I have a thermador oven that suddenly stop heating on the bake, convection and covection roasting functions. If I placed it on broil, it works. I've checked the heating elements for continuity and they check fine. I've also check the high temp switch and it checked fine. I've been at this for a while now and can't seen to find out why it doesn't work other than when it's in broil mode. Can anyone help?

Hello,
The problem is in the relay board, and it was caused by interference running down the microwave's power wire and, eventually, into the relay board. This interference is scrambling the code on the relay board.

When replacing the relay board, look for the black wire that runs from the fuse holder to the black side of the terminal block. Move this wire from the black side to the red side to prevent the problem in the future.

KC