Rear chassis fan Z400 always runs at high SPEED

I have several Z400 workstations. One of them is much noisier than the rest: the rear system (case fan) fan is almost always running at high RPM. On the normal Z400s, the BIOS Setup. File | Speed of about 1 600 rpm of fan reports of temperatures of the system chassis. On the noisy Z400, the chassis fan speed is reported as 3752 RPM. The two Z400s run the latest version of the BIOS public, 3.57. Both have a BIOS Setup | Power | Thermal | Fan Idle Mode set to 1. Fan Idle Mode 1 to 5 on the normal Z400 cycling makes a huge difference in fan RPM. Bike 1-5 on the noisy system has hardly made a difference.

How can I calm the chassis fan in the noisy Z400? I carefully cleaned to vacuum inside the Z400, including the withdrawal of the air cover that protects the DIMMs. If it's important, the Z400s running Windows 7 Pro with all the latest patches.

I noticed that the BIOS Setup. File | Temperatures of the system reported a temperature of 23 C on the 0C on the noisy Z400 Z400 normal. Are there opportunities that "0C Température" means that the room temperature sensor is broken, and without knowing what the temperature, the BIOS runs the fan at full speed no matter what? If so, how would I debug/fix this?

Thank you.

Scott, you are quite right.

I replaced the on/off switch and LED cable assembly, including the thermal sensor, on the noisy Z400 with a plug to a normal Z400. The noisy Z400 is now normal, with a rear chassis at about 1700 RPM fan. The BIOS reports the temperature of ambient air properly to 23 C.  'How to' instructions from HP for the replacement of the cable were good enough. Now all I have to do is to order another set of good cable.

Scott, thank you very much, for the rapid diagnosis and useful links. This issue is RESOLVED. Thanks again.

Tags: HP Desktops

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