Robot vacuum shows E3 and stops near obstacles; often accompanied by a prompt about bumper or collision sensor error.

Safety first: Turn off the robot and remove it from the dock.

• Check bumper movement: Gently press the front bumper in and release. It should move freely and spring back evenly across its width. If it sticks, inspect the gap between the bumper and body for debris.
• Clean the bumper gap: Use a soft brush or compressed air to remove dust, crumbs, and hair from the bumper edges and underneath the lip.
• Clean collision sensors: Many Neabot models use IR sensors behind small windows on the bumper. Wipe these windows with a soft, dry microfiber cloth.
• Inspect for impact damage: Look for cracks or deformation in the bumper that might prevent full travel. If the bumper is bent or cracked, it may need replacement.
• Reset and test: Power the robot back on and start a cleaning cycle in an open area. If E3 persists, the internal bumper switch or sensor board may be faulty and require professional service.

Warning: Do not spray cleaners directly into sensor windows or bumper gaps; moisture can damage internal electronics.