The Canon Pixma G3400 error code B200 then it will indicate the faulty print head. A print head is a part that distributes the ink from cartridge onto the paper that means it is one of the most critical aspects of the entire printer. The best part to troubleshoot the issue is by resetting the printer. For this, unplug it and leave it disconnected for at least 30 minutes. A long reset allows the printer to smoothly cool down and then restore everything to proper position before turning the device back on. These are the steps that users need to follow to resolve Canon printer error code B200.