Casefans run crazy with H100i

Toggle sidebar Toggle sidebar
N

niels55

Honorable
Jan 15, 2013
41
0
10,530
Hi everyone,

My problem remains unsolved with my newbuilt pc with the H100i and the fans....
So i have an 140MM fan in the front and an 120MM fan in the back of the case

Those two fans keep going on and off, It runs for about 4 seconds at 1100 RPM and then they stop spinning for a few seconds

Does anyone have an solution to this issue?

Thanks in advance
 
Sort by date Sort by votes
P

Paperdoc

Polypheme
Ambassador
Oct 19, 2006
11,306
1,048
69,340
I'm not completely clear what symptoms are bothering you.

You have a liquid cooling CPU system, the Corsair H100i. But I appears your concern is with the case cooling fans. Those case fans are NOT linked to the Corsair H100i in any way.

If you have connected the H100i unit to the PSU_FAN port of your mobo, the mobo can automatically control the CPU cooling system. In a parallel manner, if you have connected your case fans to one or more SYS_FAN ports of the mobo, they also can be controlled automatically by the mobo. BUT those two control systems are entirely independent. The CPU cooling system's control is based on a temperature sensor built into the CPU chip itself. The SYS_FAN ports control case fans based on a different temp sensor built into the mobo, so the CPU temperature has nothing to do with the case fan speeds.

I am no clear about what those case fans are doing, so help me. First of all, are those two fans connected to mobo ports or some other power source? If they are connected to the mobo, are they sharing one mobo SYS_FAN port, or are they on separate ports? If they are sharing, how did you connect the fans together?

Does this process of 4 seconds' running, followed by a shut-down, happen only once when you first start up the machine? Or, does the pattern keep on repeating all the time?

If the pattern happens only once when the machine is first started, and later the fans come on again and stay on, that is the normal process.

If the pattern keeps on repeating all the time, two thoughts come to mind. One is that, if you have BOTH case fans connected to ONE mobo port, they MAY be overloading the port with heavy motor staring current. In that case you would need to move one fan's power connection to a different mobo port. The other possibility is that the automatic fan control system for the SYS_FAN port(s) is not adjusted correctly. In that case it is possible for the control system to just jump back and forth between full cooling and no cooling. If you think that is the problem, look in your mobo manual for how to adjust the SYS_FAN controls. It might be via settings in BIOS Setup. Or, it might be done via a small application utility on your mobo's CD that can be installed and run in Windows. In either case, you MAY have the ability to set some control parameters. Often they are of the following form. You get to set up to 4 things: the Low Temp at which the fan speed is run slowest; the slowest fan speed allowed (at that Low Temp); the High Temp at which the fan speed will be maxed out; and, the speed the fans runs at High Temp. If the gap between Low and High temp is too narrow, that could cause the system to keep on turning the fans on and off. A normal range of case temps might be from 20C (72F) to 50 C (120F).
 
Upvote 0 Downvote
N

niels55

Honorable
Jan 15, 2013
41
0
10,530


Hey thanks for your reply, All the fans in my case are currently connected to the H100i pump

Also the start & stop problem is when im in windows, when i turn on the PC all the fans blast at full speed until i reached windows
So should i try connecting the fans to the mobo itself? or keep it plugged into the pump
 
Upvote 0 Downvote
P

Paperdoc

Polypheme
Ambassador
Oct 19, 2006
11,306
1,048
69,340
OK, this makes more sense. With all fans connected to the H100i unit, they ALL are being controlled by the same controller system and temperature sensor, and here is what happens when you first turn on. All fans receive a a signal to run at full speed at start up. This is for two reasons: any fan motor should have nearly full supply voltage just to start it up, but after a few seconds of running it can have a reduced supply to keep running at a lower speed. And more practically, when the system first starts up, the temp sensor and controller system has not yet initiated. Once the mobo has been running for a few seconds and it can get a temp reading from the sensor and process it, it will reduce the CPU_FAN control voltage because the measured CPU temp is low - after all, the unit just started up! After it is running fully, the CPU will start to warm up and the fans will start to speed up to keep the CPU temp under control. But in your case, it's not just the CPU fans - it is ALL of them, because that is how you set your system.

