ice build up in freezer compartment on Amana Bottom Freezer Refrigerator

Here's an inexpensive, though inconvenient, way to determine if the problem is with the self-defrosting system. Remove all of the perishable food from the refrigerator and freezer, turn the thermostat in the refrigerator to Off, and leave the doors open for 24 to 48 hours. (Be sure to have several towels ready in case the melting frost and ice causes the drip pan to overflow). This allows the refrigerator to defrost "manually." When the frost and ice build-up has completely melted away, turn the thermostat back to a normal setting. If the refrigerator then cools properly, it indicates a problem with one of three components in the self-defrosting system: The refrigerator is supposed to self-defrost approximately four times in every 24 hour period. If one of the components in the self-defrosting system fails, the refrigerator continues to try to cool. Eventually, though, so much frost builds up on the evaporator coils that the circulating fan can't draw air over the coils. There may still be a small amount of cooling because the coils are icy, but with no air flow over the coils, cooling in the refrigerator compartment is quite limited. The defrost timer The defrost thermostat (also called the bi-metal switch).

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Refrigerator is not cooling properly?

http://technoanswers.blogspot.com/2011/06/refrigerator-is-not-cooling-properly.html

Both refrigerator and freezer not cooling properly in refrigerator?

http://technoanswers.blogspot.com/2011/06/both-refrigerator-and-freezer-not.html