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ErrorLib — Industrial Fault Code Library

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6

Inverter Overheat

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

What does 6 mean?

This alarm indicates an overheat condition within the Inverter (Servo Amplifier). Potential causes include motor overload, inadequate cabinet cooling, high ambient temperature, or improper seating of the control printed-circuit board, all of which can lead to thermal stress on the amplifier.

Common Causes

  • Motor operation exceeding its continuous rating.
  • Insufficient cooling capacity within the cabinet (e.g., clogged filters, failed fans).
  • Ambient temperature exceeding operational limits.
  • Faceplate (control printed-circuit board) not fully seated.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Check that the motor is being used at or below its continuous rating.

  2. 2

    Inspect the cabinet cooling fans and filters to ensure sufficient cooling capacity.

  3. 3

    Verify that the ambient temperature is within acceptable operating limits.

  4. 4

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

  5. 5

    Replace the Servo Amplifier if all other checks are satisfactory.

Browse all codes in this manual (38)
Verified technical data. Last updated: April 2026

Related Faults

1Inverter Internal Cooling Fan Stopped2Inverter Control Power Supply Undervoltage366PULSE MISS(INT)
Source: Fanuc Series 30i/31i/32i-MODEL B Plus
Open Manual (Page 93)Search more codes in this manual