738 Log file could not be saved - USB stick write protection or full memory.

What does 738 mean?

A warning message indicates that the inverter could not save a log file to the USB stick. This usually happens if the stick is write-protected or its memory is full.

• USB stick is write-protected.
• USB stick is full and has no free memory.
• Corrupted USB stick.

Click steps to track your progress.

1. 1

   Remove any write-protection from the USB stick.

2. 2

   Free up memory on the USB stick by deleting old files or replacing it with a new one.

3. 3

   Check the USB stick for any physical damage or corruption. If the code persists, contact a Fronius-trained service technician.