Robot vacuum reports E2 and stops; it may say the bumper is stuck or front bumper error.

Safety first: Power the robot OFF and remove it from the charging base.

Step-by-step:

• Free the bumper: Gently press the front bumper in and release it several times. It should move freely and spring back evenly across the entire width.
• Remove debris: Inspect the gap between the bumper and the main body. Use a flashlight to look for lodged objects (toys, cables, carpet fibers). Remove debris with tweezers or compressed air.
• Check bumper travel: If one side moves less than the other, a spring may be dislodged. Carefully pull the bumper outward slightly and see if it re-centers. Do not force it.
• Reboot and test: Turn the robot back on and start a cleaning cycle. Lightly tap the bumper to confirm it triggers and releases.
• Internal inspection (advanced): Remove the top or front cover (model dependent) to access the bumper switch board. Verify that the micro-switches click when the bumper is pressed and that the wiring harness is firmly connected to the main PCB. Replace the bumper switch assembly if switches are broken or the board is cracked.

When to stop: If the bumper is physically damaged or the error persists after cleaning and reseating connectors, replacement of the bumper assembly is recommended.