Your Guide to Resetting Rheem Appliances: Expert Tips from Your Local Rheem Pro Partner.

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reset button

I. Introduction: Your Trusted Rheem Pro Partner

For homeowners, maintaining a comfortable and functional living environment is paramount. This often relies on the reliable operation of essential home systems, particularly heating, ventilation, air conditioning (HVAC), and plumbing appliances. As a long-standing fixture in the HVAC and plumbing industry with two decades of experience, our company understands the frustrations that arise when these critical systems encounter issues. This guide aims to equip homeowners with the knowledge necessary to safely and effectively address common Rheem appliance resets, including the Rheem water heater reset button, Rheem AC reset button, and Rheem furnace reset button procedures, offering practical steps and clear indicators for when professional intervention is required.
Just last winter, I got a call from a family in Weirton, WV – barely a ten-minute drive from our shop in Steubenville, Ohio. Their Rheem electric water heater’s reset button kept tripping, leaving them without hot water. They had tried pressing the Rheem water heater reset button multiple times, but it wouldn’t hold. Our team quickly diagnosed that the frequent tripping wasn’t a simple fix; it pointed to an underlying electrical issue that needed professional attention. We resolved the problem, restoring their hot water and peace of mind. It’s moments like these, serving our neighbors, that truly underscore our commitment to reliable, prompt service.
Understanding Your Rheem Appliance’s Reset Function: A Safety Feature
Many Rheem appliances, from water heaters to furnaces and AC units, are equipped with a Rheem reset button or a specific reset procedure. This functionality is not
merely a convenience for minor glitches; it serves as a critical safety mechanism designed to protect both the home and the appliance from potential damage, particularly from conditions like overheating or electrical anomalies.1 Understanding when and how to properly utilize this reset function is fundamental to safe and effective initial troubleshooting. A reset typically interrupts power to the system, allowing internal controls to re-evaluate operating conditions and restart safely.
II. Essential

II. Essential Safety Precautions Before Any Reset

Before attempting any troubleshooting, inspection, or reset procedure on a Rheem appliance, prioritizing safety is paramount. HVAC and plumbing systems involve inherent hazards such as electricity, natural gas or propane, and pressurized hot water, all of which can pose serious risks if not handled correctly. Adhering to strict safety protocols is non-negotiable.
Prioritizing Your Safety: Electrical, Gas, and Water Shut-Offs
The foundational step before interacting with any appliance is to ensure all potential energy sources are safely disengaged.
For electrical safety, it is imperative to always turn off the power to the appliance at the dedicated circuit breaker in the home’s main electrical panel.4 This action prevents electrical shock and guards against further damage to the appliance. When working with electrical components, the use of insulated tools and wearing rubber-soled shoes is also recommended to minimize risk.15
Regarding gas safety, for appliances such as gas furnaces and water heaters, the gas supply must be turned off at the main gas valve leading to the appliance.11 This is a critical step to prevent gas leaks and potential explosions. If a gas odor is detected at any point, it is crucial to
immediately cease all activity. Homeowners should evacuate the premises, call their gas supplier or the fire department from a neighbor’s phone, and not re-enter the building until authorized by emergency personnel.16 Attempting any reset or
electrical work in the presence of a gas leak is extremely dangerous.
For water safety, particularly with water heaters, awareness of potentially very hot discharged water is necessary.31 If leaks are suspected or if internal components need to be accessed, the main water supply to the unit should be turned off.13 Wearing heat-resistant gloves is advisable when handling hot water systems.15
Beyond specific appliance considerations, general personal protective equipment (PPE) should always be utilized. This includes safety glasses to protect against debris or splashes, work gloves (both nitrile for chemical protection and leather for cuts), and non-slip safety boots to prevent falls on wet surfaces.15 Knee pads and coveralls can also enhance comfort and provide additional protection during work.15
While general guidelines apply, the exact location of Rheem reset button location and specific procedures can vary significantly by Rheem model and year of manufacture.6 Therefore, consulting the specific Rheem owner’s manual for the appliance in question is always recommended for precise instructions and safety warnings.27 This ensures that the correct procedure for a particular unit is followed, mitigating risks associated with incorrect troubleshooting.
When to Call a Professional Immediately
While this guide provides valuable troubleshooting steps, certain situations unequivocally demand immediate professional attention. Attempting DIY repairs in these circumstances can be dangerous and may exacerbate the problem. Homeowners should promptly contact a qualified HVAC and plumbing professional if they encounter any of the following:
● Gas Leaks: Any detection of a gas odor, no matter how faint, necessitates immediate evacuation and professional assistance.16
● Persistent Electrical Issues: If circuit breakers repeatedly trip after a reset, or if there are accompanying signs like burning smells, visible scorch marks, or damaged wiring, professional electrical diagnosis is critical.1 These issues can pose serious fire hazards.
● Significant Water Leaks: Any substantial water leakage from the appliance or its connections, especially if it appears to be more than condensation, indicates a potential structural or component failure that requires immediate attention.7
● Unusual Noises or Smells: Persistent banging, screeching, grinding, or a
continuous burning or musty odor emanating from the appliance are often indicators of serious mechanical or electrical malfunctions that require expert assessment.3
● Physical Damage: Visible cracks on the unit, extensive corrosion, or any signs of flood or fire damage to the appliance signal a compromised system that should not be operated.1
● Non-Responsive Reset Button: If the reset button fails to click when pressed, or if it immediately trips again after being reset, it indicates a deeper underlying problem that cannot be resolved by simple resets.46
● Lack of Confidence: At any point during the troubleshooting process, if a homeowner feels uncomfortable, unsure, or lacks the necessary tools or expertise, contacting a qualified HVAC and plumbing professional is always the safest and most prudent course of action.1
The reset button on Rheem appliances serves as a crucial safety mechanism, designed to interrupt power when internal temperatures exceed safe levels.1 This means that a tripped button is often a symptom of an underlying problem, rather than the problem itself. While a reset might temporarily restore function, frequent tripping is a clear warning sign that professional diagnosis is needed. This frames the homeowner’s initial attempt at resetting as a diagnostic step, which, if unsuccessful or recurring, naturally leads to a professional service call. This mechanism is key to ensuring safety and preventing further damage.

