Robot vacuum reports E2 and refuses to start or stops shortly after starting.

Safety: Turn the robot OFF and remove it from the dock before inspection.

• 1. Free the bumper:
  • Press the front bumper in and release several times. It should move freely and spring back.
  • Check for trapped objects (cables, toys, rug edges) between the bumper and the body. Remove any debris.
• 2. Clean collision sensors:
  • Locate the small IR windows along the front bumper (often dark plastic lenses).
  • Wipe them gently with a soft, dry microfiber cloth to remove dust and fingerprints.
• 3. Check bumper switches (advanced):
  • With the robot off, gently shake the bumper; listen for any loose parts.
  • If comfortable, remove the front cover screws and inspect the bumper microswitches and wiring harness.
  • Ensure the harness is firmly plugged into the main control board.
• 4. Test:
  • Power the robot back on and start a cleaning cycle on a flat, open floor.
  • If E2 reappears immediately, the bumper sensor assembly may be defective.
• 5. Next step:
  • Replace the bumper sensor assembly or contact a technician if you are not comfortable disassembling the front housing.