Robot vacuum leaves hair and debris along walls and in corners; edge cleaning is poor.

Safety first: Turn off the robot and flip it over on a soft surface.

Steps to resolve:

• Inspect side brush: Ensure the side brush is present, not missing bristles, and not bent out of shape.
• Clean hub: Remove the side brush screw, pull off the brush, and clear hair and debris from the shaft and underside.
• Reinstall securely: Reattach the side brush and tighten the screw snugly (do not overtighten).
• Test motor: Start a cleaning cycle and observe whether the side brush spins. If it does not, the motor may be faulty.

When to replace parts: Replace the side brush if damaged. If the motor does not spin even with a good brush, replace the side brush motor module.