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I have a RUUD RCBA-3765G Coil. When my AC stopped cooling I went to the basement and opened the access panel. When I looked at the coil it was frozen completely, the insulation was frozen to the front of the coil and inside all the fins/tubing had about 1/4'' of ice. I defrosted it and the AC is working fine. My question is what caused this?? Thanks.

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This could be caused by a low refrigerant charge or dirty filters restricting the airflow. Also it will happen if the indoor fan isn't running.

Posted on May 02, 2010

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Here are some steps that you may follow.
Take come caustic soda ,(put a table spoon in one glass water) that will be in powder form (caustic soda) ,
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