Bosch convection double oven,ovens won't heat,only broilers work

possible bad control boad

It does sound like the element may be bad. The control will cycle the bake and broil elements to even the heat in the oven. if the element is out the oven won't heat well.

I have the Frigidaire PLEB30S8CCA single wall oven. About 3 months ago the baking element appeared to have gone out. We replaced it, but still didn't work. We ended up sending our control board off to a company named Corecentric. They fixed the problem and returned it to us. The oven has worked perfectly ever since. I searched extensively for a new one, but no one sold them anymore. I found Corecentric on Ebay. They were able to confirm over the phone that it was more than likely a control board issue. It cost about $130. My husband was able to do it himself by taking a couple before px and using them when reassembling it.

replace the oven temp sensor, it looks like a metal rod sticking out from the inside back wall inside the oven. part here....
http://www.repairclinic.com/PartDetail/Oven-Sensor/650101/1557889

It could be the switch or heating element

it could be the oven temp sensor rod located near the top of the inside of the oven,or possibly the bake element has a hot spot on the element and can no longer pass enough current thru this spot to correctly heat to your settings a hot spot on the element will look discolored in this area

The good sign is that the motor works fine as do heaters. If the operator interface acknowledges feature selection by beeping or what have you, we can safely say the problem lies with the control board or relay.

id say something different like a thermal fuze or relay

relay in the control circuit maybe bad

this could be due to more than one cause selector switch faulty elements faulty. however this would mean both elements gone - there is one at the top and one at the bottom also worth while looking at the wiring to the convection elements. does the thermostat neon come on when convection is selected?