4
Flash Memory Write Error
Wago · PFC200 PLC
What does 4 mean?
An error occurred during an attempt to write data to the controller's flash memory. This can lead to corrupted configuration or program data and indicates a critical issue with the flash memory hardware or its write operations. This is a severe internal controller fault.
Common Causes
- Defective flash memory hardware within the controller
- Interrupted or failed write operation to flash memory due to an internal fault
- Controller internal fault during memory access causing write failures
Repair Steps & Checklist
Click steps to track your progress.
- 1
Switch off the power to the controller.
- 2
Replace the controller.
- 3
Switch the power back on after replacement.
Verified technical data. Last updated: March 2026
Related Faults
Source: Wago PFC200 PLC