E-50
Epson Printer
Severity: CriticalWhat Does This Error Mean?
Error E-50 means the maintenance box in your Epson printer is full. The maintenance box collects waste ink from head cleaning cycles and cannot hold any more. You must replace the maintenance box before the printer will work again.
Affected Models
- Epson EcoTank ET-2760
- Epson EcoTank ET-4760
- Epson WorkForce WF-7710
- Epson WorkForce Pro WF-3720
- Epson Expression Premium XP-7100
Common Causes
- The printer has performed many head cleaning cycles over its lifetime, filling the waste ink box
- The printer was used heavily for high-volume printing, generating more waste ink than average
- The maintenance box was not replaced when an earlier warning was displayed, and it is now completely full
- The maintenance box was installed incorrectly and the printer cannot communicate with it
- A generic or refilled maintenance box is not being recognized by the printer's chip reader
How to Fix It
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Order a replacement maintenance box for your specific Epson model. Find your model number on the sticker on the bottom of the printer.
The most common maintenance box for EcoTank and WorkForce models is Epson part T04D100 or C9344. Confirm the right part for your model on Epson's website.
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Once the replacement box arrives, turn the printer off. Locate the maintenance box — it is usually at the back or side of the printer in a small compartment.
Check your printer's manual for the exact location. The slot is usually labeled and has a small tab to release it.
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Slide or pull out the full maintenance box. Hold it upright — do not tip it sideways or the waste ink will spill.
The box is sealed, but tipping it can force ink out of the vent holes. Place it in the bag that came with the new one.
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Insert the new maintenance box into the slot until it clicks into place.
Make sure the maintenance box is fully inserted. A partially inserted box will still trigger the E-50 error.
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Turn the printer back on. The error should clear automatically when it detects the new maintenance box.
If E-50 persists after installing a new box, the box may not be recognized — make sure it is a genuine Epson part or a compatible brand with a valid chip.
When to Call a Professional
Error E-50 requires a maintenance box replacement — this is not a repair, just a consumable swap. Maintenance boxes for most Epson models cost $10 to $25 and are easy to install yourself. Never try to empty and reuse a full maintenance box — this can cause ink leaks inside the printer.
Frequently Asked Questions
How much does an Epson maintenance box cost?
Genuine Epson maintenance boxes typically cost $10 to $25, depending on the model. Third-party compatible boxes are available for $5 to $15. For most people, replacing the maintenance box is far cheaper than a new printer.
Can I empty and reuse the maintenance box instead of buying a new one?
No. Epson maintenance boxes have a chip that tracks how full they are. Even if you empty the box, the chip will still report it as full. You must install a new box with a fresh chip to clear the E-50 error.
How often will I need to replace the maintenance box?
On a typical home printer, the maintenance box lasts 2 to 5 years depending on how often you run cleaning cycles. Frequent head cleaning uses more waste ink and fills the box faster. To extend the box's life, avoid running unnecessary cleaning cycles and use the printer regularly to prevent nozzle clogging.