I have had a problem with my new electric stove it won't preheat or even boil water. I had sears come out and they told me it was my wiring in the house. I checked the volts coming to the outlet (220) when i go from white wire to black wire I get 240 volts when I go white to red I get 120 when I go black to red I get 240 I am not sure if this is right or not. somebody please any advice is greatly appreciated.