Unplug the SRT tool, put the tool cover back on, and start the Hilti tool. The red service light should now be off. Common Tools Supported by Hilti SRT
Just visit your local Hilti center or call their service line—they will reset it for free while you wait. hilti srt service reset tool
While commonly referred to as a "reset tool," professional-grade SRT devices often perform a variety of diagnostic functions when connected to a tool's electronic control unit (ECU): Unplug the SRT tool, put the tool cover