20 Most Recent Amana 19.7 cu. ft. / 558 liter Upright Freezer Deepfreeze AFU2004AW - Page 2 Questions & Answers

Unless you have a lot of expensive refrigeration tools and a license to recover and buy freon, then you need a serviceman.

No if you did work for few month

Frost will normally build up if you do not have frost free freezer and in which case it is possible the frost free system is faulty. If it is not frost free then it has to be defrosted a few times in a month. However if the frost comes up very quickly then there are possible causes. You may be having leakage from the door seals or there are items in the freezer that are not properly covered to avoid moisture escaping. Other possibility is that your freezer is set too cold and there are not many items in it.

Your drain line is clogged. Take a small diameter pice of wire and snake out the drain line from inside the freezer.
You may have to access the back rear near the compressor and separate the drain line there and clean it further.

check the defrost timer , element and defrost temperature safety.and make sure the fan works.

you should fixed cooling section.