| HP LJ 2100 | |
Primary status codes  "light off"  "light on"  "light blink" | |
 | Start-up.
The Go, Ready, and Attention lights cycle one after another. |
 | Ready. The Ready light is on and the printer is ready to print. |
 | Processing.
The printer is receiving or processing data. |
 | Attention. The printer requires attention for one of the following reasons:
- a door is open - the toner cartridge is missing - print media is jammed in the printer - media supply is depleted |
| Continuable attention error codes | |
 | Continuable error or tray 1 is out of paper. Pressing GO causes the printer to attempt to recover from the error and print whatever it can. If the recovery is unsuccessful, the printer will return to the continuable error state.
Press GO and JOB CANCEL simultaneously to view the secondary continuable error information. |
| General continuable error |
 | Memory overflow/memory full (20) |
| Temporary engine error (41.x) |
 | Print overrun (21) |
 | Buffer flow error (22) |
 | Bad connection (40) |
| NVRAM error (68) |
| I/O error (81) |
 | Memory configuration error |
 | Personality or job-related error |
| EIO port error |
 | DIMM slot 1 incompatible error |
| DIMM slot 2 incompatible error |
| Fatal Error | |
| The printer has experienced an error and cannot recover. All the lights are on.
Note Pressing GO and JOB CANCEL shows the fatal secondary error codes. |
| General fatal error (79) |
| Engine communication error (55) |
| Scanner error (52) |
| Bad beam detect error (51) |
 | Scan motor error (57) |
| Bad fuser error (50) |
| Formatter internal RAM or ROM error |
 | Fan motor error (58) |
| NVRAM error (68) |
 | Scan buffer error (64) |
 | RAM controller error (65) |
| Miscellaneous interface hardware error (67) |
| Accessory error codes | |
| An error has occurred with either the EIO port or the DIMM (memory) slots. |
| Accessory errors secondary codes | |
| EIO port error |
| DIMM slot 1 incompatible error |
| DIMM slot 2 incompatible error |