III. Resetting Your Rheem Water Heater (Electric & Gas Models)

Water heaters are fundamental to daily comfort, and when they stop providing hot water, it can be a significant inconvenience. Rheem water heaters, whether electric or gas, incorporate safety features that may require a reset. If you’re wondering, “does a Rheem water heater have a reset button,” the answer is yes, for most electric models. This section covers the Rheem hot water heater reset button and reset button Rheem water heater.
A. Electric Water Heaters
Electric water heaters are equipped with a safety device known as the Energy Cut-Off (ECO) or high-limit control, which is typically activated by a small red Rheem electric water heater reset button. This also applies to the Rheem Performance water heater reset button and Rheem Gladiator water heater reset button.
Locating the Reset Button
The reset button on a Rheem water heater is generally a small red button.1 Its most common location is on the upper thermostat, often concealed behind a removable access panel.4 Some models may feature two access panels—one at the top and one at the bottom—with the
Rheem water heater reset button location typically situated under the top panel.4 Accessing this panel usually requires a Phillips or flathead screwdriver to remove the securing screws.4 Once the panel is removed, a layer of insulation often needs to be carefully pulled back to expose the reset button.4
Step-by-Step Reset Procedure

  1. Safety First: Turn Off Power. Before touching any part of the water heater, locate the home’s circuit breaker box. Identify and switch off the breaker specifically labeled for the water heater. If the breakers are not clearly labeled, it is safest to turn off the main breaker for the entire home to ensure no power is reaching the unit.4
  2. Locate the Reset Button. Proceed to the water heater. Using a screwdriver, carefully remove the top access panel.4 Gently pull back any insulation material to expose the red reset button, which is typically found on the upper thermostat.4
  3. Press the Button. Firmly press the red reset button until a distinct click is heard.4 This audible click confirms that the safety mechanism has been reset.
  4. Restore & Monitor. Carefully replace the insulation and re-secure the access panel with its screws.4 Return to the circuit breaker box and flip the water heater’s breaker back to the “ON” position.4
  5. Wait for Hot Water. Allow time for the water to heat. Depending on the tank size,
    it may take anywhere from 30 minutes to 1.5 hours for the water to reach the desired temperature. It is advisable to monitor the water temperature to ensure it heats properly and does not overheat.4

Common Reasons Your Electric Water Heater Trips

The Rheem water heater reset button typically trips when the internal water temperature exceeds a safe threshold, usually around 150°F or 180°F.1 While a single trip might be due to a minor fluctuation, frequent or repeated tripping of the reset button is a strong indicator of a more serious underlying issue that requires attention.1 This can also be referred to as the
Rheem hot water heater keeps tripping reset button.
Several factors can lead to this overheating and subsequent tripping:
● Faulty Thermostat: The water heater relies on two thermostats (upper and lower) to regulate water temperature. If either thermostat malfunctions, it may fail to signal the heating element to shut off, leading to continuous heating and excessive water temperature.
● Loose Wiring: Over time, the electrical connections within the water heater can become loose due to normal wear or improper installation. Loose or damaged wiring can generate excessive heat, which then triggers the reset button as a safety precaution. This condition is particularly concerning as it poses a risk of electrical fires.
● Corroded Components: The moist environment inside a water heater can lead to corrosion of internal electrical components over time. Corrosion can impair the performance of thermostats or other parts, causing the system to overheat and trip the reset button.1
● Grounding Issues: Problems with grounding, often involving a heating element shorting to the ground, can cause the water temperature to rise uncontrollably, activating the reset button.1
● Malfunctioning High-Limit Switch (ECO): The Energy Cut-Off (ECO) switch itself, which houses the reset button, can become faulty due to wear and tear. In such cases, it might trip even when the water temperature is not excessively high.1
● Burnt-Out Heating Element: A heating element that is burnt out or compromised can draw an excessive amount of power or expose internal wiring to
moisture, leading to frequent trips of the safety mechanism.
● Electrical Wiring Issues (Beyond the Unit): The problem might not lie within the water heater itself but with the home’s electrical wiring. Old or improperly grounded house wiring, or poor connections along the electrical line, can cause voltage irregularities. These fluctuations can trigger the water heater’s sensitive safety sensors, causing it to shut down even if the main circuit breaker does not trip.17

