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ErrorLib — Industrial Fault Code Library

Disclaimer: ErrorLib is an independent technical reference tool. While we aim for accuracy, always verify with the manufacturer’s official service manuals before performing maintenance on industrial equipment. ErrorLib is not affiliated with the brands listed.

9

Over-heat of Control Module (ECM)

Fanuc · Macro B CNC Programming

What does 9 mean?

The Energy Charge Module's (ECM) Control Module has detected an abnormal over-heat condition via its built-in thermostat. Continuous operation in this state can shorten the life of electronic components and degrade ECM performance, potentially leading to other failures.

Common Causes

  • Control module (ECM) temperature exceeds operational limit P1-80.
  • Cooling fan failure or obstruction for the ECM.
  • Excessive ambient temperature around the ECM.
  • High operational load causing increased heat generation within the ECM.
  • Blocked heatsink or ventilation on the ECM.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Immediately stop the machine using the emergency stop button and open the external Main Circuit Contactor (MCC) of the Power supply.

  2. 2

    Check the cooling fan of the Control Module (A06B-6158-H010) for proper operation and ensure it is not blocked by dust or debris.

  3. 3

    Verify that the ambient temperature around the Control Module is within the specified operating range (0 to 55°C, page 49).

  4. 4

    Ensure proper ventilation and air circulation within the power magnetics cabinet (Section G.2.3, page 460). Clear any obstructions.

  5. 5

    Inspect the heat sink of the Control Module for dust accumulation or damage, which can reduce cooling efficiency.

Browse all codes in this manual (26)
Verified technical data. Last updated: April 2026

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08Regeneration Excess Alarm1Over-current at Power Running (ECM)2Over-current at Regeneration (ECM)
Source: Fanuc Macro B CNC Programming
Open Manual (Page 588)Search more codes in this manual