Be sure the thermostat is switched to Cool , the Fan is switched to Auto, and adjusted low enough to be turning on. Be sure the filter is clean.

Low Refrigerant: In most cases, this is caused by a leak in the refrigerant lines. Weak solder joints, friction from piping rubbing or vibrating against an object, leaking valves or loose fittings. Depending on the age of the system and the nature and location of the leak is the determining factor on having it repaired or replaced.

Dirty Evaporator Coils:
Over the years, the Evaporator coils will become dirty. When this happens, the results are the same as a dirty filter. Gradually you will loose air flow, slow enough you probably would not realize it until it just freezes up or it is not cooling as well as it did last year. Unfortunately, you will need service for this one. Cleaning the coils can be difficult and may need to be removed to be done properly.  Chemicals and a lot of rinsing will be necessary.

Defective Blower Motor or Relay: A Blower motor not running or at the proper speed will cause freezing. It could also be intermittent.  Starting at full speed and slowing down after it heats up. Or a relay could cause it to start one time and not the next. Either case you will need Service.

If you find your system was freezing because of a dirty filter, after replacing or cleaning the filter you can speed up thawing the ice by turning the system off and turning the fan on. If you have a heat pump, switch the system to heat until the ice has melted.  After the ice has melted, switch everything back to normal and switch to cool.  If this has not answered your question, you may need to call for service.
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Air Conditioning Freezing Up
There are several areas which could cause your system to freeze up. Most of which will need professional service. Making sure the filter is clean and the air flow is not restricted is about the only items you can check yourself. Other than that, you will need to call your Service
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