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Why Is My A/C Running Constantly, Even When The Set Temperature Is Reached?

There’s never a time when your air conditioner should run constantly, without stopping. If this is exactly what is happening to yours, there are several issues that could be causing it and they need to be addressed as quickly as possible before your bill runs through the roof.

A runaway A/C is a symptom of a larger problem, most likely among the following:
1. Thermostat Fan Settings
2. Air Flow Restrictions
3. Dirty Blower Fan
4. Faulty Thermostat
5. Faulty Fan Limit Switch
6. Low Refrigerant
7. Dirty/Frozen Evaporator Coil

Having your air conditioner run constantly during summer in Tampa Bay, Florida, is nobody’s idea of a good time. It may ultimately lead to your entire system failing and that’s definitely something you want to avoid at all costs in the middle of a Florida summer.


Comfort Air is a licensed and insured HVAC repair and installation specialist. As a Rheem Pro Partner, we keep the air flowing throughout the Tampa Bay area. If your A/C is running constantly, even after reaching the desired temperature, give us a call right away and we can get a professional, expert service technician at your home quickly.


In the meantime, it’s important to know the ins and outs of what can be causing your Air Conditioning unit to run constantly.

Thermostat Settings

While this isn’t an immediate solution, you can check how far your A/C is going to take things or if it will shut off automatically at all. Check your thermostat and see if the current room temperature is just above the set temperature. 

If it is, raise the set temperature to match the indoor temperature. If that shuts off the A/C, you are either dealing with an A/C unit that isn’t capable of cooling the entire square footage of your house, or one that’s been reduced in capacity due to other factors.

 

Air Flow Restrictions

Your air filter is another item that’s easy for you to check and mark off of the list if it’s not a factor. If it hasn’t been replaced in some time and is covered in dust or if there is something blocking or restricting airflow, you need to remove the blockage and replace the dirty filter right away.

Go through the house and make sure that all the air vents are opened. Remove all dirt, debris, or any other potential blockages from around the outside unit. Also, make sure that the air filter is clean or replaced and that there are no other obstructions around it. 

When airflow is restricted, the system has to work that much harder to pull air through the system and distribute it throughout the house. It’s a simple obstruction that can cause a lot of problems, and it just might be behind your AC running constantly.

 

Dirty Blower Fan

A dirty cooler fan is another culprit when it comes to restricted airflow. In order to clean it, you need to be able to access the inside unit. Before you start, make sure that you turn off electrical power to the unit.

 

  • Remove the outer panel
  • Remove the panel holding the circuit board
  • Set the circuit board aside, with wires still attached
  • Remove the screws or bolts holding the blower 
  • Once the blower mechanism is exposed, vacuum all dirt and debris away
  • Pick off anything too large for the vacuum
  • Carefully wipe away any residual dirt and grime
  • Reassemble the unit

 

If you have long-haired dogs or several people who have long hair in your home, much of this hair can end up in the blower unit and wrap around the fan. Make sure you check it thoroughly and remove any and all hair from the unit. 

 

Faulty Thermostat

Most thermostats have a color-coding system for the wires behind the thermostat panel. Ensure that the power for the thermostat is turned off before you remove it. Once you have the thermostat off of the wall, do not remove any of the wires.

Instead, visually check all wires to make sure they are connected in the correct positions and are free of any dirt and grime.

Every thermostat has a shelf life and if yours is over ten years old, it’s time to consider purchasing a new one; regardless of whether or not it’s the actual culprit in this situation, an old thermostat is doomed to fail eventually. 

 

Faulty Fan Limit Switch

The limit switch is typically situated near the blower assembly on the inside unit. If you know what it looks like, you should check to ensure that it is not stuck in position. If it is, you probably need to have it replaced, especially if it continues to do so even after you reset it.

Just because it gets stuck in the override position doesn’t mean that it’s going to be an ongoing problem. After you reset the switch, give it some time to see if it is going to be a recurring problem.

 

Low Refrigerant

This is a common culprit, especially when you haven’t had your system checked in quite some time. It’s important to check throughout your system—or have it professionally inspected—to ensure that the coils aren’t damaged and there are no leaks.

Leaks in the system and damaged coils are the primary culprits behind low refrigerant levels. If you find damage or detect a leak, contact Comfort Air as soon as possible so that a qualified tech can diagnose and repair the condition immediately. 

Dirty/Frozen Evaporator Coils

Lack of cold air makes this problem easily detectable. The air will constantly blow, as aforementioned, yet it will not be cool. It may even feel a tad on the warm side. When your coils are frozen up, warm air is a common symptom. 

You can also check the lines running from the outdoor unit and into your house. If they’re covered in frost, you likely have a problem with your evaporator coils, which are probably frozen themselves. 

When the coils are frozen, your A/C system lacks the ability to pull moisture from the surrounding atmosphere without it freezing on the coils. That layer of ice serves as a barrier between your system and the energy it needs to draw from the air. 

When to Call A Professional

All of the situations above should—at the very least—be inspected by a certified HVAC technician. At Comfort Air, we pride ourselves on expedited service, especially when outside temperatures are baking your home and you need us the most. 

At Comfort Air we provide the following, must-have air conditioning services in the Tampa Bay area:

  • Tune-up and Maintenance
  • Installation and Repair
  • Thermostat Replacement
  • Thermostat Repair

All Things Considered

Temperatures in Tampa, Florida can get overwhelming during the summer, and quickly too. Make sure you have your system checked before the heat arrives so you can depend on a reliable A/C system cooling your home throughout the summer. 

Comfort Air is your gateway to a robust and efficient home cooling and heating system. Our technicians are standing by for your call, ready to provide a full range of cooling and heating services to keep your home and family comfortable and secure with a system you can depend on. 

We also provide the same services during the winter to ensure that your heating system is 100%, including your furnace. 

We provide 24/7 emergency service and you can reach us at 1-813-413-1726 or visit our website at ComfortAirFl.com.

Call us today!

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5017 W Rio Vista Ave, Tampa, FL 33634
Licensed & Insured / CAC 1819994.
Phone Number:
813 413-1726

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