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Lennox Air Conditioner Troubleshooting - PartsAPS

lennox air conditioner troubleshooting

Is your Lennox air conditioner not operating correctly? Follow this Lennox air conditioner troubleshooting guide before calling a professional for service. Troubleshooting your Lennox AC is actually much simpler. This blog highlights a few common Lennox AC issues and solutions so you can get your unit back up and running.

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Lennox Air Conditioner Troubleshooting Guide

Here are some simple tips to solve your Lennox AC problems.

Lennox AC Makes Noise

If your air conditioner is loud, check the following components to fix the issue.

Fan motor

In many older units, fan motor failure might be common. So, if your unit is old, first, you should check the fan motor. The bearings will wear out over long time usage. So, replace the motor rather than the whole unit.

This is also one of the components that may wear out after a long time of usage. When it failed, it makes some noise. Hence, check and fix the problem of the compressor if it has.

Fan blade

Check if the blade is loose. Also, you have to verify that there are any obstructions in the fan blade. Remove them. If it is loosened, tight it. Make sure you don't put off the unit looked at when it starts to get noisy.

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Unit Stops Pushing Out Cool Air

Defective compressor

Generally, the compressor consists of series of coils and the pump that circulates the refrigerant in your air conditioner. If any of these components fail, it could cause the compressor to damage.

Power cut off to the AC

If you observe the power supply, there may be fuses or breakers in between the house circuit and the condensing unit. Sometimes they will disconnect. So, check and reconnect them properly. If there is broken fuses or circuit breaker, you have to replace.

To meet the optimum temperature, the thermostat controls how long the air conditioner runs. This is managed to accomplish in most units by contacts used to open and close circuits. The air conditioner does not know when to operate if the contacts fail. You can replace the old thermostat with a new one if required.

Lennox Air Conditioner Won't Turn ON

If your unit is not running, first you have to check your AC outside to determine if the condenser is running. Also, ensure that the air conditioning unit is plugged in and the thermostat is set correctly. Check if the problem will fix by lowering the thermostat setting 5 to 10 degrees. Moreover, the thermostat should be set to cool mode.

After that, you have to verify whether there is a blown fuse or tripped circuit breaker. If still the problem persists and your coil is frozen, the problem might be with your compressor or motor. You can contact a professional to repair your Lennox air conditioner.

Lennox Air Conditioner Not Cooling

If your unit is turned on and the thermostat is set properly, but your Lennox AC is not cooling, then there may be a dirty or blocked air condenser. So, the first step you need to do is check the outside of the unit. Make sure to clean around it and remove if any debris that is blocking air circulation.

Once you have removed or cleaned debris, you have to check the air filter and make sure it is clean. Usually, many times we will see the filter is dirty and when it restricts the air to the evaporator coil, the coil will freeze. You need to change your air filter frequently when you have pets or use the unit often. Even after replacing the filter, the AC is not cooling air, compressor or refrigerant might be caused for this problem.

If your AC is not adequately cooling home, then consider that unit is not sized appropriately in your home. Make sure that your AC is sized to keep your home cool on the summer day. The average system must be able to maintain a 20 to 25-degree temperature difference between the indoor and outdoor temperatures.

How to Replace Air Filter?

It is important to replace the filter in your air conditioner. If you change the air filter frequently, your unit works without any unnecessary stress from trying to push air through dirt and debris. To replace, follow the below steps:

  • First, find your air filter. You can find that in the furnace, AC, or the return duct.
  • Next, turn off the power to the unit before removing the filter.
  • Remove the air filter out. Now, you can clean or replace it.
  • While replacing, you should take care to make sure that the arrows indicating airflow match up with how air is blowing through your air conditioner.
  • Once a replacement has been done, place the panel back and close the unit.
  • Turn the power ON to the unit.

Lennox air conditioner error codes indicate you when your unit needs to repair or is not working as it should. Each error code has a separate meaning that helps you to identify the Lennox AC issues easily. If any error code occurs on the board, you have to turn off the AC and contact professional if necessary.

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Final Words:-

As a homeowner, there are few common maintenance tasks that you have to do to ensure that your Lennox AC works in top condition. So, use our Lennox AC unit troubleshooting guide when you want to fix the common issues yourself. For more specified instructions on Lennox air conditioner repair, check the Lennox troubleshooting manual. Moreover, PartsAPS provides you Lennox air conditioner parts for replacement needs. Look at our in-stock Lennoxparts and order online!

About the Author


Haritha is a Content Writer at PartsAPS. She has a great understanding of today's marketing strategies that yield strong results and always happy to create valuable content & share her thoughts.

She was good at writing content for E-Commerce websites related to Restaurant Equipment Parts, Appliance Parts, Food Service Parts, HVAC Parts, etc.

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