Stihl Intermittent Safety Sensor Activation

Robot lawnmower sometimes stops in the middle of the lawn with no error code, then resumes later.

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

Possible Causes

Loose hood or bumper, Sensitive tilt sensor on uneven ground, Intermittent lift sensor contact, Vibration-related wiring issue

Safety first: Turn the mower OFF before inspection.

Check hood fit: Ensure the front hood is properly latched and not rattling. Tighten any loose fasteners.
Inspect sensors: Gently move the hood and lift points to see if the mower reacts unexpectedly when powered ON in test mode (if available).
Smooth rough areas: Fill in deep ruts or holes that may cause sudden tilting.

If unexplained stops continue, have a technician inspect the wiring harness and sensor inputs on the main PCB.

Medium 3/5

Lift and Collision Sensor Assembly

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