I had the very same thing happen to me on my R3000. You need to do an ink charge using the WIC reset utility. It does ink charges for free, but you'd have to pay if you need to reset the waste pads.
The battery style chips sometimes reset by themselves, especially when removing carts to shake them. I remove carts periodically to inspect ink levels and shake them. If they reset to full, I fill it right away. l usually do this allowing enough time to refill if necessary.
The batteryless don't reset like this, but they can't be reset manually.
Hope this helps.