What to Do if the Reset Button Won’t Click or Stays Tripped

If the Rheem water heater reset button not working or does not click when pressed, or if it immediately trips again after being reset, this is a strong indication of a more significant underlying problem that requires immediate attention. In such scenarios, repeatedly pressing the button is ineffective and can be dangerous.2 This can also be referred to as the
Rheem water heater reset button not clicking.
Common causes for a non-responsive or persistently tripping reset button include:
● Faulty Thermostat: This is the most prevalent reason for a reset button that won’t click or continuously trips. The thermostat is failing to accurately regulate the water temperature, causing the high-limit switch to constantly activate as a safety measure.
● Grounded Heating Element: A heating element that has developed an electrical short to ground can cause continuous and uncontrolled overheating, preventing the reset button from staying engaged.
● Damaged High-Limit Button/ECO: The reset button or the entire high-limit control assembly can fail due to internal wear and tear or electrical stress.37
● Broader Electrical Problems: Issues within the home’s electrical system, including a weak or faulty circuit breaker, can lead to persistent tripping of the water heater’s safety mechanisms.
When these conditions arise, it is imperative to contact a professional for diagnosis and repair. A qualified technician can safely test components like thermostats and heating elements with a multimeter and address any complex electrical or component failures.

Table 1: Common Rheem Electric Water Heater Reset Issues & Solutions

Issue Type
Common Causes (DIY Check)
When to Call a Professional (Signs & Reasons)
No Hot Water / Frequent Trips
Power outage (check breaker); Thermostat set too low; Occasional overheating (initial trip)
Reset button won’t click/stays tripped ; Persistent overheating/tripping 1; Loose/corroded wiring suspected ; Strange noises/smells 6; Visible physical damage.
Overheating
Thermostat malfunction; Loose wiring; Corroded components; Grounding issues; Malfunctioning high-limit switch (ECO); Burnt-Out Heating Element
Any of the above causes confirmed or suspected; Electrical wiring issues outside the unit 17; Water is dangerously hot.4
Reset Button Not Responding
Faulty thermostat; Grounded heating element; Damaged high-limit button/ECO; Broader electrical problems
Button does not click or immediately trips again ; Suspected electrical issues in home wiring ; Appliance is old and frequently malfunctioning.
B. Gas Water Heaters
Unlike electric models, Rheem gas water heater reset button typically do not feature a red electrical reset button. Their safety mechanisms and common issues often revolve around the pilot light and gas control valve. This also applies to the Rheem hot water reset button.

Pilot Light and Gas Valve Reset

When a gas water heater isn’t functioning, the issue frequently stems from the pilot light being out or a problem with the gas control valve. A common reset procedure for many Rheem gas water heaters involves specific manipulation of the gas control knob:

  1. Turn Thermostat to Low/Off. Begin by setting the water heater’s thermostat to its lowest temperature setting or turning it off.
  2. Cycle Gas Valve: Within a rapid 30-second window, quickly turn the gas control knob from the “Low” setting to “Very Hot” (or a similar high temperature setting) and then back to “Low,” repeating this cycle seven times. A distinct click should be heard, and if present, the pilot light indicator should illuminate, confirming a successful reset and ignition.
  3. Set Desired Temperature. Once the reset is confirmed, the thermostat can be set back to the desired water temperature.63
    Common Issues and When to Call for Service
    If a gas water heater fails to ignite, or if the pilot light will not stay lit after attempting the reset procedure, several underlying issues could be at play:
    ● Insufficient Gas Supply: It is important to verify that the gas supply to the water heater is adequate. Checking if other gas appliances in the home (e.g., stove, furnace) are working. This can help determine if there’s a general gas supply problem. For homes using propane, confirming that the propane tank is not empty and that the gas valve to the water heater is fully open is essential.50 This relates to the Rheem gas water heater reset button location.
    ● Blocked Exhaust or Venting System: Proper venting is crucial for the safe and efficient operation of gas water heaters. Obstructions such as debris, animal nests, or even ice in the vent pipes can prevent proper ignition as a safety measure.50
    ● Faulty Igniter or Thermocouple: The igniter is responsible for creating the spark or heat to light the gas. If it is malfunctioning or coated with dirt, it may fail to ignite. Similarly, the thermocouple, which senses the presence of the pilot flame and allows gas to flow, can become faulty, causing the pilot light to extinguish or not light at all.50
    ● Low Gas Pressure: Insufficient gas pressure delivered to the water heater can prevent the burner from igniting properly, triggering an ignition failure.50
    ● Improper Grounding/Wiring: Although less common than with electric models,
    electrical issues, including improper grounding or damaged wiring, can interfere with the ignition sequence of a gas water heater.50
    While homeowners can perform checks for gas supply and visible obstructions in the venting system 50, issues related to internal components such as igniters, thermocouples, gas pressure regulation, or complex electrical problems require the expertise of a professional plumber due to the inherent safety risks associated with gas and electrical systems.50

