In a fridge/freezer combination unit, the fridge is usually cooled by the cold air that leaks from the freezer. In a full-size fridge/freezer, there is an electronically controlled vent between the two. In a smaller fridge/freezer like yours, there may just be a single sensor in the freezer. So if the door between the two sections is not shut, more cold air is escaping the freezer compartment. The fridge/freezer is working extra hard to make up for it and keep the freezer compartment cold.
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