601

External Radiator Fin Cooling Fan Stopped

Fanuc · αi series AC Servo Motor

What does 601 mean?

This alarm is issued when the fan motor responsible for cooling the external radiator fin of the inverter has failed. This fan is a consumable part. Failure can lead to inverter overheating and potential damage if not addressed.

Common Causes

  • Fan motor for inverter radiator has failed
  • Fan clogged with foreign matter
  • Power connector of the fan is improperly connected

Repair Steps

  1. 1

    Check that the fan is not clogged with foreign matter

  2. 2

    Check that the power connector of the fan is connected properly

  3. 3

    Replace the fan or the entire servo amplifier module

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Verified technical data. Last updated: March 2026
Source: Fanuc αi series AC Servo Motor