Stihl · Power Tools
This error message indicates that a switch within the tool is not being detected by the electronics, or the electronics are not functioning properly. This could be a wiring issue or a faulty switch.
Click steps to track your progress.
Inspect the wiring harness connection to the switch for any damage or looseness.
Verify that the switch itself is functioning correctly by listening for an audible click when pressed.
If the switch or wiring appears intact, the electronic module may require testing or replacement.
Refer to the flow chart for switch testing in the technical information.