Hansa oven shows E12 and shuts down when using pyrolytic self-cleaning (on models with pyrolysis).

Safety first: Allow the oven to cool completely and disconnect power before inspection.

• Check ventilation and cooling: Ensure that the oven's cooling vents are not blocked and that the cooling fan operates correctly during normal baking. Blocked airflow can cause overheat trips during pyrolysis.
• Inspect pyrolytic sensor and thermostat: On pyrolytic Hansa models, there is often a dedicated high-temperature sensor or thermostat. Access the top/rear of the oven and locate these components. Test for continuity (thermostat) or correct resistance (sensor) with a multimeter. Replace any open or out-of-spec parts.
• Resettable thermostats: Some safety thermostats have a manual reset button. If present, press it gently to reset after cooling.
• Control board: If sensors and thermostats are good, the control board may be mismanaging the pyrolytic cycle and require replacement.

When to call a technician: Pyrolytic systems operate at very high temperatures; incorrect repair can be hazardous. Professional service is recommended for E12 faults.