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My AC line is frozen: what to do?

My AC line is frozen

5 Reasons why your ac is freezing up

  • Very dirty furnace filter: one of the common reasons why your Ac is freezing up is a very dirty furnace filter. The most common causes of line freezing are dirty filters or dirty evaporator coils.

If you are doing any kind of construction sheetrock any wood cutting or even painting when you are sanding the walls that fine dust will get sucked in by the return air and plug up your filter real quick.

When you get really dirty there’s not enough airflow going through the evaporator coil which causes the temperature of the refrigerant to drop because the air is not absorbing that cooling and slowly that evaporator coil will start to frost up and build up ice so the condensation that’s running down your coil and then going down that condensate drain, that condensation will start to freeze up. Sometimes if you are been running it for a long time the thicker line of pipe will start to freeze up, especially in the areas where there’s no insulation.

  • Too many registers closed or returns blocked: if you have too many vents closed off or even worse if you have some of your returns grills closed off so maybe you were moving around some furniture you put a couch in front of a return or something blocking it that yield you similar results as having a plugged filter. so if your AC is freezing up one thing you can try doing is opening up all vents and making sure that all your return grills are opened up as well.
  • Unit low on refrigerant: Another common reason why your AC will freeze up is that the unit is low on refrigerant or low on Freon.
  • Thermostat set too low: Another thing that can cause your air conditioner to freeze up is if you are setting your thermostat too low. The lowest set point that most air conditioners are designed for is about 67 degrees.
  • Blower motor burnt out: If your blower motor is not working inside of the furnace, if it’s burnt out or maybe the capacitor for it is either weak or dead. If that blower motor is not spinning there’s no air going across that evaporator coil it will freeze up in minutes. Another cause of refrigerant lines freezing is due to a failure of the blower motor. Other causes are refrigerant circuit problems or a bad thermostatic expansion valve.

What to do when the air conditioner freezes up:

  1. Check the filter: If your system is freezing up the first thing that we are gonna want you to check is a filter. You are gonna want to have the unit off remove the filter door and then remove the filter itself.

Check to make sure that your air filter is clean and doesn’t require replacement, which should be done every 60 to 90 days. If the filter was completely clogged that can be the primary source of a system freezing up.

  1. Evaporator coils: you’ve got the doors off to the unit check evaporator coils. If you see your evaporator coils are frozen over and our fan is not running. If our fan is not operational so the next step would be to have a service professional thoroughly clean the evaporator coils.
  2. Blower motor failure: The blower motor failure will require technical knowledge and a service professional to diagnose and repair.
  3. If your AC is freezing up one thing you can try doing is opening up all vents and making sure that all your return grills are opened up as well.

How long does it take for AC to unfreeze?

Your AC blower motor pulls in warm air from inside your home and blows it over the refrigerant coils that make up the evaporator.

How long should I leave my AC off when frozen?

Find your electrical breaker box and turn off the switch that controls power to your air conditioner to start the thawing process on the coils, which could take up to 24 hours. You can also simply, turn off the system and turn on the blower to help thaw the evaporator coils.

What happens when the air conditioner freezes up?

An AC works through a refined control of temperature, pressure, and airflow. If any of these things fall out of balance, the refrigerant system that creates the cold air can overclock and freeze itself, without actually making your air any color. A frozen AC will either blow warm/cool air or nothing at all.

Conclusion

In this article, you learned why your AC is freezing up? What to do when the air conditioner freezes up, How long does it take for AC to unfreeze? How long should I leave my AC off when frozen? What happens when the air conditioner freezes up?

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