⚠
warning HP
Error Code Power button light fast blinking
The printer is in an error state or the ink access door is open.
? What Causes This
Open ink access door or printer error condition.
✓ How to Fix It
If the ink access door is open, close it. If the ink access door is closed and the light is blinking fast, the printer is in an error state. Check your computer or device for messages. Try printing a page to generate an onscreen message.
Source: page 16 of the official manual
From the manual
This error code appears in:
HP Smart Tank 6000 Printer