I have a Kenmore upright freezer which was working until I turned the temperature down to clean it. Now I can't get it to freeze again. None of the button's work. It is model 253-28092801 and serial #WB85147510. I tried to unplug it and that didn't work. Any sugguestions. The window says OF which I'm assuming is OFF but I don't know how to turn it back on. HELP!!