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.
Select (for cards 2GB and under) or FAT32 (for cards up to 32GB) as the file system. Set the Allocation Unit Size to Default .
If you want, I can:
The usually manifests at the worst possible time. Unlike a sensor failure (which triggers a shutdown but lets you diagnose it), an SD card write error often attacks the brain of the compressor. The controller tries to log data, fails, and then enters a fail-safe state. kaeser sd card write error top
This clears the historical alarm memory cache if the write pathway is verified.
Longevity against thermal stresses and vibration degradation. Resetting the Warning Message
Disclaimer: Always consult your specific Kaeser manual and follow local electrical safety codes. If you are not a qualified electrician, hire a certified Kaeser technician. This is the easiest potential fix
While rare, the issue could be with the controller itself. The official Kaeser manuals list specific system messages that point to internal file system errors. Among these, is the one most related to a write error.
I can provide specific terminal steps or formatting instructions to match your configuration. Share public link
If you ignore this error, your Kaeser unit will continue to run, but you will lose historical trend data, and in some firmware versions, the unit may experience slow boot times or fail to save parameter changes. Select (for cards 2GB and under) or FAT32
: The physical lock switch on the side of the SD card is in the "Lock" position.
If formatting fails, you likely need a new card. To ensure compatibility, follow these specifications: The card must be formatted to FAT32 . Capacity: It requires a minimum of 50 MB of free memory.