1, the refrigerator doesn't cool mainly because the indoor temperature is too low and the thermostat of the refrigerator is set too low to cool. 2. The bigger the number of the temperature controller, the lower the temperature, the bigger the number in summer and the smaller the number in winter. 3, often open the refrigerator door, resulting in the refrigerator does not cool. 4. Whether the refrigerator power plug is plugged in. 5. Check whether the thermostat is in the working gear. The thermostat has a gear, and the compressor will not work if it is in gear. Suggested treatment: 1. Set the thermostat in the freezer to a higher gear. If there is an auxiliary switch for winter temperature, turn it on. If turning on the switch still doesn't work, you should change to a new electric heater, or after the compressor is forced to start with the top-grade thermostat frequently every day, the gear will be adjusted back to the original gear, and generally the middle gear will be higher. 2, don't open the refrigerator door often, because it is automatically adjusted with the freezing room temperature. If it can't be solved, it's better to give it to the maintenance master to avoid tossing. 3, first find out the system leakage, after welding repair, take time to test, after passing, add refrigerant to a certain amount. 4. Check whether the thermostat gear is too low. Whether the food is stored too much or put into high temperature food. Whether to open the door often, the door seal is not strict.