HP DeskJet GT 5820 - Manual (Page 113)

Control panel error codes
If the Number of copies icon on the printer display is alternating between the letter E and a number, it
indicates the printer is in an error state. The letter E and the number work as error codes. For example, if the
Number of copies icon is alternating between the letter E and the number 4, it indicates that a paper jam has
occurred.
To identify the error code and its corresponding solutions, see the information about the Number of copies
icons in Control panel lights and display icons status on page 8 .
ENWW Control panel error codes 107