Stihl · Power Tools
This error message indicates a problem with the motor's electrical lead or the motor itself. Issues can include disconnection, short circuits, or abnormal resistance.
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Check the motor lead connection to the motor and the electronics for looseness or damage.
Inspect the wiring for any signs of short circuits or abrasion.
Test the resistance of the motor according to the technical information.
Refer to the specific flow chart for 'Motor lead / motor' diagnostics.