9

Over-heat of Control Module (ECM)

Fanuc · Alpha i Series AC Servo Motor and Spindle

What does 9 mean?

The Control Module of the ECM has detected an abnormal temperature, indicating overheating. This can be caused by poor ventilation, excessive load, or a fault in the module itself.

Common Causes

  • The internal temperature of the control module exceeds its safe operating limit.
  • Inadequate cooling or ventilation of the control module enclosure.
  • Overload condition causing the module to generate excessive heat.
  • Fan failure within the control module or enclosure.
  • Ambient temperature is too high for the system's design.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Verify the cooling fan of the Control Module is operating correctly and not obstructed.

  2. 2

    Check the ambient temperature inside the cabinet where the ECM is installed.

  3. 3

    Inspect the heat sink of the Control Module for dust accumulation or blockages.

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Verified technical data. Last updated: March 2026

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Source: Fanuc Alpha i Series AC Servo Motor and Spindle