Oven displays F9 and the door may remain locked or unlocked incorrectly, often after a self-clean cycle.

Safety first: Turn off power at the breaker. The door lock mechanism can move unexpectedly; keep fingers clear of moving parts.

Step-by-step checks:

• Allow cooling: If F9 occurred during or after self-clean, wait until the oven is completely cool; the lock may release automatically.
• Inspect latch: Check the door latch hook on the oven front for bending or obstruction. Ensure the door closes fully and aligns with the lock.
• Access lock assembly: Remove the top panel or rear panel to access the door lock motor assembly (usually at the top front of the oven).
• Check lock motor: Inspect for broken plastic gears or linkage. Manually move the lock arm to verify it is not seized.
• Test switches: Use a multimeter to test continuity of the lock position switches while manually moving the lock. Replace if they do not change state.
• Check wiring: Inspect the harness from the lock assembly to the control board for breaks or heat damage.

When to replace parts: Replace the door lock motor assembly if the motor or internal switches are faulty. If the lock works mechanically but the board does not sense it, the control board may need replacement.