!!
critical HP
Error Code LED blinking amber
System failure detected — printer is not in normal operating condition.
? What Causes This
Critical hardware issue or electrical malfunction.
✓ How to Fix It
Shut down power, disconnect and reconnect the system. Perform diagnostics. Contact HP support if unresolved.
Source: page 152 of the official manual
From the manual
This error code appears in:
HP Laserjet 1300 Printer