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F05

F05 - Control electronics issue / power levels not detected

Stihl · Power Tools

What does F05 mean?

The control electronics are not correctly detecting the power levels or are otherwise malfunctioning. The display of power levels may also be defective.

Common Causes

  • Faulty control electronics module
  • Issues with sensors that detect power levels
  • Software or calibration problems within the electronics

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Test the control electronics according to the flow chart in the technical information section.

  2. 2

    Ensure that any associated sensors are clean and properly connected.

  3. 3

    If the electronics are suspected to be faulty, they may need to be replaced.

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 150)Search more codes in this manual