Some versions claim Wi-Fi support, but USB is far more reliable. Do not attempt Wi-Fi resets – failure rates are high.
| Error in program | Likely cause | Solution | |----------------|--------------|----------| | “Communication error” | Printer not in ready state | Turn printer off/on, re-enter adjustment mode | | “Model mismatch” | Wrong driver installed | Reinstall Epson L121 driver | | “Timeout” | USB interference | Use another USB port, disable power saving on USB | | “Checksum error” | Corrupted program | Redownload from a different source | | “Reset failed” | Counter already at zero | No action needed – error was not waste ink related | adjustment program for epson l121
For a long-term fix, consider installing an external waste ink tank or manually cleaning the sponges if you are comfortable with basic hardware maintenance. Some versions claim Wi-Fi support, but USB is