Error code U163
Error code U163 means that your machine is prompting you to replace empty cartridges. If this message is displayed after inserting a new ink cartridge, you can remove this error code by carrying out the following instruction. On your Canon printer, find, press and hold down the STOP/RESET/RESUME button for 10 seconds. This lets the printer know you’re aware of the message but wish to continue printing anyway. You will be allowed to print as normal.