GigJINGLES Posted February 18 Share Posted February 18 I'm having an issue controlling fans 3 and 4 on my Commander. When I connect my 6 fans, x2 (ML120) which came with the AIO and x4 SP120 RBG Elite's, fans 3 & 4 always run a full speed. I have tried changing fan curves, different fans in those ports, only run the fans that came with the AIO in those ports. I've uninstalled iCUE, restarted letting my PC sit without power before starting again. Updating firmware. Changing fan curves. The fans were controllable when I had x2 AIO (ML120) and x2 SP120. Now I can't even get those to work in port 3 & 4 on the commander. Really appreciate any help. Link to comment Share on other sites More sharing options...
c-attack Posted February 18 Share Posted February 18 Do a full shutdown and then flip off the PSU. Then disconnect fans 3/4 from the Commander Core (PWM side only) and then reconnect. Disconnect and reconnect will help sometimes when a pin isn’t making good contact. The PSU off during this will force the Commander Core to do a full check on the next boot. That controller uses an auto detect feature at power on and occasionally may not properly identify what’s there. Link to comment Share on other sites More sharing options...
GigJINGLES Posted February 18 Author Share Posted February 18 Thanks for the response. I gave that a go, unfortunately 3 & 4 are still running at full speed also gave the connectors a little clean. Tried to reset the commander with the reset button but still nothing. Just can't seem to get it to control fans in those ports. Link to comment Share on other sites More sharing options...
c-attack Posted February 19 Share Posted February 19 Don't spend too much time on the reset button. It usually does not work for this type of issue and can make a mess of your profiles. The next step would be to swap either fans 5/6 or 1/2 with the stuck 3/4 -- again PWM side only. If the new fans moved to 3/4 now become stuck at max as well while the old 3/4 run just fine on another port, then the Commander Core is likely at fault. If the same fans are still stuck at max at their new location, then it would seem the fans are fault. Very odd to have two get stuck at once. Based on the RPM, I am pretty sure you do have all SP-Elite fans but when you swap the fan again make sure they are all 4 pin connectors and there are no 3 pin models mixed in. Whether by accident or the old "Amazon return switch", sometimes users get the prior DC motor SP-Pro mixed in. Any DC fan will be stuck at maximum on a PWM only controller like the Commander Core. Link to comment Share on other sites More sharing options...
GigJINGLES Posted February 19 Author Share Posted February 19 Thanks. I tried moving the fans around and it doesn’t matter if it’s the SP120’s or the fans that came with the AIO, speed is always full. Also checked and all the fans are 4 pin. Another odd thing I noticed is that when gaming or running a stress test fan 4 sometimes drops RPM. Down to around 800/900RPM. As I mentioned before, these ports worked before I got some extra SP120’s. At this point I’m just going to try and get a Commander replacement from Corsair I guess. Thank you for your suggestions. Link to comment Share on other sites More sharing options...
c-attack Posted February 19 Share Posted February 19 (edited) Start a Support Ticket with Corsair from the link at the bottom of the page. Chances are you are going to need a replacement. No reason to delay in case that is needed. Repeat what you said initially about CUE clean install and firmware update and then the last part about all fans moved to 3/4 do this. All logic points at the controller, however.. Another user surprised me this week. They had a Com Core doing something similar with the pump maxing out. They had seen another post about PSU wiring and were wondering if this was related. This seemed very unlikely since a lack of power or fight for power among devices should cause fans/pumps/lighting to dip, not max out. Nevertheless, re-arranging some PSU cables appears to have resolved it. I can’t explain why it worked, but it may be prudent to talk about your PSU. Any recent changes, new gpu using a 12vhpwr adapter, 3-4 HDDs on the same SATA line as the Commander Core, total PSU power? The stress test dip and that this worked with 4 fans before makes me wonder if the Com Core simply does weird things when strained on power. Edited February 19 by c-attack Link to comment Share on other sites More sharing options...
GigJINGLES Posted February 19 Author Share Posted February 19 Thank, opened a support ticket yesterday so will see what comes from that. I have a Corsair TX650M PSU. No recent hardware changes although I did recently change my case to a 4000D, when I connected everything back up this is where I've had issues. I had a similar issue before and I had to connect the fans up 1 by 1 to get control, but that isn't working this time. I have connected the Commander to it's own SATA power cable now, unfortunately no change to fan speeds. Very strange that under load Fan 4 ramps down. Attached is a Cinebench run where you can see the fan slowing down, then it goes back up again after the run. Link to comment Share on other sites More sharing options...
GigJINGLES Posted February 19 Author Share Posted February 19 Another strange this is if I change Fan 3 to Zero RPM, Fan 4 ramps up. Change Fan 3 back to Balanced, Fan 4 ramps down. Link to comment Share on other sites More sharing options...
c-attack Posted February 19 Share Posted February 19 That 3-4 interaction makes me thing there is a problem with the Com Core circuit board. So if you temporarily disconnect fans 5/6 from PWM, do 3-4 work normally? The PSU issue was strange and a change to gpu pci-e cables resulted in correction of the Com Core issue. No physical connection between the pci-e and SATA cables except the PSU itself. Link to comment Share on other sites More sharing options...
GigJINGLES Posted February 19 Author Share Posted February 19 When I disconnect all but fan's 3&4 I still don't have control unfortunately. As you say, seems to be a Commander issue. Hopefully I can just get a replacement. Will keep you updated. Thanks again for all the suggestions. Link to comment Share on other sites More sharing options...
Solution GigJINGLES Posted March 4 Author Solution Share Posted March 4 Received a new commander core from Corsair. Their customer service was very helpful. And all fans are working well now. Full control of speeds. 👍 Link to comment Share on other sites More sharing options...
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