IV. Resetting Your Rheem Tankless Water Heater

Rheem tankless water heaters offer on-demand hot water, but like any appliance, they can occasionally require a reset, often indicated by error codes on their digital displays. This includes models like the Rheem RETEX-18 reset button, Rheem RETEX-27 reset button, Rheem RTEX-13 reset button, and Rheem RTE 13 reset button.
A. Locating the Reset Button and Understanding Error Codes
The Rheem tankless water heater reset button is typically located on the front or right side of the unit, though some models may have it on the back.12 This button is often behind a cover plate that needs to be removed with a screwdriver.12 This is the
Rheem tankless water heater reset button location.
A key advantage of modern tankless units is their diagnostic display, which shows specific error codes when a malfunction occurs. These codes provide valuable information about the nature of the problem, guiding both homeowners and technicians toward a solution. For instance, Rheem Error Code 11 commonly indicates an ignition failure or an issue with the ignition sensor. This is often referred to as the Rheem tankless water heater code 11 reset button. Other codes, such as 00 (continuous combustion), 05 (imperfect combustion), 12 (flame failure), 14 (overheat), 16 (over temperature warning), and various sensor or fan faults, also point
to specific system anomalies.
B. Step-by-Step Reset Procedure
Reset button on Rheem tankless water heater generally involves a power cycle, sometimes combined with a button press:

  1. Safety First: Disconnect Power. The most crucial step is to disconnect the tankless water heater from its electrical power source. This is a safety measure. For units plugged into an outlet with a GFI, simply unplugging the cord may suffice. For direct-wired units, the corresponding circuit breaker in the main electrical panel must be flipped to the “OFF” position.7
  2. Locate and Access the Reset Button (if applicable). For models with a physical reset button, it is typically located on the front or right side, possibly behind a cover plate secured by screws.12 Carefully remove the cover and any insulation to expose the button.12
  3. Press the Reset Button. Once located, press the reset button. For some models, a specific sequence might be required, such as holding an “up” arrow button for 5-10 seconds until a temperature flashes, then pressing a “down” arrow while still holding the “up” arrow, and releasing both to unlock the controller.67 For other models, simply pressing the button until a click is heard may suffice.12
  4. Allow System to Reboot. After pressing the reset button, allow the unit to enter “reset mode” and complete its internal reboot process. This might be indicated by a light changing from red to green, and a waiting period of 10-30 seconds is often recommended for the system to fully reset.12
  5. Restore Power & Monitor. Return to the circuit breaker and restore power to the unit.12 Set the thermostat to the desired temperature.12 Monitor the display for any recurring error codes.
    C. Common Issues and When to Call for Service
    If a tankless water heater continues to display an error code or fails to operate after a reset, it points to a deeper issue. The digital display of error codes provides a clear indication of the problem, which, while helpful for initial understanding, often requires
    professional expertise for resolution. If your Rheem tankless water heater not heating reset button attempts are unsuccessful, professional help is needed.
    For Rheem tankless water heater code 11 reset button issues (Ignition Failure), common causes include insufficient gas supply (check other gas appliances, propane tank level), a blocked exhaust or venting system (inspect for debris or nests), a faulty igniter or ignition sensor, low gas pressure, or improper grounding. While checking gas supply and visible vent obstructions can be done by a homeowner, issues with igniters, gas pressure adjustments, or internal component repairs are best left to a professional due to safety concerns and the delicate nature of these systems.
    Other common error codes and their implications include:
    ● Code 00: Continuous combustion for over an hour, potentially due to continuous circulation pumps or a blocked vent.68
    ● Code 05: Imperfect combustion or air supply/exhaust blockage.68
    ● Code 12: Flame failure.
    ● Code 14/16: Overheat or over temperature warning, possibly indicating a clogged heat exchanger or restricted airflow.
    ● Code 21/24: Malfunction of air intake filter switch or operational switch.68
    ● Code 29/33/34: Heat exchanger outlet temperature too low or sensor faults.68
    ● Codes 51/52/61: Gas solenoid valve faults or combustion fan failure.68
    ● Codes 71/72: Flame sensing device faults or false flame detection.
    ● Code 79: Fan motor current fault.68
    Many of these codes, particularly those related to gas, combustion, or internal component failures, indicate complex issues that require specialized tools and expertise for proper diagnosis and repair. Attempting to fix these without proper training can be dangerous and may void the unit’s warranty.50
    Table 2: Common Rheem Tankless Water Heater Error Codes & Solutions
    Error Code
    Fault Condition (DIY Check)
    When to Call a Professional (Signs & Reasons)
    00
    Continuous combustion (check if hot water taps are closed, circulation pumps are off) 68
    Persistent combustion; Blocked vent system suspected.68
    05
    Imperfect combustion; Air supply/exhaust blockage (check for visible obstructions) 68
    Persistent imperfect combustion; Internal blockages in heat exchanger/fan; Unsure how to clean.68
    11
    No Ignition ; Gas supply insufficient (check other gas appliances, propane tank); Blocked venting (check for visible obstructions) 50
    Faulty igniter/ignition sensor ; Low gas pressure 50; Improper grounding/wiring 50; Error persists after reset.50
    12
    Flame Failure
    Dirty/faulty flame sensor; Gas valve issues; Control board malfunction.68
    14/16
    Overheat/Over Temperature Warning ; Restricted airflow around unit 69
    Clogged heat exchanger 69; Faulty temperature sensor 68; Persistent overheating.
    21/24
    Malfunction of Air Intake Filter Switch/Operational Switch 68
    Filter door not seated; Front panel not properly installed; Internal switch malfunction.68
    31/33/34
    Room/Overheat/Combustion Air Temperature Sensor Fault 68
    Sensor wiring damage; Sensor needs cleaning/replacement.68
    51/52/61
    Gas Inlet Solenoid Valve Fault/Modulating Solenoid Valve Fault/Combustion Fan Failure 68
    Gas valve wiring/solenoid issues; Fan motor issues.68
    71/72
    Gas Solenoid Valves Circuit Abnormal/Detected False Flame/Thermocouple Circuit Abnormal

