ink replacement on 6400 printer

[Kate742]

After installing new HP cartridges on 6400 printer but only blinking E and O.

[VikramTheGreat]

Hi @Kate742,

Welcome to the HP Support Community.
 

Thank you for posting your query. I will be glad to help you.

I understand your HP ENVY Pro 6400 All-in-One Printer is showing a blinking “E” and “0” after installing new cartridges. It typically indicates an ink cartridge error or cartridge recognition issue.

Steps to Resolve the Issue:

1. Power Cycle the Printer
   • Turn off the printer and unplug it from the wall.
   • Wait 60 seconds.
   • Plug it back in and turn it on.
      
2. Check the Cartridges
   • Open the cartridge access door.
   • Remove both cartridges.
   • Make sure all protective tape is removed.
   • Gently clean the copper contacts with a lint-free cloth.
   • Reinsert the cartridges firmly until they click into place.
      
3. Use Genuine HP Cartridges
   • Ensure you are using original HP cartridges.
   • If using refilled or third-party cartridges, the printer may not recognize them.
      
4. Reset the Printer
   • With the printer on, unplug the power cord from the back.
   • Wait 60 seconds.
   • Plug it back in and turn it on.
      

 For additional help, please use this link: HP DeskJet, ENVY 6000, 6400 - Blinking lights and error codes | HP® Support
 

I hope this helps.

Take care and have a good day.

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VikramTheGreat

HP Support