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So to start, let me explain this error code. F30 means that the temp sensor is reading incorrectly but it's rarely the sensors problem unfortunately. These Frigidaire units are well known for the error coming up due to the display control board just not reading the sensor correctly. If you have a multimeter you can remove the oven sensor mounted to the back wall inside the oven near the top and test resistance through the sensor. The sensor should be 1080 ohms at room temperature and if not then replace it. If it checks good then unfortunately, the only fix is to replace the display control board to correct the issue and the part is about $200.
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