Have a Thermador built in SMW272..oven will not heat up, neither the oven elemnt of the broil element...I cna hear the fan and the control panedl stays at 100, no heat

Hi, Check fuses on the stove. Check the breaker panel for correct breaker and if breaker has tripped.
Then you will have to ask a technision to look at it further. Good luck

https://www.repairclinic.com/RepairHelp/How-To-Fix-A-Range-Stove-Oven/18---/Oven-won-t-turn-on-
Oven Won Turn on

the broil element
is the heating element that is found at the top of the oven and produces a very high heat for broiling. If the broil element isn't working, you should first do a visual inspection for signs that the element has blistered or separated. If the element appears normal then you can check for continuity with a multi-meter. Remove power from the appliance before performing this test. Remove the back panel and locate the terminals for the broil element and inspect the terminals and wires for signs of overheating or damage.

If there is no continuity then the element will need to be replaced. If the wires are damaged then they will need to be repaired. If the element is ok then you will need to check the broil circuit to determine the cause. This involves live voltage checks and should only be performed by qualified persons. Components to check include fuses, if the range is equipped, and oven control thermostat or electronic control. Depending on the manufacturer of the element, you will normally read between 19 ohms and 115 ohms

relay, relay board, oven sensor.

Never use Self-Cleaning!!! It will fry components, melt connectors, and burn wires. If you have violated this rule and an oven no longer works, it is probably not a bad element if neither the bake nor the broil work. It is likely the high heat cut out breaker.

On a Thermador CT 227 double oven, there is a panel on the right side (facing the unit) that is about 3 inches wide and runs from top to bottom held in place by about 6 or 8 screws. Turn off the power, slide the unit out of the kitchen cabinet, remove the sheet metal panel and you will see two high heat cut out breakers. They have a small red button in the center that resets the breaker. Push firmly and you should hear a click. If there is no click, check the unit for continuity. If it is open and the button push does not reset it, the unit may be fried. These breakers trip with high heat and will prevent both elements in an oven from heating. If the breaker is good, you'll have to test the leads to each element and then trace the dead lead to the problem.

Likely to be the Hi Limit Switch or the relay/power board.

Best Regards,
Bruce
www.fixyourboard.com

If the electronic control is blank then an inline fuse to the control has blown due to overheating in the area of the controls. If the controls are visable but nothing in the way of high voltage works then that is the limits in the rear of the ovens.

If you need further help, reach me via phone at https://www.6ya.com/expert/dan_73bbd84fe1d95b61

I just found out my baking oven doesn't work and I hear the fan for the convection roast, but no heat. I had the appliance man out and he said that I need a relay board! Big bucks and they don't make this model anymore. Moreover, the microwave and warming drawer work fine. This is ridiculous!

The control switch may be bad on it. If there are 2 elements on the top, they both are not bad at the same time.Check to see if the wires have not burned off the control switch first. Check to see if your breakers are O.K. Turn them both(maybe 3) off and then reset.

since you said the broiler does work , take the wires off the broiler element and put on the bake . then when you put on the broiler the bake should work . the light bulb principle, just remember to wrap all loose wire with electrical tape and disconnect from wall while working.

I found I have this exact problem. Same bake preheat issue: I can bake if I set broil first. However, the oven doesn't work if I press bake first. The control board has already been replaced a couple times over the years. Is this another replacement??