Stihl Inadequate Boundary Definition Around Obstacles

Robot lawnmower frequently gets stuck under bushes, garden furniture, or low obstacles.

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Possible Causes

Perimeter wire too close to low-hanging branches, No exclusion islands around furniture, Obstacles not recognized by bumper sensor

How to Fix / Troubleshooting

Safety first: Turn the mower OFF before adjusting the perimeter wire.

  • Re-route perimeter wire: Move the wire further away from low obstacles so the mower cannot physically reach under them.
  • Create islands: For fixed obstacles like trees or furniture, create exclusion islands by looping the perimeter wire around them as described in the Stihl installation guide.
  • Trim vegetation: Raise or trim low branches and shrubs so the mower can pass underneath without getting trapped.

After adjustments, observe the mower’s path to ensure it no longer becomes stuck in these areas.

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Repair Difficulty

Easy 2/5

Required Part

Perimeter Wire
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