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How To Troubleshoot A Lennox Air Conditioner And Where To Find The Reset Button

How To Troubleshoot A Lennox Air Conditioner And Where To Find The Reset Button

The Lennox air conditioner is one component that is frequently used yet occasionally has to be reset. Do not worry if you are unclear of how to correctly reset your device. Below are detailed instructions.

Follow these precise directions to reset your Lennox air conditioner:

  1. Switch on the “off” setting on your thermostat.
  2. Locate and shut off the circuit breaker for the air conditioner.
  3. Patiently wait for about 30 minutes.
  4. Reinsert the circuit breaker.
  5. Reset the thermostat to the “on” position.

On your Lennox AC unit, where is the reset or circuit breaker located?

Here’s how to locate it and utilize it:

  1. How to find the breaker box
    • Seek out a metal box, which may be square or rectangular in shape and size.
    • Typical locations to look for it are the garage, utility room, basement, and exterior of the home.
    • In an apartment, it can be in a hallway, utility closet, or similar spot that is simple to get to.
  2. Crack the Box
    • The circuit breakers should be accessible through the front door of the box, which should have one.
  3. Discover the AC breakers
    • There are multiple switches inside the box, most of which have labels.
    • Seek one with the designation “AC” or “Air Conditioner.”
    • If the breakers aren’t labeled, you might have to figure out which one controls the AC by trial and error or by studying which breakers are in charge of certain areas of your home.
  4. Toss the switch
    • After you have located the proper breaker, turn it to the “off” position.
    • Hold out for a little amount of time, typically between 30 and several minutes.
    • Reset the breaker so that it is in the “on” position.

Now, you might be wondering if there is a physical reset button. Well, not all air conditioners have one.

If your Lennox AC unit has a reset button, it is typically located on the outdoor unit and labeled as the “Reset” button.

If you are having trouble finding it, consult your user manual for specific information on its location.

If you cannot find a reset button, it is likely that your unit does not have one, and you can perform the reset process using the circuit breaker method described above.

Is It Really Necessary To Reset Your Lennox Air Conditioner?

How To Troubleshoot A Lennox Air Conditioner And Where To Find The Reset Button

For a variety of reasons, you might need to reset it. In this post, the reset process will be described along with an explanation of its purpose. For answers to more frequently asked questions regarding Lennox air conditioners, keep reading.

Information About Resetting The Lennox Air Conditioner In More Detail

In order for an air conditioner to work, warm air must be removed from the room, chilled, and then reinserted. This procedure is carried out repeatedly until the target temperature is attained.

These gadgets are commonly seen in households across the nation. Like any gadget, they are however prone to problems that necessitate a reset.

You might need to reset your Lennox air conditioner for a number of reasons. A few of these are:

  1. The house is not being cooled by your Lennox air conditioner, and it is too noisy.
  2. The gadget is broken since a circuit breaker tripped it.
  3. The apparatus is broken, and water is dripping from it.
  4. The air conditioner needs to be revived because it hasn’t been used in a long.
  5. You want to turn on the thermostatic device that was previously off.
  6. Your Lennox air conditioner won’t even turn on for unidentified reasons.

If you see an error message or If the Lennox air conditioner needs to be reset because the unit isn’t working properly, the problem might be fixed. To do this, adhere to following steps:

  1. Start by turning off the AC unit using the thermostat.
  2. Locate the circuit breaker that supplies power to the Lennox air conditioner.
  3. Turn off the breaker for at least 30 seconds before switching it back on.
  4. Once the breaker is back on, use the thermostat to turn the AC unit back on.

If you continue to experience problems with your Lennox air conditioner, it is advisable to seek assistance from an HVAC specialist.

Where Is The Reset Button On A Lennox Air Conditioning Unit?

Technically, the Lennox air conditioner does not have a “reset switch.” However, it does have a pressure switch that can be reset to restart the system.

To perform this reset, follow these steps:

  1. First, turn off the power to the unit by switching off the breaker associated with the air conditioner.
  2. Next, remove the back panel of the unit.
  3. Once the back panel is removed, locate the liquid line (copper line) at the bottom of the unit.
  4. On the liquid line, you will find a red rubber push switch. Press this switch to reset the pressure switch.

