Robot vacuum shows F8 and stops; may occur when turning or navigating around furniture.

Safety first: Turn the robot OFF and remove it from the dock before touching the side brush.

Steps:

• 1. Remove side brush: Turn the robot upside down. Unscrew or pull off the side brush (depending on model). Remove hair, threads, and debris from the hub and shaft.
• 2. Inspect brush and mount: Check the side brush for bent or broken arms. Inspect the mounting post for damage or excessive play.
• 3. Test motor manually: With the brush removed, gently rotate the motor shaft with your fingers (if accessible). It should turn smoothly. If it is seized, the motor or gearbox is likely defective.
• 4. Reinstall and test: Refit the side brush securely. Power the robot on and start a cleaning cycle, watching whether the side brush spins normally.

When to call a technician: If F8 persists and the side brush does not spin or makes grinding noises, the side brush motor assembly may need replacement. This typically requires opening the housing and should be done by a professional.