Epson Printer Warning W-41 — What It Means & How to Fix It

What Does This Error Mean?

Warning W-41 on an Epson printer means the maintenance box is completely full. The printer has stopped printing to prevent waste ink from overflowing inside the machine. You must replace the maintenance box before the printer will work again.

Affected Models

Epson WorkForce Pro WF-4740
Epson WorkForce Pro WF-5790
Epson WorkForce Enterprise WF-C5790
Epson EcoTank ET-4760
Epson SureColor P400

Common Causes

The maintenance box has reached the end of its absorption capacity
The W-40 low warning was dismissed and the printer continued printing until the box was completely full
Heavy use or frequent cleaning cycles filled the box faster than expected
The maintenance box was never checked or replaced during the printer's service life
A leaking cartridge deposited extra ink into the maintenance box, filling it prematurely

How to Fix It

Find the correct maintenance box part number for your Epson printer. Check the old box's label or the printer manual.

Common part numbers are T6711, C9345, and T04D1. Do not guess — using the wrong part may cause fit or compatibility issues.
Purchase a genuine Epson maintenance box from a retailer or online. Have it ready before proceeding to the next steps.

Generic third-party maintenance boxes are available and often work correctly, but genuine Epson boxes are most reliable.
Turn off the printer. Locate the maintenance box compartment — it is usually a small door on the rear or right side of the printer.

The location varies by model. Check your printer manual if you cannot find it.
Open the maintenance box compartment and slide the old box out. Place it immediately in a sealed plastic bag.

The old box contains waste ink. Keep it upright and do not squeeze or shake it — waste ink stains permanently.
Insert the new maintenance box and close the compartment door. Power the printer on. The W-41 error should clear and the printer should resume normal operation.

The printer reads the new box's chip automatically. No manual counter reset is needed with a genuine Epson replacement box.

When to Call a Professional

W-41 is a routine user-serviceable maintenance task. You do not need a technician — you just need to purchase and install the correct replacement maintenance box. Once replaced, the printer will resume normal operation immediately.

Frequently Asked Questions

Why does the printer stop completely when the maintenance box is full?

The printer stops printing to protect itself. If it kept printing with a full maintenance box, waste ink would overflow inside the printer and flood the main circuit board. This would cause permanent, expensive damage — far worse than a temporary printing pause.

Can I clear W-41 without replacing the box?

Not reliably. Some third-party software tools can reset the waste ink counter, but without a new box the ink has nowhere to go. If you reset the counter without replacing the box and keep printing, ink will overflow and damage the printer internally. The correct solution is always to replace the physical maintenance box.

How do I dispose of the old maintenance box?

Place the old box in a sealed plastic bag to contain the absorbed waste ink. Dispose of it according to your local regulations for ink waste. Many office supply stores and printer retailers have ink recycling programs that accept old maintenance boxes.