The following are the main reasons why your Canon Printer not responding:

• 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 fluctuating.
• 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.