Question How to tell if your CPU/Case fans have failed ?

[knowledge2121]

So air coolers come with two fans and a splitter, you connect the fans to the splitter and the splitter to the PWM CPU fan header ....

If only one of the fans fail, How can you figure this out by just looking at HWiNFO ?

If both fans fail, How can you figure this out by just looking at HWiNFO ?

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How about case fans that are daisy chained or connected to a splitter and then connected to a single voltage controlled case fan header ?

If only one of the fans fail, How can you figure this out by just looking at HWiNFO ?

If some fans fail, How can you figure this out by just looking at HWiNFO ?

If all fans fail, How can you figure this out by just looking at HWiNFO ?

 

[Ralston18]

Update your post to include full system hardware specs and OS information.

Regarding HWiNFO Fan speeds/status - start here:

https://www.hwinfo.com/forum/threads/hwinfo64-v7-12-how-to-monitor-fan-speeds.7665/

https://www.hwinfo.com/forum/thread...n-speeds-on-asus-vivobook-x513ia_m513ia.9229/

 

[CountMike]

So air coolers come with two fans and a splitter, you connect the fans to the splitter and the splitter to the PWM CPU fan header ....

If only one of the fans fail, How can you figure this out by just looking at HWiNFO ?

If both fans fail, How can you figure this out by just looking at HWiNFO ?

---------------------------------------------------------------------------------------------

How about case fans that are daisy chained or connected to a splitter and then connected to a single voltage controlled case fan header ?

If only one of the fans fail, How can you figure this out by just looking at HWiNFO ?

If some fans fail, How can you figure this out by just looking at HWiNFO ?

If all fans fail, How can you figure this out by just looking at HWiNFO ?

If fans are connected by such splitter or simple hub they are connected in parallel so SW will see it as one at speed somewhere in between not as separate ones and will be controlled as one. In addition, proper PWM splitter will have one (RPM sensor) wire missing in one branch.

 

[Paperdoc]

The simple answer to your question is: look. With the system running, LOOK at the fans - all of them. Any that are connected together or are configured to run the same way should appear to be doing the same thing. Any that are STOPPED should not be, and may have failed completely. Any that should perform the same but seem t o be slower or show highly variable speeds should be considered a problem under development.

Every fan generates its own speed signal, consisting of a series of 5 VDC pulses (two per revolution) sent back to the host fan header on Pin #3 of the connector. The header counts them to get the speed reading. The root of this issue is that any mobo fan header can deal with the pulses received from only ONE fan. So when you use a Splitter or a Hub to connect many fans to one header, that unit will send to the host header the speed signal from only ONE fan, and ignore all the others. Those "others" speeds will never be seen anywhere. Now, an important second function of any header is to monitor that speed signal for NO signal indicating fan FAILURE. When that happens you get a warning on your screen so you know of the problem. But for any fan whose speed signal is NOT sent back, the header can't do that job. So from time to time YOU need to look and verify that all fans still are working, especially those connected via a Splitter or Hub.