Hello Luciano, it is completely normal, that your refrigerator, make ice on that bottom wall, you must adjust the thermostat, so that the ice or frost, formed on the bottom wall of the area below the refrigerator, does not exceed 1 centimeter of thickness of said frost, since after that amount or thickness, the exchange of heat that must be produced between the food stored in that conservation zone and the refrigerant gas circulating inside the evaporator plate, located on the wall from the bottom of the refrigerator, it would be lost and the refrigerator would obviously stop cooling. In addition to this growing ice can leave the products stored in that place stuck in the bottom. When regulating the temperature, the compressor would begin to do its work and rest cycles, to keep a fine frost on that wall and then when the compressor stopped, it would be normal for that frost to disappear completely until the compressor then with its work Reform it. That is, whenever the compressor works, there must always be a thin layer of frost on that wall and then disappear, completely when the compressor stops working, when the compressor stops running routinely, through the thermostat or temperature control, also located in the lower area or storage or maintenance compartment, as you wish to call Luck. S @ lu2 friovega63.