Robot mower displays E13 and behaves erratically near the boundary; sometimes crosses the wire.

Safety first: Turn OFF main power before opening the mower housing.

• Reduce interference: Ensure no high‑voltage cables, electric fences, or buried power lines run close and parallel to the boundary wire. If they do, reroute the boundary wire further away.
• Inspect sensor area: The boundary sensor coil is usually located at the front of the mower. Check for physical damage to the front underside and sensor bracket.
• Check sensor wiring: Open the housing and trace the Boundary Sensor Harness from the front coil to the Main Control Board. Confirm the connector is secure and wires are not cut or pinched.
• Test in a simple loop: Create a small test loop of boundary wire near the station and see if the mower can detect and follow it. If E13 persists, replace the Boundary Sensor Coil Assembly.