• 26 MAR 18
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    Why Is My Air Conditioner Freezing Up?

    Why Is My Air Conditioner Freezing Up?

    If you are searching for “why is my air conditioner freezing up?” or “how to unfreezee air conditioner?“, this post should help list the reasons why and how to fix it!

    Reasons Why Your Air Conditioner Is Freezing Up

    There are a variety of reasons that could cause your AC to freeze, so below are the most common to some rare causes of your AC freezing.

    Basically, your AC is beginning to freeze up because there is something causing the Freon in the system to expand more than it should, which is making the coils colder than they should be, or there is something that is keeping the air in your house from sending its heat into the AC system. Either way, this will cause the evaporator coil to drop down below freezing and then causes the AC to freeze. When this happens your ac stops cooling. Here are the most common causes of air conditioners freezing up:

    1. Not enough air flow across the evaporator coil can cause the unit to freeze up.

    A split AC is designed to drop the temperature in the house by taking the heat out of it. If your AC isn’t properly blowing the inside air over the evaporator coil, then the heat exchange can’t happen and the Freon that is supposed to remove the heat from the home can’t do that. Over time, the temperature will continue to drop, and the AC will free up.

    1. Your AC can freeze if it is low on refrigerant.

    Because of the low pressure that is inside of your AC system, it can freeze if there isn’t enough refrigerant. This is due to there being not enough Freon within the system, and it is being forced to keep expanding using the same amount as a full charge, which basically is more expansion at colder temperatures. As the AC evaporator coil starts to drop the temperature below the freezing level, then the moisture that is in the air freezes as it makes contact with the evaporator coil which causes it to ice up.

    1. AC’s are meant to work within a set range of temperature.

    If you have been running the AC unit when the air outside is below or around 62˚F, then the pressure inside of the system will start to drop and this will cause the central AC to freeze.

    1. Mechanical Failure can cause the AC to freeze.

    If you have a kink in the refrigerant lines, a clogged filter dryer, a blower fan that is dinged and out of balance or a blower fan that isn’t running, then these can cause a pressure change in the system and cause the AC to freeze up.

    But, the question is which is it and how can you fix it? How to troubleshoot your AC that is starting to freeze up is talked about in the next section. However, if you have already found out that it’s time to replace your AC, you will want to make sure that you don’t overpay for it. This program will help to save you money and reject or accept bids with confidence.

    How To Unfreeze Your Air Conditioner? AC Troubleshooting.

    Just because the AC is beginning to freeze up doesn’t mean that you will need to call an HVAC professional. There are some professionals that will say that they are the only people who should touch your unit, and if you don’t feel comfortable when dealing with your AC, then call a professional. Either way, the first thing that you will need to do is turn the AC off and let it defrost. Ice can actually hurt your AC unit. If you feel comfortable with dealing with your AC, and you have some basic knowledge of being a handyman, then there are a few things that you will need to look at before you call your local HVAC professional. To start troubleshooting a frozen AC, it is recommended that you do these steps in order:

    You want to start by making sure that you are not running the AC when the temperature is below 62˚F outside. If you are, then stop and see if this fixes the issue. This is one of the simplest fixes, but it can cause major issues. Next, if the AC is still freezing from restricted airflow, then you will need to rule this out and the best way to do that is to check for the following:

    1. Check the air filter for the AC if it is starting to freeze.

    This is a very common cause for restricted airflow in your AC. You will need to be using a high-quality air filter and it should be replaced every 2 or 3 months. If your AC filter gets clogged up, then the restricted airflow will cause the temperature in the system to drop, and this will cause your AC to start freezing up.

    1. Check out the evaporator coil if the AC is starting to freeze.

    Having a dirty evaporator coil can actually cause a lack of airflow which drops the temperature and causes the AC to start freezing up. It is also a recipe for a lot of nasty issues with your AC such as Dirty Sock Syndrome. It is recommended that you clean your evaporator coil as a step in troubleshooting a frozen AC.

    1. Check on Airflow Restriction from the Ductwork.

    You will want to start by opening up the AC registers or vents. Any type of restriction in the airflow can cause the AC to freeze up, so you want to ensure that you are inspecting the ductwork for any disconnected areas, leaks or bends in the ductwork. To be able to do this, you are going to need to go in the attic. You will need to be very careful if you have never been in your attic before, if you haven’t then you can ask someone you know who does and ensure that only the joists are walked on.

    1. Check for really dirty ductwork if the AC is freezing (meaning that it’s so dirty that airflow is restricted. A bit of dust is okay.)

    If the ductwork is in order, then remove a register and look inside of the duct. No one is a fan of having the ductworks cleaned, but it may be needed at times if you or a prior owner did not use quality air filters. It may be best to have the ductwork redone, as cleaning the ducts doesn’t work great and it can even damage the ductwork.

    If your AC unit is still freezing after you have followed the steps above, then you have done all that you can do. It is time to call a HVAC professional. The next cause may be because of a system with low-pressure because of there not being enough refrigerant in the system, or there could be too much Freon in the system, which is only supposed to be messed with by a HVAC technician that is certified for refrigerants, or it could be that there is a problem with the refrigerant lines or blower fan. You do not want to mess with those on your own. At this point, it is best to call a local HVAC professional and if it is needed, it would be a good time to purchase a new AC unit.

    A/C & Refrigeration Co Can Help With AC Repair In Phoenix, Arizona

    Have you attempted solving the AC problem on your own? Did it work or is the air conditioiner still blowing out warm after the all of issues above were addressed?

    Do you live or do business within Phoenix, Arizona and need the help of an AC professional to troubleshoot your A/C system to get it back running again? If so, contact the professionals at A/C & Refrigeration for assistance.

    If you are within our Phoenix servicing area and your air conditioner is not cooling the house, simply contact us today to receive a quote or schedule a time for an A/C repair. Our team of HVAC professionals can help get your AC blowing cool again, whether the unit is a Trane, Carrier, Goodman, Rheem, Bryant, Amana, York, Lennox, or another brand.

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  • […] issues can cause your AC to freeze up and stop blowing cold air. If you have a a clogged filter dryer, kink in the refrigerant lines, a […]

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  • Posted by Betty muhlhauser on September 24, 2018, 8:28 pm

    Thanks for this "what to do" video. It is the first one that tells me specifically what to check. I just wanted you to know that it is appreciated.

    Reply →

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