The winter setting operates with the heat from the factory-fitted lamp. The refrigerator and freezer sections share a common compressor that is regulated by the thermostat in the refrigerator. At an ambient temperature of less than 18 °C, the temperature difference between the ambient temperature and refrigerator compartment temperature is lower than it is in other settings, so the compressor starts up infrequently. However, there is a bigger difference between the ambient temperature and the freezer section temperature. As a result, the compressor activity at low ambient temperatures is insufficient and the frozen food can defrost. The refrigerator interior lighting therefore remains on during the winter setting even when the appliance door is closed. The temperature in the refrigerator rises as a result of the heat given off and the compressor is activated less often. A customer-fitted LED lamp does not give off sufficient heat to increase the temperature in the refrigerator section.