Refrigerator, a kind of household electric device that is common to our families, basically has refrigerators in every household. Its main function is to help us keep food or freeze it, because it tends to be very bad for some time, especially during hot summers. Sometimes we like to use refrigerators to make some cold-drinking food, which is delicious and can heat up. But what is the reason why refrigerators may not be cooled sometimes? What sho