The F3 indicates the oven sensor is bad. You can test the oven sensor. Begin by disconnecting the power to the range and removing the rear panel covering the ERC. Remove the back panel from the range and follow the oven sensor wires up to the control. Disconnect the plug on the ERC containing the oven sensor wires and read the resistance of the oven sensor. It should read between 1000-1200 ohms.
If the oven sensor tests within this range the ERC is defective. If it tests out of the range disconnect the wires from the oven sensor and measure the resistance of the oven sensor. If it tests out of the range the oven sensor is defective. If it tests within the range the harness between the ERC and the oven sensor is defective.
Always unplug or de-energize electrical equipment before removing covers or attempting service. The oven temperature sensor is located in the oven cavity in the upper left rear corner or the rear upper right corner. The oven temperature sensor probe can be removed and disconnected from inside the oven cavity and tested with an Ohm meter. Pull the sensor into the oven approximately 10 inches for access to the quick disconnect. The oven sensor should have a resistance measurement of approximately 1100 ohms at room temperature. If the oven sensor does not have approximate resistance of 1100 ohms, replace the sensor. If the sensor ohms at approximately 1100 ohms then you will need to reconnect it and then make the same test up at the control board by disconnecting the sensor harness plug and rechecking the resistance across the two sensor wire leads. If it measures approximately 1100 ohms there, replace the control board.
If you do not feel comfortable performing this procedure, I highly recommend having a technician come out to diagnose and repair your appliance.