Epson WF-2660-2661-2665 Error 0x21 Epson WF-2660-2661-2665 Error Code 0x21: Scanner Issue, Description, and Troubleshooting If you encounter the error code 0x21 on the scanner display of your Epson WF-2660, WF-2661, or WF-2665 printer, it indicates a problem with the scanning functionality. This error is specifically related to the ALD (Automatic Document Feeder) PID (Positioning Identification)…