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Corsair Commander PRO - 4 Pin Fan Isues


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Hi all,

I've recently been using the Corsair Commander PRO, and I've stumbled across a rather unusual issue...one that I really can't wrap my head around!

My current set up, has 3 Corsair iCUE SP 120 RGB 3-Pin fans connected to the Commander Pro in connections 1, 2 and 3, these work fine! They show up in iCUE, I can adjust the RGB, Performance mode etc, great.

My front 3 fans, are the stock 3 fans that come with the H150i AIO CPU Cooler, and as such are attached to the AIO radiator, these 3 fans are 4-Pin fans, however, this is where my mind starts to get a bit blown....

If, I connect these fans to connectors 4, 5 and 6 of the Commander Pro (as in securely, pushed all the way in, nice and snugly), nothing happens, they won't spin, nothing at all, no show in iCUE either....however...whilst troubleshooting and removing the cables to switch them around and try elsewhere, I noticed that if, I BARELY insert the fan connector into the Commander Pro (so the pins are barely inside the connector), the fans start to spin and work fine! But then posing the connection all the way in to be a secure fit breaks it and it stops working.

 

I've tested the fans in each of the 6 Commander Pro fan connectors and the problem is the same each time, the fans themselves clearly work fine, and work fine from motherboard fan headers, but that defeats the purpose of buying the Commander Pro to control my 6 fans. So my question is, why do tye fans work when the cable is literally hanging by a thread? I obviously can't leave the cables that way, the slightest nudge causes the fragile contact to be lost and the fans stop, but I can't properly connect the fans as that also makes them refuse to work.

The commander is designed to take either 3 or 4 PIN fans so I can't see how that's an issue, but it's the only obvious difference that I can see. Could it be a power issue? But then again that doesn't explain why the loosest, barely connected cable works whereas a firm connection doesn't, I can't wrap my head around it!

It's a bit too weird of a coincidence for either 3 fans to be faulty or 3 separate ports on the Commander Pro right?

For your information, the Commander Pro is connected to a bottom rear USB header, and I have tried switching it's power connector to a different one, no luck there!

 

Hopefully someone can shine some light on this strange issue!

 

Thanks

 

Dale

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Go into the Commander Pro settings and specifically set the 3 SP-RGB headers to “3 pin” and the 3 ML-Elite OEM headers to 4 pin. It’s possible they are not responding to auto fan test on start and it’s generally preferable to set PWM fans to 4 pin so it can skip the 100% power on test. 

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35 minutes ago, c-attack said:

Go into the Commander Pro settings and specifically set the 3 SP-RGB headers to “3 pin” and the 3 ML-Elite OEM headers to 4 pin. It’s possible they are not responding to auto fan test on start and it’s generally preferable to set PWM fans to 4 pin so it can skip the 100% power on test. 

You Sir, are a genius! It was something so simple! I had no idea I had to change anything on the commander settings, I figured as the Commander Pro was designed to take 3 or 4 pin fans that It would detect automatically and adjust from there!

 

Thanks so much, saved my brain from melting trying to work it out.

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It should have worked automatically. However, it’s possible the protocol was having trouble with the mixed set. If you are using PWM fans, it’s generally preferable to set them to 4 pin anyway vs auto. 

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