The historical tilt-back of the refrigerator is a lost technology. If the door does not have the weight of the door pressing onto the face of the frig cabinet, the suction of the door seal will not be strong enough to keep warm air from seeping into the freezer and fresh area. The temps may be set between 0-5 degrees in the freezer and 36-37 degrees in fresh food, but the warm air seeping in will prevent ice-making and cause many other issues. The tilt-back assures you that the Earth's gravity is pulling the door to the cabinet. This tilt back should have been done at installation and should be the first troubleshooting for many problems. I was a Technical Specialist for Sears for 5 years. I resolved 3-4 of these every day just by over-the-phone troubleshooting. The manufacturers have the tilt-back is in their installation manuals, yet delivery and repair technicians are oblivious to this technology, even though refrigerators have depended on the Earth's gravity to assure a good suctioned door seal from the beginning.