Hey there, there re a couple of reasons that an ac unit freezes up. The first thing you need to do is defrost it. Then, check to make sure your filter is clean, the side of the coil the air hits first is clean and the scoop on your fan wheel are clean. Next, start it up wait about two minutes then feel the larger line that is covered in black insulation. Normally it is about 55 degrees. If it is colder, you have an airflow problem (dirty fan, coil, filter) if it is warm, you are probably low on refrigerant. If the line is warm, see what temp the small pipe is. If it is cool, you have a restriction in refrigerant flow somewhere. If it is warm to hot, again pointing to low on charge. Let me know what you find out or if you need anything else. Oh yeah, if you are low on refrigerant, make sure the leak is found and repaired or the problem will keep coming back
seth
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