What does error code E4 mean on the control panel display?
Error code E4 indicates there is a paper jam. Clear the jam, and then press the Resume button to continue printing. For more information, see the Jams and paper-feed issues section. The manual also warns: do not open the printhead latch when this error occurs. (Page 12)
From the official HP Smart Tank 510 Wireless All-in-One manual, page 12
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