The "F9" error code means the EOC (electronic oven control) has found the lock motor switches to be out of sequence or shorted.
Check the switches and the wire harness from the door lock to the EOC.
If there is nothing wrong - replace the EOC.
- The part number for the door latch assembly is
AP3184578
- The part number for the door latch harness is
AP3792531
- The part number for the EOC is
AP3792535
Gene.