!!
critical HP
Error Code Power LED flashing red twice, once every second for six iterations then stops beeping but LEDs continue flashing
Indicates processor or thermal protection due fan blockage or improper CPU cooling.
? What Causes This
Fans possibly blocked by foreign objects in vents, miswired cables.
✓ How to Fix It
1. Clear any vent obstructions and inspect fan operation.
Source: page 79 of the official manual
From the manual
This error code appears in:
HP Prodesk 400 G3 Desktop Mini PC