This unit is used but was working great all the way till it was unplugged by an electrician and turned over to me. I told him I was going to plug it in to my dryer outlet and make a pizza and he said "Uh, don't do that, " then going on about the right voltage blah blah, so he warned me and I'm warning you: have an electrician oversee the installation of this expensive piece of equipment. Please see pics and feel free to ask questions.