V. Resetting Your Rheem Air Conditioner (AC Unit)

When a Rheem air conditioner stops cooling effectively or exhibits unusual behavior, a
simple reset can often resolve minor electrical glitches or communication issues. However, understanding when a reset is appropriate and when it signals a more significant problem is key to maintaining home comfort and avoiding costly repairs. This includes knowing how to use the Rheem AC reset button or the reset button on Rheem air conditioner. If you’re asking, “is there a reset button on a Rheem air conditioner,” the answer is that some models do, while others require a manual power cycle.
A. Locating the Reset Button and When to Reset
Rheem AC units may or may not have a clearly labeled physical reset button. If present, it is typically a small red button located on the outdoor condenser unit, often on the exterior near the bottom edge or sometimes behind a service panel that requires tools to access. Some models might have a reset button on the indoor air handler unit, also known as the Rheem air handler reset button. The Rheem AC unit reset button location can vary. For example, the Rheem RP1436AJ1NA reset button location might be on the outdoor unit.
A manual reset of the AC unit is often recommended as a preliminary troubleshooting step for common issues such as the AC blowing warm air, inconsistent temperatures, or short cycling. The most frequent reason for an AC unit to require a reset is when its internal protection circuit breaker is triggered, often during a power outage or surge, to prevent damage from electrical disturbances. Resetting can also restore communication between the thermostat and the cooling unit if a thermostat error is present. Seasonal startup after a long idle period may also benefit from a reset to clear system errors.
B. Step-by-Step Reset Procedure
The reset procedure for a Rheem AC unit depends on whether a physical reset button is present.
If Your AC Unit Has a Reset Button:

