Burners in electric ranges and ovens run at 208 or 240 volts. The only need for a neutral at all is for the 120 volt accessories, such as clocks, lights and timers. My guess would be that the neutral is open or has a fault so the neutral isn't able to provide a return path from one or all of the 120 volt accessories. Does the clock and light work properly?
I am concerned that you mentioned 120/208 since this would indicate a three-phase service. Is this in a multi-tenant building? If so, the panel in this unit would effectively be a sub panel. In this case, there should be a fourth wire for the ground connection to the range.
