Robot lawnmower occasionally fails to detect the boundary and crosses outside the mowing area without showing an error code.

Safety first: Turn OFF the mower and disconnect power to the charging station before adjusting the boundary wire.

• Check wire depth: Ensure the NAC boundary wire is no deeper than the recommended depth (usually surface‑laid or shallowly buried). Raise it closer to the surface if necessary.
• Shorten loop if possible: Avoid unnecessary detours in the boundary layout that increase total wire length and reduce signal strength.
• Separate from other cables: Keep the boundary wire at least 30 cm away from mains or communication cables.
• Test mower sensor: Place the mower directly over the boundary and observe if it reacts consistently. If not, the internal boundary sensor coil or associated electronics may need replacement.

Warning: Do not twist or bundle boundary wire with other cables; this can severely distort the signal.