How To Reset Lennox Air Conditioner

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The Lennox air conditioner is a popular unit on the market, but like any appliance, there may be a time you need to reset the system. So, what steps do you need to go through to reset it correctly? Not to worry, we have laid out each step for you below.

To reset your Lennox air conditioner, follow these steps:

  1. First, turn off the air conditioning unit on your thermostat.
  2. Next, locate your circuit breaker and find the breaker that controls your Lennox air conditioner.
  3. Now, reset the breaker.
  4. Wait a minimum of 30 seconds before turning the breaker back on.
  5. Lastly, turn your air conditioning on using the thermostat.

There are several reasons why you will need to reset your Lennox air conditioner. This article will discuss how to reset your system and why you will need to do so. In addition, we will answer other frequently asked questions about the Lennox air conditioner, so read on!

Large air conditioning engine located on the roof, How To Reset Lennox Air Conditioner

How To Reset Lennox Air Conditioner

A home air conditioner works by drawing in warm air from the room, cooling it, and releasing it back into the room. The process is repeated repeatedly until the desired temperature is reached.

These units are very common in households across the country. However, like any appliances, they can malfunction, requiring a reset.

There are many reasons why you may need to reset your Lennox air conditioner. A few of these include:

  • Your Lennox air conditioner is making a loud noise and not cooling your home.
  • A breaker kicked to the unit for one reason or another.
  • The unit is leaking water and the equipment malfunctions.
  • You haven't used the air conditioner in some time, and you want to activate it again.
  • You turned the device off at the thermostat, but you would like to turn it back on.
  • Your Lennox air conditioner is not turning on at all for some reason.

If you are experiencing an error code or the unit isn't running properly, resetting the Lennox air conditioner may correct it.

You can do this by following these steps:

  1. First, turn off the AC unit on the thermostat.
  2. Now, you will need to locate the circuit breaker that controls the power to the Lennox air conditioner.
  3. Turn that breaker off for a minimum of 30 seconds before turning it back on.
  4. Once the breaker is turned back on, you can now turn the AC back on using the thermostat.

If you are still having issues with your Lennox air conditioner, it is good to reach out to an HVAC specialist for further assistance.

Lennox corporation trademark logo and trademark

Where is the reset button on a Lennox air conditioning unit?

Technically, the Lennox air conditioner doesn't have a "reset switch." However, it does have a pressure switch that you can reset to restart the system.

To do this, you will need to first turn off the power to the unit by turning off the breaker associated with the air conditioner. Next, you will need to remove the back panel on the unit.

Once you have removed the back panel, locate the liquid line [copper line] at the bottom of the unit. Once you locate the liquid line, you will see a red rubber push switch. Press that switch to reset the pressure switch.

If this doesn't solve the problem, and you see a yellow light flashing several times, then this indicates you have another problem.

Why is my Lennox AC not working?

If your Lennox AC unit isn't working, it can be worrisome. However, there are some areas you can troubleshoot to solve the problem. Let's take a look at them below:

Clogged Air Filter

You will need to clean and replace the air filter to solve this problem. This should be done at least once every 30 days to prevent any issues with your unit. If you forget or neglect to do so, the AC could stop working.

Defective Thermostat

Replacing an old thermostat with a new one

If the thermostat gets damaged or if it is not calibrated correctly, then the unit may stop working. If you notice that your home isn't cooling down or noticing strange error codes, then the thermostat might be the issue.

Reset Circuit Breaker

Technician checking the breaker box for any circuit breaks

If you notice that the circuit breaker associated with the Lennox AC unit keeps tripping, this could be due to an issue with the motor.

The easiest way to resolve this problem is to turn off and reset the breaker. The air conditioner should now work correctly. If there was a power surge, it has now been resolved.

Dirty Condenser Coils

Condenser coil full of dirt and grass debris

The condenser coils collect dust and dirt over time.

If you notice that your Lennox AC unit is not working correctly, this could be the issue. To resolve it, you will need to clean out these coils. You can do this by using a vacuum cleaner or using a coil cleaning brush.

Bad Compressor

If you notice that your Lennox AC is freezing up or that the coils are frosting over, this probably means that the unit has a bad compressor. If so, you will need to call an HVAC specialist for further assistance.

Failing Control Board

Air conditioner control board assembly parts

The Lennox AC has an internal control board that controls all unit functions. The most crucial part is sending power to the compressor and fan. If this board fails, then it will need to be replaced.

Defective Temperature Control Board

The temperature control board is responsible for controlling the temperature of your Lennox AC unit. If this fails, this could also be why your unit isn't working correctly. Therefore, it is good to check other parts before replacing the temperature control board because they are misdiagnosed.

Faulty Temperature Control Thermostat

If the internal board is working, but you notice it isn't cooling correctly, it could be due to a faulty temperature control thermostat. If so, then replacing may solve the issue.

Bad Thermistor

If the thermistor fails, then your air conditioner may not be able to cool properly. If this occurs, you will need to replace it with a new one.

Input Power Failure

An input power failure means that the unit has not been receiving electricity properly. If this happens, you will need to report it to your utility company, or an HVAC professional can also resolve it.

Blown Blower Motor

If your blower motor is blown, it will need to be replaced as soon as possible since it can affect other unit parts, like the compressor and fan. This could lead to more damage that requires extensive repairs. However, this should only happen if there was a power surge or used for an extended period of time.

Bad Condenser Fan Motor

A bad condenser fan will need to be replaced as soon as possible. The blower wheel can also cause other problems in the unit if this occurs. The blower fan can also give off a burning smell, which means that you will need to replace it as soon as possible.

If the blower wheel has ripped or is missing pieces, this can also affect how your Lennox AC unit works. For example, it might overheat, leading to other compressor and internal board problems.

Bad Run Capacitor

Air conditioner repair by technician. The technician replace the capacity run of air conditioner. Hand holding the capacitor run

The run capacitor sends power to certain parts of the unit and controls its functions, such as cooling and heating. If this part fails, you will need to replace it with a new one. It's also important not to make

Faulty Fan Blade

If the fan blade is loose, it could create a rattling noise that is noticeable when running, which will need to be replaced immediately. If the blades are clogged with dirt or debris, this could also affect how well it works. Finally, the motor might overheat, which can cause major damage to the entire unit.

Repairman works on air conditioner horizontal shot

Is Lennox HVAC reliable?

Lennox air conditioners are known for their reliability when adequately maintained.

Since so many parts could cause an issue, it's very important to have them checked regularly for any problems. If you notice a problem with your Lennox AC unit, you will need to contact a Lennox HVAC professional as soon as possible.

What is the average life of a Lennox air conditioner?

Lennox ACs are known for their reliability and long life.

The average lifespan is around 15-20 years, which is what it takes to get a new Lennox AC unit under normal circumstances. However, some homeowners choose to replace them before the 12-year mark to upgrade to a more efficient and powerful model.

HVAC air conditioning unit on concrete slap with new construction brick house

Final Thoughts

High efficiency modern air conditioner outside the house, How To Reset Lennox Air Conditioner

While Lennox ACs are known for their reliability, some occasional issues might need to be resolved for them to work correctly.

However, the most common problems with these units are relatively easy to fix and should not take long to resolve. The first step is resetting your unit and checking other parts, as mentioned in this article.

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