0x99WorkForce Enterprise WF-C20590

Epson WorkForce Enterprise WF-C20590 error 0x99: Fix

The Epson WorkForce Enterprise WF-C20590 error 0x99 signals that the maintenance box or unit is full or has a connection fault. In this high-production model, this component collects excess ink from cleaning cycles. Below, we indicate how to perform the replacement safely.

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Common causes

  • 1Maintenance unit full after intensive cleaning cycles.
  • 2Defective or unreadable maintenance cartridge chip.
  • 3Loose physical connection between the unit and unit sensors.
  • 4Residual ink detection board failure.

Solutions

Quick Diagnosis

The error 0x99 is triggered automatically when the internal counter for residual ink reaches its critical limit or when the unit's sensor fails to detect the container. If the printer stops, replacement is mandatory.

Step-by-Step Solution

  1. Locate the maintenance compartment on the side of the unit.
  2. Press the release tab and slide the unit out.
  3. Dispose of the full container according to local electronic/ink waste regulations.
  4. Insert the new unit until a firm click confirms the sensor chip connection.
  5. Close the cover and wait for the display to clear the error code.

Prevention and Maintenance

Always have a spare maintenance unit in your inventory. Operating the printer in high-temperature environments can slightly accelerate unit filling.

When to Call a Technician

If the 0x99 error persists after inserting a new, genuine unit, there may be an issue with the internal board connector reading the maintenance box chip.

Equipment Specs

  • Technology: PrecisionCore Line Head
  • Speed/Performance: 100 ppm
  • Connectivity: Ethernet 10/100/1000, USB 3.0
  • Feeding Capacity: 5350 sheets max
  • Compatible Consumables: Epson C9345 maintenance box series
  • Recommended Use: Continuous commercial printing
  • Official Drivers / Firmware

Steps to follow

  1. 1

    Inspection

    Open the side panel to locate the maintenance box.

  2. 2

    Extraction

    Carefully remove the maintenance cartridge to avoid ink spills.

  3. 3

    Replacement

    Install a new, original maintenance unit.

  4. 4

    Reboot

    Close the panels and allow the printer to recognize the new part.

Frequently asked questions

This error occurs because the maintenance ink box has reached its maximum capacity or the chip is damaged.

No, it is a sealed component that should not be manipulated or washed due to safety and spill risks.

In addition to T858 inks, always keep a spare C9345 maintenance box.

It is a user-friendly procedure, simple and designed to be performed without technical tools.

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