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5 Reasons Why Your Air Conditioner Turns Off By Itself

A man sitting on a couch in front of a fan.

On a sweltering day, many of us put tremendous faith in our cooling systems, hoping they will keep us comfortable. So if it seems like your air conditioner is struggling to complete a normal cooling cycle, it can be easy to worry.

Unfortunately, short cycling is one of the most common AC problems that homeowners can experience. There can be many reasons why your air conditioner turns off by itself, so it may take some troubleshooting before you understand what course of action needs to be taken.

Let’s discuss some potential reasons why your AC keeps shutting off.

Frozen Evaporator Coils

If your AC keeps shutting off and you don’t know why, consider turning your attention to the unit’s evaporator coils. These play a prominent role in air conditioning systems but, unfortunately, if they become frozen, it can cause your air conditioner to turn off unexpectedly.

Use this guide to find out what can cause evaporator coils to develop a layer of ice:

A dirty air filter can contribute to insufficient airflow coming and going from your AC unit. The coils can freeze as a result.
What Causes 

 Evaporator Coils?
Low airflow can cause many issues for your AC system, including frozen evaporator coils. Don't ignore this problem!
Low refrigerant levels can also cause the evaporator coils to freeze. You'll want to address low or leaking refrigerant ASAP.
If the evaporator coils are dirty, this can lead to them freezing. You can clean the coils to prevent dirt and debris buildup.

Dirty Air Filters

The air filter in your AC system has an important job in that it’s responsible for collecting airborne contaminants. When this filter is clean, it will help prevent harmful pollutants from getting recirculated into your home.

However, if this filter is dirty or clogged, it can spell many problems for your cooling system and your comfort. In fact, a clogged air filter could be one of the reasons why your air conditioner turns off by itself.

Dirty air filters can restrict the airflow coming and going from the AC unit. The air conditioner will need to work harder to overcome this obstacle, which can result in higher energy bills and short cycling. The equipment in your AC unit can also experience excessive wear and tear, which can lead to costly repairs or a replacement.

Thermostat Problems

If your AC keeps shutting off, your instinct is probably to blame the air conditioner for the problem. However, your thermostat could actually be to blame instead. If your thermostat is located in a cooler part of your home, the AC unit may shut off too soon, thinking that it’s completed its job in cooling your home. A professional technician can help you move the thermostat to a more suitable location.

Oversized AC Unit

Did you know that an oversized unit could be one of the reasons why your air conditioner turns off by itself? It’s crucial for homeowners to ensure their air conditioning units are appropriately sized for their homes. Installing a system that’s too big or too small can lead to several problems, including short cycling.

For instance, if the unit is too big, it will end up cooling your home too quickly. The unit will shut off as a result, stopping in the middle of a refrigerant cycle. You may also find yourself paying for sudden AC repairs, as this frequent stop-start cycle can put excess stress on the unit.

Malfunctioning Run Capacitor

Air conditioners have a critical component known as the “run capacitor,” which is responsible for giving the cooling system the energy it needs to start operating. Unfortunately, the run capacitor can fail over time. As you can imagine, this problem could be why your AC keeps shutting off. Your air conditioner will only get the power it needs to keep running at sporadic times.

Trust Polar Bear With Your Cooling Needs

It’s plain to see that there are many potential reasons why your air conditioner turns off by itself. The problem may be simple to fix, such as a dirty air filter. However, if you’re experiencing an electrical problem or a refrigerant leak, it’s vital to call a professional technician for help as soon as possible.

At Polar Bear Air Conditioning, you can count on us to provide trustworthy AC repair in Grand Cayman. We also offer many other services, such as annual maintenance, to ensure your system’s refrigerant levels are normal and components are looking their best. So whether you need a quick fix or a new AC condenser unit, we’re here to help.

Contact us today to request an appointment with our friendly and experienced team!


