!!
critical HP
Error Code Solid amber light fast blinks
A serious error has occurred. Turn the printer off, and then on.
? What Causes This
Critical hardware or firmware error.
✓ How to Fix It
- Turn the printer off by pressing the Power button.
- Wait a few seconds.
- Turn the printer back on.
Source: page 6 of the official manual
From the manual
This error code appears in:
HP Smart Tank 7600 Printer