As I said earlier, the idea is that case cooling should be done separately, under control of a different temp sensor in the mobo. That is accomplished only when the case fans are connected to mobo SYS_FAN ports. For that, usually there is no complication, but I'll point out a couple things to watch for.

1. You have two case fans. How many SYS_FAN ports are on your mobo? If you have enough, connect only one fan per port. If not, you can get small adapters to allow connecting 2 fans to one port.

2. On the connectors from the two case fans, how many holes are in the connector end? There are 3-pin and 4-pin fan designs. Similarly, how many pins are on each mobo SYS_FAN port? Ideally, these should match - that is, plug a 3-pin fan into a 3-pin port, and 4-pin to 4-pin. The 4-pin fan design came later and there is backward compatibility designed in, but not perfect. If you connect a 4-pin fan to a 3-pin port, it will work just fine. (Note that the mechanical design of the connectors means that they fit together only one way so you can't do it wrong, and that you CAN plug a 4-pin fan into a 3-pin port.) On the other hand, if you connect a 3-pin fan to a 4-pin port (yes, you can), normally the fan will only run at full speed all the time, and it will NOT be "automatically controlled". I say "normally" because some mobos allow you to manually set a SYS_FAN 4-pin port to perform as a standard 3-pin port if that is the fan you connected, and some even figure this out all by themselves. But not all mobos have these features.

Try connecting your 2 case fans this way. Usually the BIOS default settings will be just fine and you'll get automatic case ventilation fan control without any need to adjust the settings for them.
 
Upvote 0 Downvote
saxamo

saxamo

Honorable
Aug 14, 2012
30
0
10,530
Hello there,

Hey Paperdoc... If I may ask you a question. I have the h100i as well in my system. I am running it as stated in the manual and there is no operating system on it yet. I only have 2 fans connected to the rad. They are the NB-Multifame S-Series - m12-s3hs. I have the connector from the h100i connecting to both fans. I have the power cable connected to the power supply, I have the fan connector connect to my CPU1 fan connector on the mobo and I have the usb cable running to the usb port on the mobo as well.

When I turn on the machine, the fans both run at full. No problem there, understand what is happening.. When I go into the bios or let the machine sit at the prompt that there is no bootable device in the system the fans run one at a time. When one shuts off the other begins, vice versa. I have watched the CPU i5-4690 start at like 34.5c and rise to 35c over a period of like 10 minutes. Again, machine is not loaded yet. I am just sitting in the bios. Is this an attribute of the h100i saying.. well, I am cool enough, let me just turn the fans on independently as needed and when the OS is finally installed and I am doing something might both fans be running to keep the system cool?

Please advise.. thanks .. Just curious if you have seen this before.

Kind regards,
Saxamo
 
Upvote 0 Downvote
P

Paperdoc

Polypheme
Ambassador
Oct 19, 2006
11,306
1,048
69,340
I can't really comment - I've never used the Corsair H100i cooling system. But you are right, the conditions you see so far are minimal load, so one expects the cooling fans on the radiator to run at some minimal cooling rate. You will see more when you complete your system and can let it do some actual work.
 
Upvote 0 Downvote
saxamo

saxamo

Honorable
Aug 14, 2012
30
0
10,530
Thanks for the reply.. you have basically put my mind at ease temporarily. I was concerned that while I am in the process of loading the OS (takes some time) I don't want to damage the CPU or Motherboard since I can't properly watch the temperature changes. I'll assume that the machine would shut itself off before it did any real damage, but just a thought in my head.. thanks again for the insight. I appreciate your help and your time.

Kind regards,
Saxamo
 
Upvote 0 Downvote
P

Paperdoc

Polypheme
Ambassador
Oct 19, 2006
11,306
1,048
69,340
Your cooling system appears to be working properly - it runs at very low speed under low-load conditions, and the CPU temps are normal. If it was deficient, your CPU temps would be running higher with a light load. so don't worry about installing your OS - it should work just fine.
 
Upvote 0 Downvote
You must log in or register to reply here.

TRENDING THREADS

Latest posts

Moderators online

Share this page

COMPANY
RESOURCES
FOLLOW
Top Bottom