The "F2" and "F3" fault codes is most likely indicating an open oven temperature sensor circuit or an open temperature sensor. The temperature sensor is the probe that you see sticking into the oven cavity in the upper left or upper right rear corner. It can be tested with an OHM meter to see if it's open or not. The oven sensor can be removed and disconnected and tested with an ohm meter for resistance. The sensor should measure 1100 ohms at room temperature. If it measures approximately 1100 ohms then the sensor is okay and it should be re-connected and installed. Next, the control panel will need to be taken off in order to measure the temperature sensor circuit at the control board.
NOTE: Disconnect the power supply from the oven before removing the control panel.
The sensor connector will need to be disconnected from the control and re-measured again for the proper resistance. If the sensor ohms approximately the same as it did when it was measured directly across the sensor, then the control board has failed and it will need to be replaced.
Your oven is repairable and I recommend calling a service technician to diagnose and repair your oven or purchase the oven sensor and install it yourself and it may solve your problem. The oven sensor is part #WB23X5340.
is part #WB23X5340 and can be ordered from Sears Parts Direct. Click on "oven sensor" and it will link you to Sears Parts Direct with the sensor already looked up for you.