Ms. Zhang said that she had bought her refrigerator three years ago and it had always been fine before. She did not open the refrigerator door the day before yesterday, but on the second day, the ice became harder than stone. Neighbors said that it might be caused by a lack of ammonia. Ms. Zhang has always been dubious and hoped that this newspaper could find an expert to help ask. Master Qiu from an electrical maintenance company on Jinlian Road, Fuzhou said that the temperature control may not be properly controlled, or the refrigerator fan may be broken, or the refrigerator door may not be closed tightly, allowing air to escape, etc. The master suggested that the problem be caused by Experts came to find out why. As for the lack of ammonia, Master Qiu disagrees. "If the refrigerator lacks ammonia, it will not be able to cool, let alone freeze." Regarding de-icing >> Master Qiu has three simple tips: 1. Before putting in frozen food Previously, a layer of plastic film was applied to the wall of the freezer, and the cold air in the freezer was used to quickly apply it, and then the food was put in to freeze. When defrosting is required, quickly move the frozen food into the refrigerator for temporary storage. As long as you tear off the plastic film in the freezer, the frost will be quickly removed. Then apply the clean film and you can continue to freeze the food. . It only takes a minute or two before and after, which is very time-saving and trouble-free. 2. After defrosting each time, dry the freezer with a towel, and then apply a layer of vegetable oil on the surrounding inner walls. When frost occurs next time, there will be a gap between the frost and the refrigerator wall due to its adhesion to the oil-containing refrigerator wall. The suction power is greatly reduced, so the clumps can be easily peeled off without much effort. 3. When it is necessary to defrost, first cut off the power of the refrigerator, and then use an electric fan or hair dryer to turn it on the freezer to the maximum. After the wind blows, the frost layer will melt very quickly, making it easier to remove. If the refrigerator is used for a week or half a month, it is better to turn off the power and open the refrigerator door fully, and then turn on the power again after all the ice has melted. This will be better.