Oven beeps and shows F09, often when using pyrolytic self‑cleaning or high‑temperature modes.

Safety first: Disconnect power. If the door is locked with food inside, allow the oven to cool fully; forcing the door can cause damage.

• Check door movement: With power off, gently try to move the door. If it is mechanically jammed, inspect the latch hook on the door for bending or obstruction.
• Access lock assembly: Remove the top cover or front panel (depending on model) to access the door lock motor and latch mechanism.
• Inspect linkage: Check that the lock arm moves freely and is not obstructed by insulation or bent metal. Lubricate lightly with high‑temperature‑rated lubricant if stiff (avoid excess).
• Microswitch test: Identify the lock position microswitch(es). Test for continuity in locked and unlocked positions with a multimeter. Replace the lock assembly if the switches do not change state reliably.
• Motor/solenoid test: With the oven disconnected, measure the resistance of the lock motor/solenoid coil. An open circuit indicates a failed coil and the lock assembly must be replaced.
• Wiring check: Inspect the harness from the lock to the control board for damage or loose connectors.