Why is my AC system freezing up?

There are a lot of reasons why your AC system freezes up.

Making sure the air filter isn’t clogged and airflow isn’t decreased are the only work you can safely handle without professional help. If you need to put in a new the filter, you can hasten the thawing process by disabling the system and turning on the fan. If you have a heat pump, you can switch it to heat mode until the ice has melted.

After the ice disappears, turn the temperature back to normal. If your system freezes again, call Finch Air Conditioning & Heating to fix the issue.

Here are a few other reasons why your equipment might be freezing up.

Not enough refrigerant—Freezing up can be caused by a refrigerant leak.

What leads to a leak?

  • Weak solder joints
  • Grating from piping vibrating against other parts
  • Ruptured valves
  • Loose fittings

How long your unit has been installed and the location of the leak play a part in whether you should repair or replace your AC system.

Filthy evaporator coil—Over time, the evaporator coil attracts dirt and creates problems much like a clogged filter. You’ll slowly receive lower airflow until your equipment freezes or quits cooling. You’ll need to contact Finch Air Conditioning & Heating to take care of the issue.

Malfunctioning blower motor or relay—A blower motor working at an incorrect speed or not working at all can cause freezing. It could also be irregular, starting at full speed and slowing down after it gets warm. Or a relay could cause it to start one time and not the following time. In either state, you will need to contact Finch Air Conditioning & Heating to correct the problem.

Scheduling yearly AC maintenance can help you avoid this malfunction. Our techs will fully check and clean your system, which often allows us to catch minor problems before they turn into major issues.