3
Unknown Flash Program Memory Module Type
Wago · PFC200 PLC
What does 3 mean?
The controller has encountered an unknown module type for its internal flash program memory. This suggests an issue with the controller's fundamental hardware or firmware related to memory access. This typically points to a defective controller that cannot properly identify its own memory.
Common Causes
- Controller firmware corruption regarding flash memory identification
- Defective flash program memory module within the controller hardware
- Incompatibility between controller firmware and installed flash memory
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