Themador Built-In Oven, Model SMW272. Bottom heating element will not heat when touch panel for "bake" is touched. Oven will reach about 200 degrees and cycle off. "Convection Roast" and "Broil" cammands work. Oven will hold reach and maintain temperature set for Convection Roast.
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Re: heating element will not heat
With all that you said, I would suspect an open or faulty element. It is pretty much the most obvious solution.
If you have any electronically ability and you are going to open the oven, use an ohm or resistance meter, check the amount of ohms and use the upper element as a reference for the correct reading. The element will either read open or good. You can use a light tester also and if the light lights between the two connectors of the elements, then it is ok and look elsewhere.
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CHECK FOR CRACKS IN THE BAKE ELEMENT. IF THE UNIT IS NOT HEATING THE BOTTOM, BUT THE TOP IS STILL HEATING, YOU MORE THAN LIKELY HAVE TO REPLACE THE ELEMENT. THIS IS A 220 VOLT OVEN WITH 110 VOLTS ALWAYS GOING TO THIS ELEMENT, SO TURNING OF THE BREAKER IS VITAL FOR SAFETY PURPOSES. WITH AN OHM METER, UNINSTALL THE ELEMENT AND CHECK BOTH WIRE CONNECTIONS FOR OHMS. YOU SHOULD GET SOME KIND OF READING BETWEEN 10 OHMS AND 500 OHMS. IF YOU'RE NOT AT LEAST GETTING A SOLID READING, REPLACE THIS ELEMENT.
Unplug the range. Remove the oven racks. Remove the screws on the bake element. Carefully pull the bake element out. Remove the wires from the element. Use a volt meter set for ohms/continuity and touch one meter lead to one element terminal and the other lead to the other element terminal. No reading is a bad element/ If you get a reading your oven control is bad.
Flip both oven breakers HARD to the "off" position, then back on. If it did not help - you might have a problem with a relay on the control board or a failed bake element. Grab a flashlight and check the element on the bottom (if you can see it). DO NOT TOUCH THE ELEMENT! If you find any bulging or cracking on the element - it'd out. Before removing the element turn the oven off on the breaker panel. PS Model number is needed to find the part numbers.
When the food you're baking is done on top but not on the bottom--or when baking just takes far too long to finish--the bake element may be burned out.
You may get fooled into thinking it's working, because the oven is hot inside. But many electric ovens use the broil element, too, during the preheat and bake cycles. So the food may be getting heated only by the broil element, which causes poor baking results.
If the bake element is burned out, replacing it should solve the problem. Otherwise, you need to further troubleshoot the oven's electrical system to locate the defective wire or component.
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.
If this is an older oven, check to see if it has a control knob or switch labeled "manual and "hold". Make sure it's set for manual. The hold setting maintains temp at about 140 degrees. If not the case, is this gas or electric?