operates normally.
7. Check the thermostat to ensure it is set to “Cool” with the correct temperature.

If the system fails to restart or trips again, do not press the reset button repeatedly. This could cause further damage.

Rheem AC Unit Not Working After Reset? Troubleshooting Next Steps

If the reset does not resolve the issue, further troubleshooting may be necessary. Here are steps to take:

• Check Your Thermostat: Ensure it has power (replace batteries if needed) and settings (“Cool,” fan “Auto”) are correct.
• Inspect Circuit Breakers: Verify that the AC’s dedicated breaker has not tripped. Reset if necessary.
• Examine Air Filter: Dirty filters restrict airflow, potentially causing shutdown.
• Clear Outdoor Unit: Remove leaves, debris, or obstructions from around the condenser for proper ventilation.
• Review Error Codes: Some Rheem models flash an LED code on the control board—consult your manual for meanings.
• Listen For Unusual Sounds: Clicking, buzzing, or grinding noises may indicate electrical or mechanical faults.

If none of these steps resolve the issue, contact a licensed HVAC technician for a full inspection.

Common Causes Of Rheem AC Unit Shutting Down Or Locking Out

Several issues can lead to a Rheem AC unit requiring a reset:

1. Power Surges/Outages: Electrical spikes, often due to weather events or service disruptions, can trip internal safety features.
2. Thermostat Problems: Faulty, miswired, or incorrectly configured thermostats may prevent normal operation.
3. Clogged Or Dirty Air Filters: Can cause overheating and system shutdown.
4. Blocked Condenser Or Coils: Leaves, dirt, and obstructions restrict airflow leading to overheating.
5. Refrigerant Issues: Low refrigerant levels can trigger safety lockouts to prevent compressor damage.
6. Electrical Or Control Board Malfunctions: Relays, capacitors, or control boards that fail often require professional replacement.

Addressing these root causes often eliminates the need for repeated resets.

How To Prevent Frequent Rheem AC Resets Or Lockouts

Consistent operation depends on preventive maintenance and attention to environmental factors. Key measures include:

• Change HVAC filters every 1–3 months
• Schedule seasonal AC inspections and tune-ups
• Keep the area surrounding the outdoor unit clear of debris
• Have your wiring and electrical disconnects checked annually
• Monitor refrigerant levels and ensure proper charge
• Invest in surge protection for your home’s electrical panel

Routine care greatly reduces the likelihood of system faults that require pressing the reset button.

Will Pressing The Reset Button On A Rheem AC Unit Cause Any Damage?

When used according to manufacturer instructions, the reset button is completely safe and designed for homeowner use. However, excessive use or pressing the button repeatedly to bypass fundamental problems may cause further electrical or mechanical issues. Never use force on the button—if it feels stuck or fails to trigger, contact a technician.

Reset Button Versus Power Cycling: What’s The Difference?

Reset Button: Instantly breaks electrical contact to clear faults and reset the control board.

Power Cycling: Involves switching the outdoor disconnect or breaker off and on—often used if a dedicated reset button is not present.

Both methods temporarily shut off power. The physical reset button, however, may also clear internal error codes or relay states, making it preferable if available.

Rheem AC Models: Do All Units Have A Reset Button?

While many modern Rheem central air conditioners include a reset button as standard, some older or budget models may not have one. In such cases, use the breaker or disconnect switch to cycle the power. Always consult the model-specific manual for guidance.

What If You Cannot Locate The Reset Button?

If you do not see a labeled button or red switch, try these steps:

• Check your Rheem user manual’s troubleshooting section for illustrations
• Look under the main electrical panel or behind the unit’s main access cover
• Confirm if your model instead uses only the breaker for resets
• Contact Rheem customer support with your model and serial numbers for guidance

Do not open sealed panels or control boxes without proper tools or experience.

When To Call For Professional Rheem AC Service

Homeowners should only use the reset button for isolated, minor faults. Call for professional service if:

• The system trips repeatedly or immediately after being reset
• There are burning smells, smoke, or visible scorch marks
• Water leaks from or near the indoor unit
• The thermostat displays error codes or the unit’s indicator lights flash continuously
• There are repeated issues even after following basic troubleshooting steps

Your safety and the health of your AC system should always take priority.

Frequently Asked Questions About Rheem AC Reset Buttons

Question	Answer
How Many Times Can I Use The Reset Button?	It is safe to use the button once or twice for isolated issues. Frequent use suggests a deeper problem—call a technician.
What Happens If The Button Is Stuck?	Do not force it. A stuck button may indicate an internal fault or mechanical obstruction—have it checked professionally.
Does Pressing Reset Affect Warranty?	No, using the reset button as outlined by the manufacturer does not void warranty. Unauthorized repairs or modifications may.
Will All Power Outages Trip The Reset?	Not always—severe surges and outages may require it, but many systems recover automatically.

Best Practices For Safe Use Of The Rheem AC Reset Button

• Always turn off power at the breaker before accessing panels
• Do not reset repeatedly—this can mask dangerous faults
• After a severe storm or flood, have a professional inspect your AC system
• Store your Rheem AC unit manual with diagrams for quick reference
• Label your system’s breaker and reset location for easy identification in emergencies

Proper and informed use of your Rheem AC unit reset button can quickly resolve minor system faults and help maintain overall efficiency.