  1. Power Down Your AC. Go to your thermostat and turn the AC system off. Then, locate the circuit breaker in your home’s electrical panel that controls the outdoor AC unit and flip it to the “OFF” position. This prevents the unit from cycling during the reset and protects against electrical shock.
  2. Locate and Press the Reset Button. Go to the outdoor condenser unit. Find the red reset button, typically on the lower edge or behind an access panel. Press and hold the button firmly for 3-5 seconds, then release it. This is the process for the reset button on AC unit outside Rheem.
  3. Restore Power & Restart. Return to the circuit breaker and flip it back to the “ON” position. Wait a few seconds, then turn your thermostat back on and set it to “Cool” at a temperature lower than the current room temperature.
  4. Monitor Operation. Listen for the unit to cycle on and check if cool air is blowing from the vents.
    If Your AC Unit Does NOT Have a Reset Button (Manual Reset):
  5. Power Down Your AC. Turn off the AC system at the thermostat. Then, go to your electrical panel and flip the circuit breaker connected to your HVAC unit to the “OFF” position to fully power it down. Some units may also have an isolation switch near the outdoor condenser unit that should be turned off.
  6. Wait for System to Reset. Allow the system to rest for at least 30 seconds to 1 minute, or up to 30 minutes in some cases, to allow internal pressure to equalize and the control board to fully reset.
  7. Restore Power & Restart. Flip the circuit breaker back to the “ON” position. Wait a few seconds, then turn your thermostat back on and set it to “Cool” at a temperature lower than the current room temperature.
  8. Monitor Operation. Listen for the unit to cycle on and check for cool airflow.
    C. Common Issues and When to Call for Service
    If an AC unit fails to turn on, continues to blow warm air, or exhibits frequent tripping
    of the circuit breaker after a reset, it often indicates more serious mechanical or electrical issues that require professional diagnosis. While a reset can address transient electrical glitches or communication errors, persistent problems suggest underlying component failures. If the Rheem AC unit not turning on after reset, it’s time for a professional.
    Common causes for frequent circuit breaker trips or AC malfunction include:
    ● Dirty Air Filter: A clogged air filter restricts airflow, forcing the blower motor to work harder and draw more electricity, which can trip the breaker.
    ● Dirty Outside Unit (Condenser Coil): If the outdoor unit’s condenser coil is dirty, it cannot effectively disperse heat, causing the AC to run longer and draw excessive current, leading to trips.
    ● Issues with the Circuit Breaker: The problem might be with the circuit breaker itself, such as loose connections or a weak breaker that trips prematurely.
    ● Motor Short: Electrical shorts in the AC’s motors (condenser fan, blower) can cause a sudden surge in current, tripping the breaker. This could involve the Rheem blower motor reset button or issues with the Rheem compressor reset button.
    ● Compressor Issues: The compressor, the “heart” of the AC system, draws significant power during startup. An aging compressor may “hard start” and pull too much current, or a “grounded compressor” (where an electrical winding shorts to the casing) can cause a direct short and trip the breaker. This relates to the Rheem AC compressor reset button or Rheem condenser reset button.
    ● Faulty Capacitors or Relays: Components like run or start capacitors and start relays can fail, preventing the compressor or fan from starting properly.
    ● Low Refrigerant Charge or Leaks: Insufficient refrigerant or a leak can cause the unit to run inefficiently, leading to various operational issues, including freezing coils or short cycling.
    ● Control Board Issues: The main control board regulates power to all components. If it shorts out, it can cause the breaker to trip.
    Rheem AC units also communicate various issues through specific error codes. While normal operation codes include “0” (Standby), “C” (First Stage Cooling), “H” (First Stage Heat Pump), and “D” (Defrost Active) 71, other codes indicate faults:
    ● P (Protector Trip): Compressor operation commanded, but no current measured, indicating an open motor protector.71
    ● 01 (Long Run Time): Compressor running continuously for over 18 hours, suggesting low refrigerant, duct leaks, or dirty filters/coils.71
    ● 02/29 (High Pressure): Dirty outdoor coil, outdoor fan not running, dirty indoor
    coil/filter, liquid line restriction, or excessive refrigerant charge.71
    ● 03 (Short Cycling): Compressor cycles less than 3 minutes, possibly due to thermostat wiring or location.71
    ● L4 (Locked Rotor): Compressor motor is unable to turn.71
    ● 07 (Compressor Open Run Circuit): Current in start circuit but not in Run circuit, indicating capacitor, wiring, or compressor winding issues.71
    ● 09 (Low Secondary Volts): Control transformer overloaded or low line voltage.71
    ● 21 (Low Pressure Control Open): Low refrigerant, frozen outdoor coil, or expansion valve issues.71
    ● 27/28 (Low/High Line Voltage Fault): Issues with incoming power supply.71
    ● 30 (Fuse Open): Blown 3 amp fuse on the control board.71
    ● 80 (Low Air Flow): Indoor unit not providing minimum airflow, possibly due to wrong air mover.71
    ● 83/84 (Condenser Coil/Outdoor Ambient Temperature Fault): Sensor issues.71
    ● 1 (Internal Diagnostic Message): Indicates an abnormal condition in a key monitoring channel, often related to electrical/wiring, sensor failures, control board issues, or environmental factors.
    When these error codes persist, or if the AC unit exhibits loud noises, strange smells, or fails to cool after a reset, it is a clear signal to contact a professional HVAC technician. These symptoms often point to complex problems like refrigerant leaks, compressor failure, or control board malfunctions that require specialized tools and expertise for safe and effective repair.
    Table 3: Common Rheem AC Unit Issues & Solutions
    Issue Type
    Common Causes (DIY Check)
    When to Call a Professional (Signs & Reasons)
    Not Cooling / Warm Air
    Thermostat set incorrectly; Power outage (check breaker); Dirty air filter; Unit unplugged
    Persistent warm air after reset ; Compressor not running ; Refrigerant leak suspected ; Frozen components ; Short cycling.
    Frequent Tripping
    Dirty air filter; Dirty outdoor unit; Weak circuit breaker
    Motor shorted ; Compressor hard starting/grounded ; Faulty run/start capacitor or relay ; Control board issues ; Repeated trips after
    cleaning/checking.
    Unusual Noises/Smells
    Rattling/clinking (loose debris/screws in outdoor unit) ; Musty (mold)
    Hissing/whistling (duct leaks) ; Screeching/banging (serious mechanical issue) ; Burning smell (electrical issue) ; Persistent musty odor (mold requiring professional cleaning).
    Error Codes (e.g., P, 01, 02, 1, 21, 29, 30)
    None (codes indicate internal faults)
    Any error code displayed (except normal operation codes) ; Unit not responding to thermostat.71

