Oven makes loud rattling or grinding noise when the fan is running.

Safety: Disconnect power before accessing the fan.

• Identify noise source: Run the oven briefly (if safe) to confirm whether the noise is from the rear convection fan or the top cooling fan.
• Access fan: Remove the internal rear panel to access the convection fan blade. Check for loose screws or debris.
• Tighten blade: Tighten the central nut holding the fan blade to the motor shaft.
• Check bearings: Spin the fan by hand. Roughness or play indicates worn bearings; replace the fan motor.
• Cooling fan: If the noise is from the top, access the tangential cooling fan and check for loose mounting or debris. Replace if noisy.