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ErrorLib — Industrial Fault Code Library

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I/O-LED 1-4

Fault during writing into the flash memory (Fault code 1, argument 4)

Wago · Modular I/O System PROFIBUS DP

What does I/O-LED 1-4 mean?

An error occurred while the Fieldbus Coupler was attempting to write data into its internal flash memory. This suggests a defect in the flash memory component itself or a power instability that interrupted the write operation, potentially corrupting stored firmware or configuration.

Common Causes

  • Defective flash memory component within the coupler
  • Power fluctuations or interruptions during flash memory write operations

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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