Unit is unusually loud compared to previous operation, with a constant roaring or humming.

Safety first: Unplug before inspection.

• Clean fan and guard: Remove debris from the fan guard and blades.
• Straighten guard: If the guard is bent, carefully reshape it to its original form without contacting the fan.
• Tighten panels: Tighten screws on the outer housing to reduce vibration noise.
• Replace motor if needed: If the motor itself is loud or buzzing, replace the convection fan motor.