Cause

Printer error has occurred.
 

What to Do

Turn off printer and unplug it.

Plug in the printer again and turn it back on.

If this does not solve the problem, service is required.

For support and service options, sign into (or create) your Canon Account from the link below.
My Canon Account

 If you unplug the power cord, all the faxes stored in the printer's memory are deleted.