Epson Error W-04: Cartridge cover is open
✅ Usually fixable yourself
On the Stylus NX420W, W-04 means the ink cartridge cover is open.
What to try
- Close the cartridge cover fully.
- Press Start to continue.
When it needs a technician
If the error stays with the cover closed, contact Epson support.
Which models show W-04
Epson documents this code for models including Stylus NX420W.
First steps for any printer error
- Write down the exact code before you do anything else — similar-looking codes often mean completely different things.
- Power the printer off, unplug it for a couple of minutes, then power it back on. A surprising number of transient errors clear here.
- Open the covers and check for paper scraps, packaging material, or anything blocking the carriage.
- Check the cartridges or tanks are genuine, correctly seated, and not empty.
- Confirm the printer is plugged directly into a wall outlet, not a power strip or extension lead.
- Check your model’s own manual — codes are model-specific, and the manual is the authority for your machine.
Source: Epson User's Guide - Stylus NX420W, Check Error Codes. Codes are model-specific, so your own model's manual is the final word. Reviewed October 2026.
Still showing W-04?
Tell our printer technician your model and what you've tried. You'll find out whether it's fixable at home or worth repairing at all.
Ask about my printer — $1Eric Paul Amora · Printer & Hardware Repair Technician
Related Epson codes
W-02 — Paper jammed inside the printerW-03 — Paper jamW-05 — Paper out or multiple sheets fedW-10 — Ink cartridge expended or not installed rightW-12 — Ink cartridge installed incorrectlyW-30 — Memory card problemI-11 — No memory card insertedE-11 — Ink pad at end of service lifeW-11 — Ink pad nearing end of service lifeE-01 — Printer error (general fatal error)E-02 — Scanner errorE-12 — Borderless ink pad needs replacing