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ErrorLib — Industrial Fault Code Library

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I/O-LED 1-3

EEPROM checksum fault (Fault code 1, argument 3)

Wago · Modular I/O System PROFIBUS DP

What does I/O-LED 1-3 mean?

A checksum error has been detected in the EEPROM (Electrically Erasable Programmable Read-Only Memory) of the Fieldbus Coupler. This indicates data corruption in the non-volatile memory where crucial configuration or firmware data is stored, likely due to a hardware defect in the EEPROM component.

Common Causes

  • Corrupted data in the coupler's EEPROM
  • Hardware defect of the EEPROM component itself

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Replace the Coupler.

Browse all codes in this manual (21)
Verified technical data. Last updated: April 2026

Related Faults

BUS-LED 1-1Insufficient configuration data (Fault code 1, argument 1)BUS-LED 1-2Excessive configuration data (Fault code 1, argument 2)BUS-LED 2-nFaulty configuration byte n (Fault code 2, argument n)
Source: Wago Modular I/O System PROFIBUS DP
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