Oven makes rattling, buzzing, or grinding noises during operation.

Safety first: Disconnect power before accessing any fan assemblies.

Steps to try:

• Identify source: Note whether the noise occurs only when convection is on, only during preheat, or throughout operation.
• Check convection fan: Remove the rear interior panel of the oven to access the convection fan. Look for loose screws, warped blades, or debris. Tighten and clean as needed.
• Inspect cooling fan: From the rear or top, access the cooling fan. Spin the blade by hand; roughness or wobble indicates worn bearings. Replace the fan motor if noisy.