Epson ET-4850 “Replace the maintenance box”
A message on the LCD screen asks you to replace the maintenance box, which stores surplus ink from printing and print head cleaning. When it is full, printing and print head cleaning stop; scanning still works.
Cause 1 of 2The maintenance box needs replacing. Source: Maintenance Box Replacement, pp. 221-222
First checkReplace the maintenance box with a new one, part number T04D100.
Causes and checks
The maintenance box needs replacing. Source: Maintenance Box Replacement, pp. 221-222
- Replace the maintenance box with a new one, part number T04D100. See Replace the maintenance box.
- Do not reuse a maintenance box that has been removed and left uninstalled for a long period.
Power Cleaning is refused because the maintenance box has too little free space or the ink is low. Source: Power Cleaning, p. 235
- Check the maintenance box status on the LCD screen. See Check the maintenance box status.
- Replace the maintenance box if it is full. See Replace the maintenance box.
All 2 causes checked. Contact Epson America technical support: (562) 276-4382.
Service
If the checks above do not clear it, contact Epson America technical support: (562) 276-4382, epson.com/support. United States, 6 AM to 8 PM Pacific Time, Monday through Friday, and 7 AM to 4 PM Pacific Time, Saturday. Canada: (905) 709-3839, same hours (epson.ca/support). Source: Where to Get Help, p. 310
Other ET-4850 codes
- Printer error. Turn on the printer again.: A general printer error is shown on the LCD screen.
- Paper out in XX.: The named paper cassette is empty.
- Paper Setup Auto Display is set to Off: AirPrint needs the Paper Setup Auto Display setting turned on.
- No dial tone is detected.: The product cannot detect a dial tone for fax.
- Borderless ink pad nearing end of service life: The borderless printing ink pad is close to the end of its service life. The message stays until the pad is replaced.
- Borderless ink pad at end of service life: The borderless printing ink pad is full. Operations that use no ink, such as scanning, still work.
- Update the root certificate: The root certificate for cloud services is out of date.
- IP address and subnet mask combination is invalid: There is a problem with the network connection to the product.
- Check that the printer driver is installed on the computer and that the port settings are correct: The computer cannot send the job to the product.
- Recovery mode: An error occurred during a firmware update.
- Maintenance box status icon: The icon displays the maintenance box status.
- Network status icons: Show whether the product is on Ethernet, Wi-Fi or Wi-Fi Direct. Selecting the icon opens the network setup.
- Setting problem icon: There is a problem with the indicated setting.
- Quiet Mode icon: Quiet Mode is on or off. When on, noise is reduced during printing for some paper types and print qualities, and print speed may also be reduced.
- Power light flashing: The product is cleaning the print head or charging it after the first ink fill. The light stays on when the cleaning cycle finishes.
- Received fax light flashing: Received faxes have been temporarily saved to the product's memory.
- E-1 (network report): The report says to confirm that the network cable is connected and network devices are on.
- E-2, E-3 or E-7 (network report): No wireless network name (SSID) was found, or the entered key does not match the router or access point.
- E-5 (network report): The security mode on the router does not match the printer's setting.
- E-6 (network report): The MAC address of the printer may be filtered.
- E-8 (network report): An incorrect IP address is assigned to the printer.
- E-9 (network report): The connection and network setup of the computer or other device needs confirming. Connection using EpsonNet Setup is available.
- E-10 (network report): The IP address, subnet mask and default gateway setup needs confirming.
- E-11 (network report): The TCP/IP setup is incomplete. Confirm the default gateway setup.
- E-12 (network report): The security key, key index, IP address, subnet mask or default gateway setup needs confirming.
- E-13 (network report): The security key, key index, or the connection and network setup of the computer or device needs confirming.
- Wi-Fi environment needs to be improved: The Wi-Fi signal or environment is poor.
- No more devices can be connected: The Wi-Fi Direct (Simple AP) limit of 8 devices is reached.
- Same SSID as Wi-Fi Direct exists: A nearby network has the same name as the product's Wi-Fi Direct network.
Sources
- User's Guide, ET-4850. Epson America, Inc. Document CPD-60205, revision CPD-60205R1, 333 pages, en-US. files.support.epson.com (PDF). Listed on the manufacturer's support page. Retrieved 13 November 2026.
Page numbers are the numbers printed in the manual. Where this page and the manual differ, follow the manual.