Amana oven

Error F-9 means:Door lock safety circuit on ERC sensed Replace the door latch assembly

To solve this...Just press and hold the door latch to unlock position and then press cancel for a few seconds. The latch will return to its original position

This will probably fix it..but if doesnt work try this
Try unplugging the oven from the electrical power. May release the lock, which is held in place by a tiny micro switch. If not and while the electric is still off or the oven is unplugged, use a bright light flashlight to look through the slot where the lock is in the oven, not in the door.

You may be able to use a thin blade screwdriver to move the lock to the release position. Check the angle of the lever. A slightly bent lever handle also can cause this type of condition.

If all else fails, remove the access panel on the front of the oven to access the locking device and release it. May have to disconnect the wires to the lock which will allow door to function but not during any self cleaning modes.