Why is my AC system freezing up?

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

Double-checking the air filter isn’t dirty and airflow isn’t decreased are the only tasks you can safely handle on your own. If you need to install a new the filter, you can accelerate the defrosting process by disabling the system and using the fan. If you have a heat pump, you can turn it to heat mode until the ice has melted.

After the ice disappears, move the temperature back to normal. If your system freezes a second time, call Service Experts Heating & Air Conditioning to take care of the problem.

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

Not enough refrigerant—Freezing can be created by a refrigerant leak.

What causes a leak?

  • Fragile solder joints
  • Friction from piping rubbing against something
  • Broken valves
  • Slack fittings

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

Dirty evaporator coil—Over time, the evaporator coil becomes dirty and creates problems similar to a dusty filter. You’ll gradually get lower airflow until your unit freezes or stops cooling. You’ll need to contact Service Experts Heating & Air Conditioning to fix the issue.

Broken blower motor or relay—A blower motor going at an inaccurate speed or not turning on at all can create freezing. It may also be irregular, running at maximum speed and decelerating after it gets too hot. Or a relay could make it work one time and not the next. In either state, you will need to contact Service Experts Heating & Air Conditioning to correct the problem.

Scheduling yearly AC maintenance could help you avoid this malfunction. Our professionals will fully inspect and clean your unit, which usually allows us to pinpoint small problems before they become major problems.

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