HP 800 G4 SFF Error 900: CPU Fan Not Detected

HP 800 G4 SFF · taken from the manufacturer’s manual, pages cited

Error code900

The system detected that the CPU fan is not connected or has malfunctioned. The manual's first action is: “1. Reseat CPU fan. 2. Reseat fan cable. 3. Replace CPU fan.”

Model
HP 800 G4 SFF
Display shows
CPU Fan Not Detected (900)
Type
Error code
Source
Manual p. 119

What 900 means

CPU Fan Not Detected p. 119

Common causes

  • CPU fan is not connected or may have malfunctioned. p. 119

Safety warnings — read before you start

  • CAUTIONCAUTION. As each subassembly is removed from the computer, it should be placed away from the work area to prevent damage. p. 22
  • CAUTIONCAUTION. Handle cables by the connector whenever possible. In all cases, avoid bending or twisting the cables, and ensure that the cables are routed in such a way that they cannot be caught or snagged by parts being removed or replaced. p. 22
  • CAUTIONCAUTION. When servicing this computer, ensure that cables are placed in their proper location during the reassembly process. Improper cable placement can damage the computer . p. 22

What to do

  1. 1. Reseat CPU fan. 2. Reseat fan cable. 3. Replace CPU fan. p. 119

If 900 is still not resolved

The manual gives no further instruction for this code. Open the code table in the PDF or contact HP service.

Open the manual at page 119 All 800 G4 SFF error codes Manual details & download

This page summarises what the manufacturer’s manual says about 900; each statement links to the page it comes from, and quoted lines are copied word for word. It is not a substitute for the manual or for a qualified installer. ManualLib is not affiliated with HP. Found a mistake? Report an error.