Canon imagePROGRAF TA-20 MFP 24" Large Format Printer with L24ei Scanner and Stand Kit - Manual (Page 926)

B510
Cause
A printer error has occurred.
What to Do
Make a note of the detailed error code (ECxx-xxxx) that appears on the touch screen, and then turn off
the power and unplug the power cord.
Contact your Canon dealer for assistance.
Detailed error codes
EC32-4001
926