Convection fan does not run in hot air modes; oven may overheat locally or cook unevenly; F09 displayed.

Safety first: Disconnect mains power and allow the oven to cool before working near the fan.

Step-by-step checks:

• Check fan rotation: With the oven off and cool, spin the convection fan blade by hand from inside the cavity. It should rotate freely without grinding noises.
• Access motor: Remove the rear panel to expose the fan motor. Inspect for signs of overheating or melted insulation.
• Test motor windings: Disconnect the motor and measure resistance across its terminals. An open circuit indicates a failed motor.
• Inspect capacitor (if present): Some motors use a start capacitor. A bulging or leaking capacitor should be replaced with the exact value specified.
• Replace fan motor: Remove mounting screws, detach the fan blade (note orientation), and install the new V-ZUG convection fan motor. Refit the blade and ensure it does not rub on the cover.

When to call a technician: If the motor tests good but F09 persists, the fan relay or control board may be faulty and should be checked by a professional.