Stihl · Power Tools
This error points to a problem with the tool's main wiring harness. This could be a faulty connection or excessively high electrical resistance within the harness.
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Inspect the wiring harness and its connection points for any signs of damage or corrosion.
Check for proper seating of the harness at all connection points.
Test the resistance of the wiring harness according to the flow chart in the technical information.
If the harness is damaged, it will need to be replaced.