What does error code E7 mean and how do I resolve it?
Error code E7 means one or more ink tanks are out of ink. The Attention light, error code E7, and one or more Ink icons will be blinking on the control panel display. To resolve this, refill the indicated ink tank that is out of ink. (Page 8)
From the official HP Smart Tank 6000 Printer manual, page 8
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