Smeg oven pyrolytic self-clean cycle does not start or stops early without an error code.

Safety first: Ensure the oven is empty of racks and accessories as required by Smeg before starting pyrolysis.

• Check door lock: Confirm that the door lock engages and the door is fully closed. Listen for the lock motor at the start of the cycle.
• Correct setup: Select the correct pyrolytic program and duration as per the user manual. Ensure the clock is set.
• Ventilation and cooling fan: Verify that the cooling fan runs during the cycle and that cabinet ventilation is adequate.
• Thermostat and sensor: If the cycle stops early repeatedly, the safety thermostat may be tripping. Have the thermostat and high-temperature sensor tested and replaced if necessary.