Robot mower shows E06 and stops; often occurs when reversing or turning near obstacles.

Safety first: Turn OFF the mower and remove the battery connector before working on the bumper assembly.

• Check bumper movement: Press the front bumper in and release it along its full width. It should move freely and spring back without sticking.
• Clean around bumper: Remove grass, mud, or stones lodged between the bumper and chassis that may hold it in the pressed position.
• Inspect bumper switches: Remove the front cover to access the bumper microswitches or sensor bar. Ensure they are firmly mounted and actuated when the bumper is pressed.
• Check wiring harness: Follow the bumper sensor cable to the main control board. Look for broken wires, loose connectors, or corrosion.
• Reset and test: Reassemble, reconnect the battery, clear the error, and gently push the bumper by hand while the mower is in test mode (if available) to confirm proper detection.

If E06 persists with a free-moving bumper and intact wiring, the bumper sensor assembly or the main control board input may be defective and require replacement.