Loud rattling or scraping noise from the rear of the oven when the fan is running.

Safety first: Disconnect power before removing internal panels.

• Access fan: Remove the rear panel inside the cavity to expose the fan.
• Remove debris: Check for screws, foil, or food pieces caught in the fan blades. Remove any obstructions.
• Tighten fan nut: Ensure the fan blade is securely fastened to the motor shaft. Tighten the retaining nut if it is loose.
• Check for wobble: Spin the fan by hand. If it wobbles or scrapes the shroud, straighten or replace the fan blade.
• Replace noisy motor: If the noise is from inside the motor (grinding or squealing), replace the convection fan motor.

Tip: Do not bend blades excessively; imbalance can cause further noise and wear.