: The physical lock switch on the SD card may be in the "Locked" position.
This is the easiest potential fix. Remove the SD card from the controller and look at its left side. You should see a small, sliding "Lock" switch.
Rapid cycling can cause "bit rot" or file system corruption. 💾 Recommended SD Card Specifications
"Quick Format" to allow the system to check for bad sectors. Click Start . ⚠️ When to Call a Technician kaeser sd card write error top
The Sigma Control system requires a deeper master firmware flash that can only be done via proprietary Kaeser service tools (like Sigma Control Smart).
SD card write error (often designated as error 0300 W on Kaeser Sigma Control 2 systems) is a warning message indicating that the controller is unable to save operational data to the memory card. While this error typically doesn't shut down the compressor immediately, it prevents the system from logging events and makes software updates impossible. Primary Causes and Solutions According to Kaeser service manuals , the error generally stems from three main issues: Write Protection
: If the card is readable on a PC but not the controller, verify it is formatted to the correct file system (typically FAT32). Replace with Genuine Parts : The physical lock switch on the SD
: Attempt to reformat the card or use a specialized tool like the Official SD Memory Card Formatter to ensure the partition table is correct. How to Acknowledge the Error Navigate to the Messages menu using the scroll keys.
Press the key to clear the message and reset the alarm memory, provided the underlying issue has been resolved.
If the switch wasn't the issue, contamination might be blocking the signal. Eject the SD card again. You should see a small, sliding "Lock" switch
This error indicates that the controller has detected a fundamental problem with reading from or writing data to the inserted SD card. It is a serious error because the controller relies on stable data storage to operate correctly. The action to take for this error, as specified by Kaeser, is to to resolve it.
The SD card slot on the SIGMA CONTROL 2 is not an optional extra; it is a core component of the controller's functionality. Understanding why the controller uses an SD card is key to troubleshooting. As documented on Kaeser's official product page, the SD card slot is the primary interface for:
At this point, you should contact an authorized Kaeser service representative. Before calling, have the following information ready:
Understanding why the Sigma Control 2 rejects write commands helps narrow down the solution quickly:
