Operation and faults of the refrigerator or refrigerator without frost commonly called no froster, in these refrigerators or refrigerators the core part that differentiates them from normal ones that do frost is a small device called "Timer" which for eight hours sends electric current to the compressor for it to freeze and for half an hour it diverts the current to the freezer where under the coils there is a resistance that turns red hot or incandescent to melt the ice that has formed.
When that ice melts, it goes through a drainage hole to a tray that is on the compressor and later with the heat that it generates, it can evaporate.
The function of the fan is to circulate cold air through the entire refrigerator to cool food.