There are 4 main reasons your AC is icing over
There are many reasons why your AC could be freezing up, but we’ll cover the 4 most common here. The #1 most common culprit is low refrigerant. Lacking refrigerant can cause the coils to get too cold and ice over. A related issue could also be that your air conditioner’s blower fan is not working properly. This will prevent air from moving through your AC system and make it hard for the coil to stay warm.
Other airflow issues could be easily solved. Check your air filter and change it if it’s dirty. Then wait a few hours to see if system operation improves. Also make sure all your indoor registers are clear and open.
The final major cause of an AC freezing is a dirty coil. The evaporator coil inside your air conditioner cools the air inside your home, but it also dehumidifies it. By doing so it pulls water from the air and that water can cause condensation that builds up on the coil. Getting regular AC maintenance can help to avoid this issue as the coil should be cleaned with each tune-up.
If you have gone through all the steps above and your AC still is not blowing cold air, call a professional AC service company to assist. Before calling, make sure to turn off your air conditioner so that it will be thawed by the time the technician arrives and they will be able to diagnose the problem more quickly. This also prevents further damage to your AC if there is an issue with the fan or coil.