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F9 error code is a problem with the door lock safety circuit.
You can try unplugging the oven or turning off the breaker this may release the lock which is controlled by a micro switch. f this does not work with the power off use shine a light through the slot where the lock is in the oven, not the door, you may be able to use something thin to move the lock to the release position. check the lever and make sure its not bent or croooked as this can cause the error as well.
If the door lock circuit is operating properly you will need to replace the control board/clock.
You did not leave your model number if you would like to send it to me I would be glad to find you the part and part numbers in case you need them.
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