Canon PIXMA MG6821 User Manual - Page 960

"No ink"/"Ink cassette Check the support code on the touch screen and take the appropriate action to resolve the error" error. List of Support Code for Error "Ink Error" Check the support code on the touch screen and take the appropriate action to resolve the error. List of Support Code for Error "Hardware Error" Check the support code on the touch screen and take the appropriate action to resolve the error. List of Support Code for Error "Printer error" An error requiring servicing may have occurred. Turn off the machine and unplug it. Plug in the machine again and turn it back on. If this does not solve the problem, contact your nearest Canon service center to request a repair. 960