Robot lawnmower displays E3 and stops; wheels may twitch but mower does not drive.

Safety first: Turn OFF the main power switch and unplug the charging station. Wear gloves to avoid cuts from blades or sharp plastic.

• Inspect wheels: Check both drive wheels for trapped branches, stones, or heavy grass buildup. Remove debris with a brush and small tool. Ensure the wheels rotate freely by hand.
• Check wheel height and chassis: Make sure the mower is not scraping the ground or stuck on uneven terrain, edging stones, or tree roots. Adjust cutting height and boundary wire layout if the mower frequently hangs up.
• Test drive motors: With the mower upside down and power OFF, gently rotate each wheel. If one side feels rough or locked, the gearbox may be damaged.
• Power cycle and test: Turn power ON, place the mower on a flat area, and start a manual drive test if available in the menu. If E3 returns immediately, the affected drive motor or the motor driver circuit on the mainboard may need replacement.
• Professional service: Replacing drive motors on Einhell robot mowers usually requires opening the housing and disconnecting wiring harnesses; if you are not comfortable with this, contact an authorized service center.