The convection fan, functions, lights, and main heating element all seem to work fine. Also, there are no burnt wires visible. It seems unusual that a switch would get stuck in the closed position...and I am hoping it isn't the control panel as it is very expensive!
Most likely part is the oven control board, it has relays on it . There is one stuck. IT is 2235 dollars to replace.
Testimonial: "Thanks Brad. I replaced the control board as you suggested. It initially appeared to correct the problem (circuit breaker on, oven off, heating element off). It even worked through the ops check in "bake" mode. However, once I tested "convection bake," the problem reappeared. Even after recycling the circuit breaker off and on, the heating element at the back of the oven remained on when the oven was turned off."
SOURCE: Double oven / convection not working
It is likely that the convection element is burned out and needs to be replaced. If all other functions are working then this is the place to start. Teh back panel inside of the oven can be removed by removing the 4 visible philips screws on it. The element should look smooth and round, if not then it needs to be replaced. Be sure to turn power off to the oven before replacing it. Remove the screws that fasten the element to the back wall and gently pull the element away from the wall an inch or so. the wires will be exposed and can be unclipped from the element do not let them fall inside of the back of the oven or you will have to remove the oven from the wall to get at the back panel. Install the new element in the reverse procedure. If the element looks good then it will have to be tested with a multimeter to verify that it is still good before proceeding to check the selector switch for burn marks.
SOURCE: Bosch HBL 645 Convection Oven -- No Heat
first out put voltages measures,when output voltages ok , then see the control circuit.after tnat every thing ok. replace heating elements.
SOURCE: Bosch HBL745A Oven door
My husband just figured this out.
- Follow Door removal instruction from the manual.
- There is a screw at the end of the hinge that can be adjusted.
- Adjust the screw to desired height.
- Secure lock nut.
SOURCE: bosch oven
looks as though youre circotherm element has blown (open circuit) you will need to remove oven and check with multimeter should read around 35-37 ohms on 2.5 kilowatt heater if open circuit will need replacing easy to do on most ovens and no too expensive around £30-£35 for element depends on model and output power.
hope this helps
SOURCE: bosch convection double oven,ovens won't heat,only broilers work
If it is fan assisted then check the fan element, it is located behind a panel at the rear of the oven compartment.
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Thanks.
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