VI. Resetting Your Rheem Furnace

A properly functioning furnace is essential for home comfort, especially during colder months. Rheem furnaces incorporate safety features that can cause them to shut down, often indicated by a tripped Rheem furnace reset button or diagnostic error codes. Understanding these signals and knowing when to perform a reset can help restore heat, but it is equally important to recognize when professional service is necessary. This includes models like the Rheem Classic 90 Plus furnace reset button, Rheem Classic 90 Plus reset button, Rheem Classic 90 Plus reset button location, Rheem Criterion II gas furnace reset button, Rheem Criterion II reset button, and Rheem Super Quiet 80 reset button.
A. Locating the Reset Button and When to Reset
All Rheem furnaces are equipped with a reset button, which serves as a critical safety feature designed to protect the system from overheating or other unsafe conditions. This button is typically red or yellow and is most commonly found inside the blower compartment, often located near the blower motor. Accessing it usually requires opening the air handler compartment, which may involve removing screws from a cover panel. In older systems, the button might be harder to locate, sometimes found
underneath or behind the blower motor. If the button is sticking out from the surface, it indicates that it has tripped.3 This answers the question, “
where is the reset button on a Rheem furnace” or “where is the reset button on my Rheem furnace”.
The furnace reset button may trip for several reasons, including overheating, power outages, or issues with the thermostat. Overheating is a common trigger, often caused by clogged filters blocking airflow. A reset can often restore functionality after a minor fault or power interruption.2
B. Step-by-Step Reset Procedure
Performing a furnace reset is a straightforward process, but safety must always be the top priority.

  1. Safety First: Turn Off Power. Begin by turning off the power supply to the furnace. This can usually be done by flipping a dedicated light-style switch located on the side of the furnace unit or on a nearby wall. Additionally, locate the corresponding circuit breaker in your home’s electrical panel and switch it to the “OFF” position.
  2. Wait for System to Power Down. Allow the furnace to fully power down for a few minutes (typically 30 seconds to 5 minutes). This allows the control board to clear any transient errors and internal components to cool.
  3. Locate and Press the Reset Button. Open the blower compartment access panel (be cautious, as the area may be hot if overheating was the cause).9 Locate the red or yellow reset button. If it is popped out, press it in firmly once. It is crucial to avoid pressing the button repeatedly, as this can cause it to get stuck or damage the system. This is how you use the reset button on Rheem furnace.
  4. Restore Power & Monitor. Replace the blower compartment cover, ensuring it is securely closed (some furnaces will not operate if the panel is open).26 Return to the circuit breaker and flip it back to the “ON” position. Then, turn the furnace power switch back on. Set your thermostat to “Heat” and adjust the temperature a few degrees higher than the current room temperature to call for heat.11
  5. Observe Operation. Listen for the furnace to start its ignition sequence and observe if it begins heating properly.
    C. Common Issues and When to Call for Service
    If a Rheem furnace continues to trip the reset button, fails to ignite after a reset, or displays persistent error codes, it indicates a chronic defect or a more serious underlying problem that requires professional attention. Repeatedly resetting the furnace without addressing the root cause can lead to increased energy costs, a shortened lifespan for the unit, and potential safety hazards, including electrical fires. If the Rheem furnace reset button not working or the Rheem furnace not igniting after reset, professional help is needed.
    Common reasons for furnace malfunction or frequent tripping include:
    ● Overheating: This is the most common reason for a tripped reset button. It occurs when insufficient cold air enters the system, trapping heat inside the unit.3 Causes of overheating include:
    ○ Dirty Air Filters: Clogged air filters are a primary cause of reduced airflow and overheating. Regular replacement (monthly to quarterly) is crucial.
    ○ Obstructed Supply/Return Vents: Blocked or closed supply registers and return air vents can also restrict airflow, forcing the furnace to work harder.3
    ● Electrical Issues: Loose connections, damaged wiring, or other electrical problems can cause shorts or overloads, leading to the reset button tripping or the circuit breaker activating. A faulty control board can also cause tripping. This can also be related to the Rheem electric furnace reset button location.
    ● Loss of Fuel/Blocked Gas Valves: For gas furnaces, a tripped reset button can indicate a lack of fuel or accidentally closed gas valves. Blocked gas valves or issues with the gas supply can prevent ignition.65 This relates to the Rheem gas furnace reset button and Rheem gas furnace reset button location.
    ● Dirty Flame Sensor: A flame sensor rod coated with dirt or debris may fail to detect the flame, causing the furnace to shut off as a safety measure.
    ● Aging Furnace: If a furnace is nearing the end of its lifespan (typically 15-20 years), frequent tripping can signal significant wear and tear and struggling efficiency, often making replacement a more cost-effective solution than repeated repairs.3
    Rheem furnaces often feature a diagnostic LED light or an LCD screen that displays
    specific error codes, providing valuable clues about the problem.
    Normal Operation Codes:
    ● 0: Standby mode – furnace is ready and waiting for a command. This is the Rheem furnace code 0 reset button meaning.
    ● cd: Dehumidifier on.62
    ● dF: Defrosting – normal operation.62
    ● F: Continuous fan.62
    ● H: Heating active or calibrating.62
    Common Issues Requiring Simple Fixes (often related to airflow or communication):
    ● d1: No shared data – communication issue between furnace and thermostat.62
    ● 11, 12, 13: Ignition or flame-related issues (ignition failure, low flame detection, flame lost).62 Cleaning the flame sensor or checking gas supply might help.65
    ● 45/46: Low-pressure switch open – air intake system obstructed.64
    Codes That May Require Professional Assistance (often indicating serious internal faults):
    ● 10: One-hour lockout – temporary shutdown due to repeated ignition failures.62 A reset might temporarily work, but a technician is needed for the root cause.62
    ● 26: Line and neutral reversed – incorrect electrical polarity, a significant safety risk.62
    ● 93: Internal or control board fault.62
    ● 22/23: Main or heat assist limit open – furnace overheating, often due to insufficient airflow.62
    ● 14: Unexpected flame – potential fire hazard, requiring immediate shutdown and professional call.62
    ● 60, 61, 66, 68: Blower-related faults (motor running too fast, failing to run).62 This relates to the Rheem blower motor reset button.
    ● 77/78: Gas valve communication or servo faults.62
    If the furnace reset button keeps tripping, or if the unit fails to ignite after a reset despite checking basic airflow and fuel supply, it is crucial to contact a qualified HVAC technician. Issues like dirty burners, gas valve malfunctions, persistent flame sensor problems, or control board failures often require specialized diagnostic tools and expertise.
    Table 4: Common Rheem Furnace Issues & Solutions
    Issue Type
    Common Causes (DIY Check)
    When to Call a Professional (Signs & Reasons)
    No Heat / Frequent Trips
    Dirty air filter ; Obstructed supply/return vents 3; Pilot light out (gas furnaces) ; Thermostat settings.
    Reset button keeps tripping ; Furnace not igniting after reset 65; Electrical issues (burning smell, visible damage) ; Gas leak suspected 16; Strange noises 3; Old furnace (nearing end of lifespan).3
    Overheating
    Dirty air filters ; Obstructed vents 3; Dirty flame sensor.
    Persistent overheating (Code 22/23) 62; Limit switch issues 64; Blower motor issues.
    Ignition Issues
    Gas supply off/low ; Dirty flame sensor ; Obstructed flue/air intake.64
    Faulty igniter 61; Gas valve not opening (no 24V to valve) 65; Control board malfunction ; Persistent ignition failure (Code 11, 12, 13, 10).62
    Error Codes (e.g., 10, 26, 93, 60, 77)
    None (codes indicate internal faults)
    Any error code indicating a lockout, electrical fault, control board issue, or blower/gas valve malfunction 62; Unit not responding to thermostat.62

