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If you're getting ice forming all over, make sure the door seal is sealing up all around the freezer and refrigerator door. If there is an area it's not sealing up, open the door and heat up the door seal with a hair dryer for 15-30 minutes to reform that part of the door seal. Other than that, pull everything out of the freezer and remove the back panel inside the freezer. Check the trough below the silver evaporator coils (which are behind the back panel inside the freezer). Make sure this trough is draining properly and the hole down to the bottom isn't clogged causing it to back up and create too much moisture inside the freezer. Other than that if everything I stated checks good, there is a 1" round device clipped onto the top of the silver coils called the defrost thermostat. This is what should turn the heater off during defrost if it gets too warm so if it's allowing the freezer to warm up too much and then re-freezing that will cause the ice forming as well so you'd want to replace the defrost thermostat.
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