9

Over-heat of Control Module (ECM)

Fanuc · A20B-2101-0390 αi 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.

Repair Steps

  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
Source: Fanuc A20B-2101-0390 αi series AC Servo Motor and Spindle