1

Inverter Internal Cooling Fan Stopped

Fanuc · Series 30i/31i/32i-MODEL B Plus

What does 1 mean?

This alarm indicates that the internal cooling fan of the Inverter (Servo Amplifier) has stopped operating. This can lead to overheating of the amplifier components and potential damage if not addressed.

Common Causes

  • Foreign material obstructing the internal cooling fan
  • Faceplate (control printed-circuit board) not fully seated
  • Internal cooling fan connector improperly attached
  • Internal cooling fan failure
  • Servo Amplifier failure

Repair Steps

  1. 1

    Check for any foreign material in the internal cooling fan.

  2. 2

    Ensure the faceplate (control printed-circuit board) is pushed in as far as it will go.

  3. 3

    Check that the internal cooling fan connector is attached correctly.

  4. 4

    Replace the internal cooling fan.

  5. 5

    Replace the Servo Amplifier if the fan and board seating checks do not resolve the issue.

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Verified technical data. Last updated: March 2026
Source: Fanuc Series 30i/31i/32i-MODEL B Plus