Display shows F9 and the oven door will not lock or unlock during self-clean, or self-clean will not start.

Safety first: Turn off power at the breaker before working on the door lock system. The door may be hot if self-clean was recently used; allow it to cool completely.

• Check door alignment: Ensure the oven door closes fully and evenly. A sagging or misaligned door can prevent the latch from engaging the lock switch.
• Listen for lock motor: When starting self-clean (with power on), listen for the door lock motor running. If you hear no movement, the lock motor or control may be faulty.
• Access door lock assembly: With power off, remove the top or rear panel (depending on model) to access the door lock motor and latch assembly. Inspect for broken plastic parts, bent linkages, or disconnected rods.
• Test lock switch: Locate the micro-switch on the lock assembly. Using a multimeter, check for continuity when the latch is in the locked position. Replace the door lock assembly if the switch does not change state.
• Manual unlock (if stuck closed): With power off, gently move the lock arm or rod to release the door. Do not force the latch; use the mechanical release tab if provided by the design.

Because the lock system is tied to safety interlocks, replacement of the entire door lock assembly is often recommended rather than individual switch repair.