Non-functional fan on case

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ggonzaga07

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Jul 28, 2014
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I have three fans (not including the CPU fan): two intake ones on the front of my Obsidian 750D and one on the back. I got them hooked up to the motherboard, an ASUS Z97-K, on the CHA_FAN1 (front fans) and the CHA_FAN2 (back fan). However, when I power the PC up, only two of the three fans spin. One in the front spins and the back one as well. The second fan doesn't spin at all. What is wrong? Or, is it just some power management system preference that only turns on the second fan in needy situations?

Please let me hear your ideas.
The computer works 100% fine, but I want to change these stock fans to LED equipped fans to make the inside look cool. If the fan doesn't work then I should not bother buying a new third one.
 
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volcanoscout

volcanoscout

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Jan 5, 2014
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Try disconnecting the fan that spins and see if the non-spinning fan works when plugged into the header by itself. If it doesn't work, you've probably got a dead fan. If it does work, you may have a bad fan splitter, or the header may not be pushing sufficient power. The headers should each handle @ 1A/12W, and if those are the stock fans, I doubt they draw enough to overload the header if it's working properly.
 
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ggonzaga07

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Jul 28, 2014
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How am I supposed to unplug the working fan and plug the non-working fan on? It is one cable for the two frontal fans, plugged into CHA_FAN2. Then CHA_FAN1 is being used by the one exhaust back fan. Should I try to put the frontal fans on CHA_FAN1 and the back fan on the CHA_FAN2? Would that make any difference?
 
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volcanoscout

volcanoscout

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That's wild - I've never actually seen two fans permanently wired together. Or heard of them either. I assumed you were using a y-cable.

Anyway, yes switch the headers that the fans are plugged into and see if they work right. If you still get one fan spinning and one not, try plugging it directly to your PSU if you have a 4pin Molex adapter.
 
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ggonzaga07

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Jul 28, 2014
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I'm not sure if there is only one cable coming out, what I'm trying to say is that only one cable is plugged, and I honestly don't see any other cables hanging loose. There is a hard drive cage behind the lower (non-functional) fan, so I can't see much more. Even if there was a cable, where would I plug it? Pretty sure there is no CHA_FAN 3... or would I use a Y-Cable like you said? I think Corsair used a Y cable already for those fans..
Would there be a Molex in the PSU box? My PSU is modular so I have the cables in a box
 
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volcanoscout

volcanoscout

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Jan 5, 2014
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At a guess, you only have one of the front fans connected. They wouldn't have hooked up the stock fans on a splitter. The fans mount from the front - if you pull the front panel and filter off, you should be able to trace the fan lead from the fan to the 3pin connector. To make them both work off of one header, you'll need to pick up a 3pin fan splitter cable at your local computer store or buy it online. Once you have that, plug one fan lead into each 3pin male connector on the splitter, then plug the female end into your chassis fan header.
 
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