To determine if the door switch is defective, use a multimeter to test it for continuity. The freezer temp should be kept from 0 to 10 degrees Fahrenheit. One other thing that may work and just did for me (for other users finding this now) is that one person can push the dispenser lever while another person turns off then on the main water supply valve behind the fridge- in the wall recess in my case. Mains inlet side of water valve gets 240 volts when dispenser pressed and water flows through valve. If it is too cold the water line in the door may freeze.