!!
critical HP
Error Code Service light
Blinks to indicate a serious device malfunction that needs professional attention from service personnel.
? What Causes This
Issues related to severe hardware failure inside the printer, often not resolvable without specialized tools or expertise.
✓ How to Fix It
Contact technical support immediately for further instructions on how to proceed.
Source: page 17 of the official manual
From the manual
This error code appears in:
HP Laserjet Pro 3001 3008dn DW Printer