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critical HP
Error Code Amber flashes in the middle of Edge lighting (setup mode)
There is a critical printer error or system failure detected when the device is in Wi-Fi setup mode, indicating problems during attempted connections.
? What Causes This
Issues within initial setup process where configuration fails (e.g., software conflicts; improper power supply voltages).
✓ How to Fix It
Check connectivity with all routers and access points to ensure a stable connection for the printer. Restart the printing device and attempt reconfiguration sequence again.
Source: page 14 of the official manual
From the manual
This error code appears in:
HP Envy 6400E All-in-One Series Printer