Oven door will not lock or unlock and F90 is displayed, often during self-clean

Safety first: Disconnect power at the breaker. The door and internal parts may be very hot if this occurred during self-clean; allow full cooling before working.

• Try a power reset:
  • Turn off power for 5–10 minutes, then restore.
  • Attempt to start and cancel a clean cycle to see if the lock cycles.
• Inspect door latch:
  • Check the door latch hook at the top/front of the oven for bending or obstruction.
  • Ensure no debris is blocking the latch from moving.
• Access lock motor assembly:
  • Remove the rear panel or top panel (depending on model) to access the door lock motor and latch assembly.
  • Visually inspect for broken plastic parts, disconnected rods, or burnt wiring.
• Test lock motor:
  • With power off, disconnect the lock motor connector.
  • Measure motor coil resistance (typically tens to hundreds of ohms; refer to tech sheet if available).
  • An open circuit indicates a failed motor.
• Check lock switches:
  • Many Kenmore locks have micro-switches to indicate locked/unlocked position.
  • Test continuity of each switch while manually moving the latch.
• Replace faulty parts:
  • Replace the door lock motor and latch assembly if motor or mechanism is defective.
  • If lock assembly tests good but F90 persists, suspect the electronic oven control (EOC).
• Manual door release (if stuck locked):
  • With power off and unit cool, remove the top panel and manually move the latch rod to release the door.