The room's temperature affects the freezer's performance when high levels of humidity combines with the cold freezer to produce condensation. The condensation eventually freezes on the outside of the freezer, and results in icicles. Lowering the room's temperature and setting the freezer to its default or warmer setting eliminates icicle formation.
The factory setting on your freezer is the default, recommended temperature to keep the food frozen without consuming an excess amount energy. Changes to the default setting causes the freezer's temperature to become too cold, which increases the amount of icicles on the outside of the appliance's door.
A malfunctioning freezer fan results in a freezer running excessively fast, and can result in the appliance's motor overheating while the inside is extremely cold. The freezer requires professional repair to replace the fan and regulate the freezer's temperature control.
Water leaking from your refrigerator spills over onto the freezer, and causes icicles because of the cold exterior of the freezer. Checking your refrigerator's water supply line for loose connections and tightening any loose compression nuts on the line eliminates leaks. Increase the cold setting on your refrigerator to ensure the refrigerator section is properly chilled to eliminate water leakage.