Model Number CGEF3031KWA Today, I was cooking at the temperature of 350 degrees. It seemed to get extremely hot and then F10 flashed repeatedly. I unplugged the stove and reset it to continue but after one half hour the F10 came on again. After reading these examples is it the sensor or the sensor board? What seems to be the problem? Am I able to repair it myself? Thank you

In most cases  it's the temperature sensor that fixes that error. The sensor you need for that model can be ordered at the link below:

https://prismparts.com/products/frigidaire-range-oven-temperature-sensor-pp4563693?_pos=1&_sid=c1bf4addc&_ss=r

The video linked below shows how to replace the sensor:

https://www.youtube.com/watch?v=mEAJBDnMTGM

I am sure you can replace it yourself, it's fairly easy.