VII. Conclusion and Recommendations

Maintaining Rheem HVAC and plumbing appliances requires a combination of informed homeowner troubleshooting and timely professional service. This guide provides the necessary steps for safely resetting common Rheem appliances, including Rheem electric water heater reset button, Rheem gas water heater reset button, Rheem tankless water heater reset button, Rheem AC reset button,
and Rheem furnace reset button. It emphasizes that while a reset can often resolve minor, transient issues such as those caused by power fluctuations or simple communication errors, it is crucial to recognize that the reset button primarily functions as a safety mechanism.1 A tripped reset button frequently signals an underlying problem, such as overheating due to component failure, electrical issues, or airflow restrictions.
For homeowners, the key takeaway is to always prioritize safety by ensuring power, gas, and water supplies are disengaged before any inspection or reset attempt.4 Consulting the appliance’s specific owner’s manual is also highly recommended, as procedures and component locations can vary by model.6
When a reset does not resolve the issue, or if the problem recurs frequently, it is a clear indicator that professional assistance is needed. Symptoms such as a reset button that won’t click or stays tripped , persistent electrical issues 1, gas odors 16, significant water leaks 7, unusual noises or smells 3, or physical damage 1 all warrant immediate professional intervention.
For residents around Steubenville, Ohio, including communities like Weirton, WV, choosing a Rheem Pro Partner ensures access to highly trained and vetted professionals. This partnership provides homeowners with exclusive benefits, including priority service, special financing offers, and the assurance that their technicians are continuously updated on Rheem’s latest technologies and repair protocols.77 This commitment to expertise and customer satisfaction translates into reliable, long-lasting solutions for all Rheem appliance needs. For complex diagnostics, repairs, or considerations for replacement, contacting a local Rheem Pro Partner is the most effective way to restore home comfort and ensure the longevity and safety of your Rheem systems.
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