HP Officejet 7612 Wide Format e-All-in-One - Manual (Page 284)

Door or cover open
Before the printer can print documents, all doors and covers must be closed.
TIP: When completely closed, most doors and covers snap into place.
If the problem persists after you’ve securely closed all doors and covers, contact HP support. For
more information, see HP support on page 97.
ENWW Door or cover open 267