If this procedure does not resolve the problem and you notice a yellow light flashing multiple times, it indicates another underlying issue.

Why Doesn’t My Lennox AC Work?

It can be uncomfortable if your Lennox air conditioner isn’t running properly. To find and fix the issue, though, you can look at a variety of possibilities. Check them out below:

How To Troubleshoot A Lennox Air Conditioner And Where To Find The Reset Button
  1. Air filter Clog
    • In order to solve this problem, clean or replace the air filter.
    • To avoid AC issues, routine maintenance is required, such as changing the filter at least once every 30 days. If this is ignored, the AC system might not work properly.
  2. Faulty Thermostat
    • A broken or incorrectly calibrated thermostat may be the cause of an AC unit problem.
    • The thermostat might be at blame if your house isn’t cooling off or if you see unusual error codes.
  3. Tripped Circuit Breaker
    • If the circuit breaker associated with the Lennox AC unit keeps tripping, there may be an issue with the motor.
    • Simply turning off and resetting the breaker should resolve the problem, as it resolves any power surges.
  4. Dirty Condenser Coils
    • Over time, condenser coils can accumulate dust and dirt, potentially affecting the unit’s performance.
    • Cleaning the coils using a vacuum cleaner or coil cleaning brush can resolve this issue.
  5. Faulty Compressor
    • Freezing or frosting of coils indicates a faulty compressor.
    • In such cases, it is best to contact an HVAC specialist for further assistance.
  6. Failing Control Board
    • The internal control board in the Lennox AC unit manages all functions, particularly powering the compressor and fan.
    • If this board fails, it will need to be replaced.
  7. Defective Temperature Control Board
    • The temperature control board regulates the unit’s temperature.
    • Before replacing the temperature control board, check other components, as they can sometimes be misdiagnosed.
  8. Faulty Temperature Control Thermostat
    • If the internal board is functioning correctly but the cooling is inadequate, a faulty temperature control thermostat may be the cause.
    • Replacing the thermostat may resolve the issue.
  9. Malfunctioning Thermistor
    • If the thermistor fails, the air conditioner may not be able to cool effectively.
    • In such cases, the thermistor should be replaced.
  10. Input Power Failure
    • An input power failure occurs when the unit is not receiving electricity properly.
    • Contact your utility company to report this issue or seek assistance from an HVAC professional.
  11. Blown Blower Motor
    • A blown blower motor should be replaced promptly to prevent further damage to other parts, such as the compressor and fan.
    • This typically happens due to power surges or extended usage.
  12. Faulty Condenser Fan Motor
    • A faulty condenser fan motor needs immediate replacement.
    • A damaged blower wheel can cause additional problems in the unit, and the motor may overheat, leading to compressor and internal board issues.
  13. Defective Run Capacitor
    • The run capacitor supplies power to specific parts of the unit and controls its functions.
    • If the run capacitor fails, it should be replaced.
  14. Faulty Fan Blade
    • A loose fan blade can create a noticeable rattling noise during operation and must be replaced.
    • If the blades are clogged with dirt or debris, it can affect the unit’s performance and cause the motor to overheat.
    • If the blower wheel is ripped or missing pieces, it can lead to overheating and subsequent compressor and internal board problems.

Lennox HVAC systems are generally reliable when properly maintained. Regular check-ups and prompt resolution of any issues are essential to ensure optimal performance. If you encounter any problems with your Lennox AC unit, it is advisable to contact a Lennox HVAC professional for assistance.

What Is The Average Life Of A Lennox Air Conditioner?

How To Troubleshoot A Lennox Air Conditioner And Where To Find The Reset Button

Lennox air conditioners are renowned for their reliability and long lifespan. On average, these units can last between 15 to 20 years under normal circumstances. However, some homeowners choose to replace them earlier, around the 12-year mark, to upgrade to more efficient and powerful models.


While Lennox AC units are generally reliable, occasional issues may arise that require attention. Fortunately, most common problems are easy to fix and do not require significant time or effort. Start by resetting the unit and checking various components as outlined in this article. If the issue persists, consult an HVAC specialist for professional assistance.

How To Troubleshoot A Lennox Air Conditioner And Where To Find The Reset Button

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