Why is my AC system freezing up?

There are lots of reasons why your AC system freezes up.

Making sure the air filter isn’t dirty and airflow isn’t restricted are the only tasks you can safely take care of on your own. If you need to replace the filter, you can accelerate the defrosting process by switching off the equipment and switching on the fan. If you have a heat pump, you can switch it to heat mode until the ice has disappeared.

After the ice melts, move the temperature back to normal. If your equipment freezes repeatedly, contact Service Experts Heating & Air Conditioning to repair the malfunction.

Here are a couple other other reasons why your unit could be freezing up.

Insufficient refrigerant—Freezing up can be caused by a refrigerant leak.

What leads to a leak?

  • Weakened solder joints
  • Grating from piping vibrating against other parts
  • Cracked valves
  • Loose fittings

How long your system has been running and the spot of the leak determine whether you should repair or replace your AC system.

Dirty evaporator coil—As time passes, the evaporator coil gets dirty and leads to troubles resembling a dirty filter. You’ll slowly receive lower airflow until your unit freezes or halts cooling. You’ll need to contact Service Experts Heating & Air Conditioning to repair the issue.

Defective blower motor or relay—A blower motor going at the wrong speed or not turning on at all can result in freezing. It might also be sporadic, starting at maximum speed and decelerating after it heats up. Or a relay could force it to work one time and not the next. In either situation, you will need to contact Service Experts Heating & Air Conditioning to fix the trouble.

Scheduling annual AC maintenance may help you skip this issue. Our techs will fully examine and clean your equipment, which typically allows us to pinpoint small problems before they turn into large problems.

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