Oven overheats or shuts down with F03 error, sometimes accompanied by strong heat and smell of hot metal.

Safety first: Turn off power at the breaker and allow the oven to cool completely before working on it.

• Check ventilation: Ensure the oven has correct ventilation gaps in the cabinet as per Bauknecht installation instructions. Remove any obstructions blocking air inlets or outlets.
• Inspect cooling fan: Remove the top cover to access the tangential cooling fan. Spin the fan by hand; it should rotate freely. Check for grease build‑up or foreign objects. If the fan is seized or noisy, replace it.
• Test fan operation: Restore power briefly and start a heating program while observing (from a safe distance) whether the cooling fan starts after a short delay. If it does not, check the fan wiring and connector to the control board. If wiring is good, the fan motor or control board output may be faulty.
• Reset or replace safety thermostat: Locate the safety thermostat (usually clipped to the top of the oven cavity or rear). Some models have a manual reset button on the thermostat; press it firmly to reset. If it trips repeatedly or has no continuity when cool, replace it.
• Check for stuck relay: If the oven continues heating even when switched off, the heater relay on the control board may be welded closed. In this case, replace the main electronic control board.