What should I do when there is an ink system maintenance error?
When encountering an ink system maintenance error, open the printhead access door completely and then close it immediately. This helps remove ink buildup and maintains good print quality throughout the printer's life. Ensure not to open the blue printhead latch during this process as it may necessitate new printheads. (Page 21)
From the official HP Deskjet GT 5820 All-in-One Printer manual, page 21
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