Robot mower displays E11 and stops, often when reversing or turning.

Safety first: Turn OFF the mower and remove it from the lawn. Place it upside down on a stable surface.

• Locate encoders: On most LandXcape models, the wheel encoders are integrated near the drive motors or wheel hubs. Remove the wheel cover or side panel as needed.
• Clean encoder area: Use a soft brush and compressed air to remove grass and dust from the encoder disc and sensor. Avoid bending the disc.
• Inspect for damage: Check the encoder disc for cracks or missing segments. Inspect the sensor for physical damage or misalignment.
• Check wiring: Follow the encoder cable to the main board. Ensure the connector is secure and the cable is not cut or pinched.
• Test run: Reassemble and run the mower in a small area. If E11 recurs on one side only, replace the affected LandXcape wheel motor/encoder assembly or the separate encoder sensor if available.
• Main board: If both encoders and wiring are good, the main PCB's sensor input may be defective and require replacement.