Having an issue with my electric wall oven. Jenn Air ww30430w. Top oven bake element will not turn on. Had a prior issue where the female wire harness on the orange wire melted away. Replace harness and bake element. Bake burner replace approx 2 months ago. Recently had the same issue. Insulation around female wire harness on orange wire gone. Replace female on orange again. Still does not work. Main board 2 - 3 yrs. Is it the high limit switch that is faulty or am I looking at needing to buy a new board?
Here are your parts
Replacement parts for JENN-AIR WW30430W Walloven - S/c Ele | AppliancePartsPros.com
Here is a service manual. It covers several units so you have to be careful that the section you refer to is for your specific unit.
http://www.servicematters.com/maytag_library/docs/16010312.pdf
Looks like the hi-limit is for both the bake and broil elements so if broil is working the hi-limit is not your problem.
First place I would check is the relay board.