Oven displays F90 and door will not lock or unlock during self-clean

Safety first: Disconnect power at the breaker. The door lock mechanism can move unexpectedly when power is restored.

• Try a reset: Turn power off for 5 minutes, then back on. Attempt to start and cancel a self-clean cycle to see if the lock resets.
• Access door lock assembly:
  • Remove the rear panel (for freestanding ranges) or top panel (for some wall ovens) to access the door lock motor and switches.
  • Inspect the lock rod and mechanism for binding, grease buildup, or bent parts. Free any obstructions.
• Test lock motor and switches:
  • With power off, disconnect the lock motor harness and check resistance across the motor terminals (typically a few hundred ohms). An open circuit indicates a bad motor.
  • Check continuity of the lock and unlock switches while manually moving the lock rod. Replace the assembly if switches do not change state.
• Replace assembly: If the motor or switches are defective, install a new door lock motor and switch assembly, reconnect wiring, and reassemble panels.
• Control board: If the lock assembly tests good but F90 persists, the EOC may not be driving the lock correctly. Replace the electronic oven control if needed.