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Why AC Stops Working? The Most Common Problems with Air Conditioners

An air conditioner can be found in almost every modern home. During the hot season, this household and industrial appliance work uninterruptedly for hours and, in some situations – all day long. As well as any mechanisms, air conditioners can break down. The breakdowns can be different. In this article, we have compiled the most common problems with air conditioners that cause the unit to stop forming the proper microclimate in the room.

common ac problems

8 Most Common AC Issues

Issue #1: Clogged Filter

Clogged filters are the most common problem with central air conditioners that bother owners of these appliances. It is quite possible to clean the filter yourself. This element must be cleaned regularly for the unit to function correctly.

For the equipment to function correctly, the air conditioner must have a full flow of air. If the filter gets clogged, it will significantly complicate the process. The equipment will have to work harder to maintain the set temperature in the room. The filter can be rectangular or square. It is located inside the unit.

Issue #2: Thermostat Problems

Thermostat problems are most often caused by improper installation. Also, failure is provoked by malfunction and other factors. The main task of this element is to measure the temperature. If the thermostat has stopped working correctly, it should be replaced with a new one. In addition, you should ensure that this element will be replaced by an objective professional.

Issue #3: Freon Leaks

Modern air cooling systems boast excellent protection. At the same time, refrigerant leaks occasionally do occur. Even a tiny hole is enough for a severe problem. If you notice that your air conditioner has started letting out warm air or it’s freezing, there’s a good chance there’s a freon leak. The leakage itself is not harmful to the equipment. Still, it can contaminate the environment and cause discomfort for the conditioner’s exploitation by the tenants themselves.

The main difficulty of this breakdown is that it is challenging to find the place of the leak. A true professional can solve this problem quickly.

Issue #4: Failure of Switches and Blown Fuses

Among the most common breakdowns is the improper installation and/or wiring of the air conditioner. If the fuse does not fit or is improperly installed, the flip switch will create significant problems during operation.

This problem should be left to true professionals to solve because if you don’t have the proper experience with electricity, it can lead to a whole host of additional problems, including short circuits and system fires.

Issue #5: Compressor Failure

An air conditioner malfunction can be triggered by a malfunctioning compressor. If it doesn’t turn on, the same air will come out from the outside – there is no cooling. The compressor is one of the most important mechanisms. Most often, the breakdown of node costs the most money.

The main sign of compressor failure is when the equipment begins to produce a different noise not characteristic of it. Often a person can hear the compressor turn on in the system. If you don’t hear tthe distinctive noise, the compressor is most likely out of order, and it’s time to call a handyman to inspect it.

Issue #6: There are Clogs in the Drain Lines

The cooling process produces condensate and liquid. The latter needs somewhere to go. It is for the task that drain lines were invented. But during the use of the air conditioner, they can get clogged. As a result, water begins to seep into other places where essential assemblies may be located.

Cleaning the drain lines is a relatively simple task that doesn’t take much time. If the problem is set in motion, the accumulated water can cause significant damage to the system. Clogged drain lines are one of the most common damages to an air conditioner. To avoid this, you need to check the condition of the equipment regularly.

most common ac problems

Issue #7: Contact Problems

There are many contacts inside the air conditioner that carry electrical current. In addition, the main components are equipped with on and off options. Over time, the connections can become damaged and fail, provoking other problems. To fix the problem, the contacts need to be cleaned or replaced. The issue can always be handled by a real craftsman.

It also doesn’t hurt to run a periodic diagnostic to determine the condition of the AC unit and what state the contacts are in.

Issue #8: AC Unit Failure

The AC unit is quite challenging to repair. In this situation, the element is often replaced with a new one.


In operation, the owners of split systems and other equipment may encounter a variety of breakdowns. This article considers the most common problems with central air conditioners: not starting, stopping maintaining the proper temperature, and others.

If you encounter any of the above signs, you should contact a proper air conditioner repair specialist.

  • What are some common reasons why an AC unit may stop working?
    A dirty air filter, low refrigerant levels, or a malfunctioning compressor can all cause an AC unit to stop working
  • How can I troubleshoot my AC unit if it's not working?
    Try checking and replacing the air filter, ensuring that the thermostat is set correctly, and checking for any leaks or damage in the refrigerant lines.
  • When should I call a professional for AC repair?
    If you've tried troubleshooting the AC unit and it's still not working, or if you notice any unusual sounds, smells, or signs of damage, it's best to contact a professional for repairs.

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