Hi and welcome to FixYa, I am Kelly.
First off if you have an ice maker this sheeting of ice is most often caused by the ice maker inlet water valve bypassing water when it supposed to be shut off. You can check for ice in the rubber tube that fills the ice maker. If it is frozen hard with ice most likely you have an inlet water valve failure. The valve is not repairable. The only remedy is to replace it.
Second reason for ice build up on the bottom of the freezer is a clogged evaporator drain. If you see ice for sure under the evaporator coils then the drain is clogged. You clear the drain by unplugging the unit.. removing the freezer contents and directing an external fan into the freezer compartment for just over 2 hours. While this is happening... open the back of the unit by removing the fiberboard cover and cleaning out both the drip pan and the END of the compartment drain tube. I use a wet or dry Vacuum for this task. When the 2 hours of manual defrosting is completed.. use the exhaust of the vacuum on the very end of the compartment drain tube. This will float out any debris that was in the evaporator drain funnel and make sure that the compartment drain tube is clear. Make sure to clean the condenser coils and fan in the bottom of the unit while your cleaning the drip pan.
After all of the above reassemble the rear fiberboard cover, wipe up any water mess in the freezer compartment and return the unit to normal use.
Since you did not include a model number I am unable to provide you with an exact reference source for the inlet water valve. You can however use the following sites and
enter your model number for parts information:
http://www.searspartsdirect.com
http://www.appliancepartspros.com
http://www.repairclinic.com
Thanks for choosing FixYa,
Kelly
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