Showing results for 
Search instead for 
Did you mean: 
New member
2 0 0 0
Message 1 of 2
Flag Post

the ink delivery tubes of my printer has bubbles inside or not flowing through.

HP Recommended
Microsoft Windows 7 (32-bit)

Help: the ink inside the tube of my printer keeps flowing back after I unlock valve. How can I prevent the ink from flowing back.

HP Support Agent
HP Support Agent
25,686 25,566 1,410 1,482
Message 2 of 2
Flag Post
HP Recommended



Welcome to HP support community.


Check the ink delivery system

  1. Make sure the transportation ink valve is in the unlocked position.


    Printing with a locked transportation ink valve can damage the printheads.

    Unlocking the transportation ink valve

  2. Make sure the printer is turned on.

  3. Inspect the position of the blue printhead latch.

    1. Open the exterior door.

    2. Open the printhead access door.

      Opening the printhead access door

    3. Wait until the carriage is idle and silent before you continue.

    4. Visually inspect the printhead latch position.

Refer step no.4 in this HP document:- Click here


Let me know how it goes.

To thank me for my efforts to help you, please mark my post as an accepted solution so that it benefits several others.


I am an HP Employee

0 Kudos
Warning Be alert for scammers posting fake support phone numbers and/or email addresses on the community. If you think you have received a fake HP Support message, please report it to us by clicking on "Flag Post".
† The opinions expressed above are the personal opinions of the authors, not of HP. By using this site, you accept the Terms of Use and Rules of Participation