Robot vacuum displays F11 and stops; may occur when the main brush engages or when moving onto carpets.

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

Steps:

• 1. Remove main brush: Turn the robot upside down. Open the brush guard and lift out the main brush roll.
• 2. Clean brush thoroughly: Cut away hair, threads, and fibers from the brush bristles and end caps using scissors. Remove any debris from the brush housing and suction channel.
• 3. Check end caps and bearings: Remove the end caps (if removable) and clean hair from the shafts and bearings. Ensure the brush spins freely when held by the ends.
• 4. Inspect for damage: Look for melted plastic, worn bearings, or a warped brush. Replace the brush roll if damaged or heavily worn.
• 5. Reassemble and test: Reinstall the brush and guard securely. Power the robot on and start a cleaning cycle, listening for smooth brush operation.

When to call a technician: If F11 persists and the brush is clean and spins freely by hand, the brush motor or gearbox may be failing. Professional replacement of the brush motor assembly is recommended.