1. The temperature setting is too low: if the temperature setting in the freezer is too low, the water in the freezer will freeze.

2. Poor sealing of the refrigerator door: If the refrigerator door is poorly sealed, it will cause the outside air to enter the refrigerator and freeze the moisture in the refrigerator.

3. the humidity in the refrigerated room is too high: if the humidity in the refrigerated room is too high, the water in the refrigerated room will freeze.

4. improper placement of food in the refrigerated room: if the food in the refrigerated room is improperly placed, the moisture emitted by the food will condense into ice in the refrigerated room.

5. The drain hole in the refrigerated room is blocked: if the drain hole in the refrigerated room is blocked, the water in the refrigerated room cannot be discharged, thus forming ice.