The error message Canon printer not printing can be caused by a variety of factors. The following are the main reasons why your Canon printer isn't printing:
• The print jobs are stalled in the queue at the printer. • Paper jams prevent the printer from printing. • The printer is unable to print due to faulty drivers or a lack of a wireless connection. • The printer's power is flickering. • The Canon printer and the mobile printing app are not in sync. • The printer firmware and firewall are not properly installed. • Canon printer drivers aren't updated on a regular basis.