What does the 'E4' error code typically indicate in the HP Smart Tank 515 AIO printer?

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Grade: Education Subject: Support
What does the 'E4' error code typically indicate in the HP Smart Tank 515 AIO printer?
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The 'E4' error code in an HP Smart Tank 515 AIO printer generally indicates a problem with the ink cartridge or the ink supply system. It often signifies a blocked ink nozzle, an issue with the cartridge's connection, or a problem with the ink pump. It's a common error that requires troubleshooting.