Robot vacuum is very loud during operation; noise is higher than usual or includes rattling or grinding sounds.

Safety first: Turn the robot OFF before inspecting moving parts.

Steps:

• 1. Isolate noise source: Run the robot briefly and listen to determine if the noise comes from the brush area, wheels, or suction motor. Then turn it off.
• 2. Inspect main brush: Remove the brush roll and clean hair and debris from the bristles and end caps. Spin the brush by hand; if it feels rough or noisy, replace it.
• 3. Check wheels: Rotate each drive wheel and caster wheel by hand. Remove any debris and ensure they spin smoothly.
• 4. Check for loose parts: Gently shake the robot (powered off) and listen for loose internal parts. If you hear rattling from inside the housing, stop using the robot.

When to call a technician: Persistent loud or grinding noise, especially from the suction motor area, indicates worn bearings or a damaged fan. Internal motor replacement should be done by a professional.