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Error Code C000, help!

I have a Canon Pixma MG6620 printer that is giving the error code C000 anytime I attempt to print something. Can't find the issue, and could use some help.

Troubleshooting done so far:

Have taken off both side panels looking for any debris. Have also taken off paper tray and open the back panel looking for debris. Nothing found.

Reseated all ink cartridges, cleaned tray and contacts. Wiped down clear strip, checked to make sure tray moved without issue.

Hard reset the printer. Unplugged, waited 10 mins, plugged back in. Also tried resetting while holding power button before and after (a suggestion in another thread)

Reset all settings, reconnected wifi, checked for updates.

Went through all printer maintenance. Roller cleaning, bottom plate cleaning, etc. Paper feeds fine, but got same error code when I tried "Cleaning", and "Print head alignment"

I'm not sure what to check next. Everything looks clean/clear, but not sure what the issue is. If I can't get an answer here, my next step will be to just take the whole thing apart piece by piece and hope I find the problem.

The printer does make a sort of whirring noise that sounds like it made be motor or gear related. But paper feeds fine and print head moves fine.

Any help would be greatly appreciated. Thank you in advance!

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Reseated all ink cartridges, cleaned tray and contacts. Wiped down clear strip, checked to make sure tray moved without issue. Reset all settings, reconnected wifi, checked for updates.

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@nick do you have anything for the OP? It's AI (even a stylegan created profile image :-) against NI. Man against machine. Let's see if we can get the upper hand on here ;-)

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These Canons are designed with a printhead we can remove for inspection, unlike the later CLI-X tank models, where, sadly, they took notes on HP's final run of 564-based units on integrating that part. Given the printer's age, it's more of a wildcard than it was a few years ago, when it was usually the ink tank and not the head. Try to reseat the printhead first, clean it in hot water if need be and there's residual ink on the contacts inside the unit or the head contacts on the back. If the issue remains, try a complete set of ink tanks if the chips are dirty/intermittent, especially if you've reseated it a few times and the issue remains; could be a bad chip. It doesn't have to be OEM with Canon, but you WILL get nagged during the installation to clear the ink monitor alerts.

If that isn't it, check in the print mech for any loose paper and shreds that may be tripping the sensor; see here to see how to unjam this series. If there's no trace of paper in the path and you have checked multiple times (and confirmed the path isn't hiding anything!), the sensors may be at fault. It may or may not be easily repaired on this model; sometimes you can take the sensors out and clean them with isopropyl alcohol, and that's enough, but sometimes they're just shot.

Canon does say there may be leftover packing material... but given the age, this is probably doubtful at best. It's worth checking, but don't spend too much time on this.

The last thing you can try is to let it sit unplugged for ~5 minutes (which may very well be enough) but go for at least 30 minutes if you can to be sure. If this doesn't help, it's a major failure like the mainboard. Not worth fixing that.

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Since the issue persists despite your thorough troubleshooting efforts, it's likely that there's an internal hardware issue causing the error code C000 on your Canon Pixma MG6620 printer. However, before considering professional assistance, there's one more step you can try:

Perform a "Factory Reset" on your printer. This step can sometimes resolve software-related issues that might be contributing to the error code. Here's how you can do it:

  1. Turn off the printer and unplug it from the power source.
  2. Wait for about 5 minutes to ensure all residual power is drained from the printer.
  3. Plug the printer back in and turn it on while holding down the "Stop" button (the button with the triangle inside a circle) until the Alarm lamp flashes.

Once you've performed the factory reset, monitor the printer to see if the error code persists. If the issue continues, it's best to contact Canon support or a professional technician for further assistance, as it's likely a hardware issue that may require repair or replacement.

I hope this solution helps resolve the error code C000 on your printer, and you're able to get back to printing smoothly! If you have any further questions or need additional assistance, feel free to ask.

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The poster of this answer has not noted to us that this is an AI generated response, so take it with a grain of salt. It may or may not have relevant and correct information and has not been vetted by a human.

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Josh D will be eternally grateful.
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