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John Thistle
John Thistle
21:32 17 May 23
I recently had my air conditioning unit installed by Polar Bear Air Conditioning in Cayman Kai. I was very pleased with the service I received. The workmen, Jerome, Tony, and Nathan, were all professional and courteous. They arrived on time and were dressed in their uniforms. They laid out carpeting where they would be walking inside the house to avoid leaving debris or making a mess. They worked clean and kept the space tidy. They were polite and provided me a good understanding of the work they completed as well as showed me all pieces of equipment. They emailed me a jpg image of each piece of equipment's information plate so that I could record it in my home management software, as requested.Here are some specific details about the work they did:They installed 3 new high-efficiency air conditioning units that are much more energy-efficient (26 SEER) than my old units.They cleaned and disinfected the air ducts, as well as replaced previously installed flex ducts with rigid duct work that is superior in efficiency and durability.They installed new filters to help keep the air clean and free of allergens.They explained the operation of the new units to me and answered all of my questions.They cleaned up after themselves and left my home in good condition.I would highly recommend Polar Bear Air Conditioning to anyone in need of air conditioning installation or service. They are a professional and reliable company that provides excellent customer service.
Charles Mobley
Charles Mobley
01:19 01 May 23
Our ac stopped working a few weeks ago and Polar Bear sent Roemaine and Tyrone to diagnose the problem. Roemaine and Tyrone very quickly identified the problem and communicated with me. It turns out the best option was replacing the condensing unit which Paul quoted within a matter of minutes and they had expert installation team (Tony and Jerome) complete late in the afternoon with short notice. I’m very happy with their work!
17:26 22 Feb 23
I have, over the years been trying to find a reliable, professional A/C maintenance and repair company. I have tried a few. That search is now over after using Polar Bear. Billy and Jerry were absolutely a pleasure to work with. Knowledgeable and professional from the initial diagnosis to the final repair. I highly recommend this company and the team that came to do work on my AC. Tim.
Gill Gordon
Gill Gordon
01:58 27 Jan 23
Polar Bear technicians are always very polite, friendly and professional in their service. Each of their technicians that we have dealt with have been great and they are always super responsive to getting someone out. Pictured are Antony and Billy who completed our recent service 👍
Zichri M.
Zichri M.
22:27 30 Dec 22
Great work. I received an email and also a call from the dispatcher that the tech would be calling me, and sure enough, the tech (Simon) called shortly after that to let me know he was on his way which was very much appreciated. The customer service from all of the team and updates was spot on, and Simon was very thorough and very knowledgeable. He was also very courteous and professional. I rate Polar Bear as the best company in town. Great work!
Glenroy Miller
Glenroy Miller
03:27 24 Dec 22
Tyrone is very knowledgeable and professional, he gave me a step by step update of what he was doing. He also gave advice on how best to protect not only the unit but my family. My wife and I are totally satisfied with the service.
Kyle Roberts
Kyle Roberts
22:50 23 Dec 22
Polar Bear's service and response was amazing! Nicole who answered my phone call and scheduled me was extremely friendly, accommodating and knowledgeable! The Technician assigned to me was Simon and he was also extremely friendly and very knowledgeable. Within a minute of looking at my system he knew what the errors and issues were! He was able to fix one of the two problems that day, and then came scheduled and came the following day to fix the remaining issue. He was perfectly on time and the courtesy call before arrival both times before arriving was a welcome touch as it made sure that I was ready.Will continue using polar bear for all my HVAC needs! 5*
Kayla Shibli
Kayla Shibli
01:09 05 Oct 22
My experience with Polar Bear has been awesome!!!! From the beginning, the office staff were so professional and kind, then receiving my AC quote, the gentleman has been very prompt in his response time—, the kind of employee that puts customer first and has such a nice and an approachable attitude, very patient in answering my questions and providing guidance as required by me- customer focus completely, then as if that wasn’t enough to convince me to move my AC maintenance and installation to Polar Bear; the technicians that attended to my AC installation provided such excellent service— what stood out was how they used a carpet that was placed on my floor to avoid making any mess on my floor and whatever mess they did make, the technician used their broom to remove it. I know this message is long but I really wanted to express my THANK YOU and appreciation for such excellent customer service that I’ve experienced by Polar Bear — you have won me as a customer!! THANK YOU! Keep up the excellent customer service!!! Looking forward to building a relationship with you as a new customer.
Robert L White
Robert L White
11:48 15 Aug 22
Olivia and Demitri very professional , competent and are delightful people! She came by and diagnosed some issues with our AC system . I am reviewing your estimate at this time..I truly enjoyed meeting them. They both real assets to your Company!Rob
Omari Rankine
Omari Rankine
04:58 10 Jul 22
I am very pleased with the service that was provided by Polar Bear. I had an issue where the ac was not working at one of my rental properties after hours on a weekend. Rohan came all the way out to East End at 10pm and worked on the issue to get the system back up and running. He was very thorough and explained the issue in detail, and the measures I needed to take to prevent it from reoccurring. Excellent customer service

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