You should not be concerned if your printer has gone down unexpectedly, showing the error Canon printer offline. There are a few troubleshooting techniques that you may use to attempt to resolve the problem on your own. We have included the tips below to assist you in doing the same. Ascertain that both the printer and the router are linked through the Ethernet wire. Conduct a network configuration audit. Assess that both the printer and the computer are linked correctly through USB cords. Check and see to it that the power wires are securely attached to the power socket.