Thank you for your question and I understand your concern.
The "F3" fault code indicates a problem with the oven temperature sensor probe or the oven temperature sensor probe circuit. The sensor could be faulty or it could have a loose or bad connection in the circuit.
The "F2" fault code is likely displaying for the same reasons. I added a YouTube video showing how to
the oven temperature sensor. If the sensor fails the test, replace the sensor. If the sensor tests Okay, check the sensor circuit where it connects at the oven control board.
NOTE: Disconnect the power supply from the oven before checking the connections at the oven control board.
If you do not feel confident repairing this problem yourself, then you can have it repaired at your home by a Sears technician. Here is a link for the website:
Sears Home Services