Your model number should be much longer than 790 30 Open drawers and doors to look for the whole model number around the frame.
With the whole model number you can get more information at Sears Parts Direct. There are parts diagrams and user manuals and you can order parts.
http://www.searspartsdirect.com/
This site gives instructions for repairing F11 and recommends checking the temperature probe and tells how to do it.
How to fix Frigidaire oven error code F10 F11 F30 F31 etc AskGene com
Clear the lock mechanism -- as indicated by the DOOR LOC light -- by pressing and holding in the oven door light switch for 20 to 30 seconds. While the switch is depressed, the latch motor will gradually withdraw the lock, allowing you to open your oven door.
