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Mechanical equipment (Fxx)

Mechanical equipment (Fxx) - Issue with chain brake or motor

Stihl · Power Tools

What does Mechanical equipment (Fxx) mean?

This code group indicates a problem related to the mechanical operation of the tool, specifically the chain brake or the force required by the motor.

Common Causes

  • Chain brake mechanism is defective
  • Excessive force required during operation
  • Electric motor issues

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Inspect the chain brake lever and its components for damage.

  2. 2

    Check the brake band and tension spring for wear or damage.

  3. 3

    Ensure the cutting attachment is not binding and moves freely.

  4. 4

    Refer to the specific troubleshooting flow charts for F30-F34 or F35.

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 149)Search more codes in this manual