What should I do if my printer is getting low ink or out of ink?
When the CMYK icons are on and one or more Ink icons are blinking but there’s no warning light, refill the indicated tank with low ink. If the Ink/Printhead light ( ) is also on, immediately refill as it's very low (Page 4).
From the official HP Smart Tank Plus 550 Wireless All IN One manual, page 4
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