Once which fan is known as reported faulty, check the fan number positioning on the lid (or consult your server user guide) and see if the fan is running or not. Caution: Be careful when opening the lid of the server without turning it off to check the fans. The intrusion switch might be triggered or not working. In this scenario at least one fan or fan assembly (contains two fans) is either damaged (connector, fan blade, fan blade. Heat is the silent killer in the world of IT. All the parts in your server rack, the CPU processing billions of cycles per second, the hard drives spinning at more than 7,200 RPM, all are producing thermal energy. The holes are pre-drilled, and the fan unit comes with screws. Ensuring the fan blades are clean and unobstructed can typically resolve this.