The F3 code means that the temperature sensor in the oven is not giving the signal to the oven control. This could be the result of a problem with the wiring or the wire harness between the control board and the sensor or indicate that the sensor itself has failed.
To identify the correct parts, you need to provide your oven model number. Try here: http://www.partselect.com/Magic-Chef-Parts.htm . There are other sources for parts.
I hope this helps. If you add a comment with the model number, I'll be glad to give you more specific information for your wall oven.
Cindy Wells
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