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3 or 4 flashing red LED or no LED function (AI/AK Series)

3 or 4 flashing red LED or no LED function - Problem in the unit (AI/AK Series)

Stihl · Power Tools

What does 3 or 4 flashing red LED or no LED function (AI/AK Series) mean?

This indicates a problem within the tool itself, not necessarily the battery or charger. Troubleshooting is required to identify the specific component at fault.

Common Causes

  • Issue with the tool's motor
  • Faulty switch or internal wiring
  • Problem with the control electronics

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Visually inspect the unit for any obvious damage or loose connections.

  2. 2

    Ensure the battery contacts inside the tool are clean.

  3. 3

    If the tool has a trigger switch, listen for an audible click when pressed.

  4. 4

    Refer to the diagnostic steps for your specific AI or AK series tool for further troubleshooting.

Browse all codes in this manual (35)
Verified technical data. Last updated: April 2026

Related Faults

1 glowing red LED1 glowing red LED - Battery too hot or too cold1 glowing red light1 glowing red light — Battery too hot or too cold3 flashing red LED (AK Series)3 flashing red LED - Internal electronic issue (AK Series)
Source: Stihl Power Tools
Open Manual (Page 118)Search more codes in this manual