F9 error code?

Alarm beeps and F9 error code on oven display.

Its a kenmore branded range (but its actually made by Frigidaire) burners still work during alarm. The error codes page on this site only goes up to F8 anyone know what F9 is??? Had to unplug after 20mins of alarm beeping, need to know how to silence alarm and diagnose issue.

Here are your parts
Parts for Kenmore Range 79095300104 - AppliancePartsPros.com

the Sears parts site has actual part breakdowns, unfortunately they do not share them with other part vendors.

Here is the wiring diagram
http://manuals.frigidaire.com/prodinfo_pdf/Springfield/316255173.pdf

Here is a manual. You will have to join the site to be able to download the manual.
http://appliancejunk.com/forums/index.php?action=downloads;sa=downfile&id=283;t=1371031931

Looks like F9 is related to the door lock assembly.
I would start by checking the door switch.