Check the oven sensor resistance at the control board plug.
It suppose to be about 1100 Ohms at the room temperature.
If the reading there is wrong, check the sensor resistance at the sensor plug and the wire harness.
If there is nothing wrong then replace the control board.
- The part number for the control board is
AP2150433
- Here are the break down diagrams for the Frigidaire range
Model FEF368CCTA
Good luck.
Gene.