Cooling fan runs, but the oven remains locked, and the error persists after a pyrolytic cycle.

Safety first: Ensure the oven is completely cool before attempting any work. Disconnect it from mains power.

• Allow extended cooling: Leave the oven door slightly open (if possible) and allow several hours for internal thermostats to reset.
• Check safety thermostats: Access the rear and top of the oven to locate manual-reset thermostats (small, round devices with a reset button). Press the reset button if present.
• Inspect door lock: From the top/front, check that the lock mechanism is not jammed in the locked position. Manually move the lock lever to the unlocked position if accessible.
• Power reset: After ensuring thermostats are reset and the lock is free, restore power and check if the error clears.
• Replace faulty components: If a thermostat will not reset or tests open permanently, replace it. If the lock motor does not move during lock/unlock commands, replace the door lock assembly.

Note: Frequent pyrolytic cycles can stress thermostats and locks; ensure adequate ventilation around the oven installation.