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How To Reset Lennox AC Unit

Large Lennox Ac Unit Located On The Roof.
Large Lennox AC Unit Located on the Roof

The most unfortunate thing that can happen to you is if your Air Conditioner stops working on a hot summer day and you do not have a budget for its repair.

Even if you opt for the latest model with all the fancy features, your AC can malfunction and stop performing without any reason.

The best thing to do before getting professional help is to reset it.

Lennox is a renowned Air Conditioner brand that has offered high-quality products since 1952.

If you are searching for a reset button on the AC Unit, stop doing that as Lenox Air Conditioners do not have a reset button, and you need to reset them if needed manually, but the question is how?


There are two ways to reset your Lennox AC unit, but the most straightforward method involves only three easy steps.

  1. Switch off the thermostat and Air Conditioner by turning off their switches.
  2. Locate the circuit breaker connected to your Air Conditioner and turn it off for 60 seconds.
  3. After waiting a minute, turn off the circuit breaker and the Air Conditioner to see if it works well.

Read further if you want to learn different ways to reset your Lennox AC unit.

2 Ways To Reset Your Lennox AC Unit

There are two ways to reset your Lennox Air Conditioner; the first method is easier and does not require a particular skill.

However, the other method requires knowledge of the AC unit and opening its back panel. So choose the method wisely according to your convenience.

Method #1: Resetting via Circuit Breaker

The simple way to reset your Lennox AC Unit is by switching off the unit and the circuit breaker.

  1. Start by turning off the thermostat and then the air conditioning unit.
  2. You can look for the circuit breaker connecting to your AC. Mostly these are found in closets, basements, or crawl spaces.
  3. Keep it turned off for 1 minute.
  4. After a minute, the AC will automatically reset. You can turn it on and check if its performance gets better.

Method #2: Resetting via Pressure Switch

As mentioned earlier, the Lennox AC units don’t have a reset button, but they have a pressure switch that can help to reset the unit.

  1. Start by turning off the air conditioner and associated circuit breaker.
  2. Remove the back panel of the unit.
  3. Once you have removed the back panel, locate the copper line ( liquid line ) at the bottom of the unit.
  4. You will see a red rubber push switch next to the line. Press it to reset the pressure switch.
  5. If you notice a yellow line repeatedly blinking after resetting the pressure switch, contact an expert, as it indicates some other serious issue with your appliance.


A perfectly working AC unit keeps you more relaxed and refreshed in summer.

If resetting your Lennox unit doesn’t improve the performance, it is better to call a professional.

Do not try to self-diagnose the issue, as it can cause further harm to the appliance.

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