The problem here is the defrost drain is blocked, In order to fix this problem remove the shelfs/drawer from the freezer, Next remove the lower panel in the rear. Behind this panel you will see the evaporator (looks like a car radiator) below this you will see the defrost drain pan.Use a hair dryer to melt the ice you will see in the drain pan. Mop the water up you will then see the defrost drain. Pour hot water into the drain pan, leave the water for a few minutes then mop it up, Repeat this several times until you see the water drain away.At this point you will be all set and can button the unit back up :)
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