HP 2000CP 2500CP - Manual (Page 68)

System Error Codes 2-33 HP DesignJet CP Series Printers
D Each X can be a digit from 0 to 9.
D The 1st digit is the severity and the main cause of the error. Codes (XX)
that are below 50 correspond to ignorable errors (currently they are not
displayed).
1st Digit Cause of Error
9 Missing Ink Systems
8 Mixed Ink Systems
7 Removed Components
6 Electrical Problem
5 Logical Problem (Incorrect Ink System)
3 Alignment Error
2 Printhead Check Error
1 Other errors
D The 2nd digit indicates the component causing the error or the secondary
source of the error. Ignore (when possible) a “0” or “1” in the 2nd X if the
optional YYYY is present (because it is coded with these digits).
1st Digit Component Causing Error
0 Media
1 LED or Lens Cover
2 Ink Cartridge
3 Head Cleaner
4 Printhead
5 Thermal Shutdown
6 Bad Printhead Initialization
7 Continuity Error
8 Ink Delivery System (the whole kit
potentially affected)