Doesnt sound thats its a equipment malfunction to me. same thing happened to me, but all i had to do was move the tank to a room where it was cooler. I was getting readings of 90deg both sides cool/warm. It was praobly because of the room temperature beign at that level. Well the heating devises stay off most of the time due to that as well. After moving it to room where it was cooled by a/c the tempertures returned to normal. Maybe my experince with it might help.