I bought used a Kitchen Aid Classic Commercial Style Dual Fuel Convection Range KDRP462. Cleaned well and hooked it up today. All burners including grill burner work fine. Oven does nothing.
The two knobs and display that control the oven appear to work properly as the display changes with the knob settings. But the oven does not heat. The 110v and 220v power supply makes it fine to the first board inside. I checked for loose wires, plugs, melted connections and so on, found nothing.
With a multi-tester I had next to no resistance through the thermal fuse. The main heating element had about 28 ohms and the broiler about 20. I verified I have 244v going between the two legs of the plug.

Any help would be much appreciated. There is a two wire plug on the back that I do not know what it is for, I though diagnostic, but I think codes may come up on the digital display, none do.