A full maintenance box can stop printing or cleaning on a model with a user-replaceable box. The exact Epson model and part number matter; some waste-ink systems require service instead.
Confirm the hardware
Read the full printer model and its on-screen warning. Epson's ET-3850 support says a full maintenance box prevents printing or printhead cleaning until replacement. That does not prove another Epson model uses the same box.
Find the right part
Use the maker's compatible-products list for the exact model. Do not confuse a maintenance box with an ink bottle or try a software reset in place of the required part. Check whether the user manual permits owner replacement.
Handle safely
Follow the official removal and disposal instructions; used boxes can contain waste ink. Stop if the part is service-only or the error remains after the documented procedure.
Official references
Useful next steps
Found a mismatch? Request a correction with the public source URL and exact model, without passwords or full serial numbers.