5

Flash Memory Erase Error

Wago · PFC200 PLC

What does 5 mean?

An error occurred during the process of erasing a sector of the controller's flash memory. This indicates a critical problem with the flash memory hardware or the controller's ability to manage its internal storage. This is a severe internal controller fault.

Common Causes

  • Defective flash memory sector within the controller
  • Internal controller hardware fault preventing flash erase operations
  • Power instability during critical memory erase operations

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Switch off the power to the controller.

  2. 2

    Replace the controller.

  3. 3

    Switch the power back on after replacement.

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Verified technical data. Last updated: March 2026

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