PIXMA G7020 got error message 6004 after ink flush

[Nyanko36]

The black print became scratchy, so I did a deep clean, but that didn't help. After conducting an ink flush (there was enough ink), I heard a clicking noise and the printer stopped and displayed error code 6004.

I turned the printer off and unplugged it, then turned it on again, but the error message stayed.

What can I do?

[DerrickL]

What causes error 6004 in Canon PIXMA G7020 after an ink flush?

Error 6004 in the Canon PIXMA G7020 after an ink flush is typically caused by a clogged printhead or issues with the ink delivery system. It indicates that the printer is unable to properly deliver ink to the printhead, often due to air bubbles or blockages. You can turn it off, remove the power cable wait ten minutes and restart the printer. If this does not remedy the situation, you should talk to Canon tech support. 

https://www.usa.canon.com/contact-us/support