This solution is for ALL Canon Printers. It should work whether you have an existing printer that has suddenly disappeared from your wi-fi network, or whether it is a new printer that you are trying to connect. The error message is pretty much the same: "The printer is offline. Check that the printer is connected and the printer power is on." So we are going to reinstall and reset all in one go here.
I recommend you give this solution a go before you faff around with suggestions out there - you know what I mean: Turn it on and off, reset your network, mess around with your device manager, troubleshooting, restart spoolers, clearing print jobs, re-setting the printer etc etc.
Let me know how you get on!