The user interface of v3800 is clean. While newer tools try to do too much (firmware updates, head alignment), v3800 focuses on the job at hand. Under the "Main" tab, you simply check "Clear Waste Ink" and click "Set." The machine chatters for 10 seconds, and the error is gone.
Canon officially distributes this tool only through official service channels . Using third-party versions can void your warranty. How to Use (Standard Workflow)
: Triggers diagnostic test pages to verify printer health and port connectivity. Compatibility