Why does the air conditioner run constantly?
What to do if your air conditioner is running continuously?

If you're in the middle of an active season and outside temperatures are very low or high, it's normal for your air conditioner to run longer to maintain its set degrees. However, if you notice that the unit won't stop running, and the difference between the room temperature and the outside temperature isn't very large, there's a good chance that there's a problem present.

In this article, we'll discuss how to fix your air conditioner that runs continuously on your own and when it's right to call a professional for help.

How do you fix an air conditioner that runs without stopping?
One of the most common reasons an air conditioner runs continuously is limited airflow. If there is something blocking this flow, then it can lead to a number of problems, including the air conditioner running continuously.

1. Clean the contaminated air filter
A dirty filter will restrict air from entering the air conditioner. This can cause the unit to run longer at full power. This is because it will try to draw in enough air to reach the set temperature.

If you haven't already, make it a habit to check the filter at least once a month and replace it when it is dirty.

2. Have the vents checked
Clogged vents are the other option where your air conditioner will be running at full speed to provide the air you need. Clean each vent to make sure the problem isn't hiding there.

When should you call a professional for help?
If the cause of your air conditioner's prolonged operation isn't one of the above, then chances are you'll need to call a professional technician. Let's see what other options there may be.

3. Refrigerant leak
This is one of the basic elements in any air conditioning system. The refrigerant absorbs the heat in the unit and then transfers it outside through the condenser unit. Thanks to it, the processes in the air conditioning unit take place normally. If the refrigerant level is low, the air conditioner's operation begins to lose its efficiency.

The refrigerant level is low when you have a leak. In such cases, it is certainly necessary to contact a professional to measure the Freon level, find out where the leak is, remove it and then top up the fluid to the required level.

Apart from this complicated procedure, you should also keep in mind that refrigerant is harmful to the environment and humans. Therefore, do not attempt to carry out repairs of this type yourself.

How to determine if there is a refrigerant leak in the air conditioner?

Signs of an air conditioner Freon leak are:

  1. A hissing or whistling sound from the air conditioner;
  2. The refrigerant line is covered with ice;
  3. The air conditioner cannot cool or heat the room;
  4. You have higher electricity bills.


Contaminated components
If your air conditioner's components are dirty, they can prevent it from working efficiently, causing it to run longer.

The components that are most prone to contamination are:

Condenser coils
The condenser is located outside the building and is susceptible to outside influences, including dirt. If the condenser coils become excessively dirty, it will prevent the refrigerant from releasing heat.

Evaporator coils
The evaporator coils in the indoor unit can also be very dirty, which can hinder the operation of the air conditioner. Cleaning this element is best done by a professional due to the likelihood of damaging it.

How do you know if the air conditioner coils are dirty?
You can check the condenser coils by simply looking inside the outdoor unit and determining if they are dirty.

Since the second element is located inside the indoor unit, you can check if any of the following signs are present:

  1. Strong musty odor;
  2. Higher electricity bills;
  3. Warmer air coming from the vents.


3. Improperly sized air conditioner
If your air conditioner is too small for the room you are heating or cooling, it will run longer.

Proper sizing of an air conditioner is accomplished by taking into consideration:

Square footage;
The number of people living in the dwelling;
The insulation level of the dwelling;
The condition of the dwelling's ductwork.

How do you know if the air conditioner is incorrectly sized?
If you are not sure if the air conditioner is sized correctly, seek the help of a professional. However, there are some signs of this problem:

The room is not cooling/heating well enough;
High electricity costs;
There are several hot and cold spots in the room.

You can read more useful articles on our blog. Visit Fuji Electric's website where you will find a variety of high efficiency smart air conditioners. Contact our team if you need professional advice.