CPU Fan Error (POST)

What is CPU-FAN-ERROR?

The motherboard BIOS cannot detect a CPU fan signal during POST. System may refuse to boot to protect the CPU.

Common Causes

• Fan not connected to CPU_FAN header
• Fan speed too low for BIOS threshold
• Faulty fan motor

Step-by-Step Fix Guide

• 1
  Check connection to CPU_FAN header
• 2
  Lower 'CPU Fan Speed Lower Limit' in BIOS
• 3
  Replace CPU cooler

Commands & Diagnostics