Canon Printer Error Code C000 occurs due to an internal error in your printer. But apart from it, there are many other plausible reasons which are responsible for causing Canon printer error code C000. Some of the preeminent reasons are: When you don't remove the entire packaging material. When your ink cartridge is not seated properly in its slot. When there is a hurdle or blockage in the path of the paper feeder. When the ink cartridges are empty.