Ice building up in the freezer
1.
If the freezer door is opened frequently or kept open too long, a layer of frost may build up on the freezer interior walls.
2.
Ensure the door seals are clean and not damaged.
For more information, see the Cleaning the door seals topic.
3.
If the frost is thick, defrost the freezer when it is empty.
For more information, see the Manually defrosting the fridge freezer topic.