Question PWM Fan hub only controls the speed of one fan?

[IAXEM]

Hey all. I bought Antec fusion fans which come with a fan/RGB hub included. I have 4 fans plugged into it, and they all light up/power on - but only one of them (the one plugged into the first slot) adjusts its RPM (and displays the speed accordingly) while the rest blow at 100%.

These are 4 pin fans plugged into a 4 pin cha_fan header (which I've checked the manual, DOES support PWM). I've tried the two chasis headers on the board and the same issue persists.

If I move the fan to different slots on the hub, it loses the ability to change its speed and report it back (BIOS shows 'N/A' on that header).

I've made sure all connections are secure and seated, to no avail.

Any guesses?

 

[punkncat]

Check to see if you accidentally have the fan header set as DC?

Make sure that the hub doesn't have a specific spot that one speed controllable fan has to be in for sending signal to the others?

Artic fan hub, for instance, controls all 10 fans based on the one in #1 connection slot.

 

[Paperdoc]

I expect you have not made an important setting in BIOS Setup.

Background first. This is a HUB which can work ONLY if used with a mobo header that DOES provide the PWM signal. And it can control the speed of ONLY 4-pin fans. You have those requirements mostly. Next, recognize that the mobo header can deal with the speed signal sent back to it from only ONE fan. So the HUB will send back only the speed signal from the fan in Port #1, and all other fans' speed signals are ignored entirely - you will never see them anywhere. You can expect all those identical fans to behave exactly the same since they all get the same signals. The speed signal is NOT used at all for fan speed control! So it does not matter! The fan speed is decided by the mobo solely on the basis of the TEMPERATURE measured by a sensor. However, that speed signal is used by the mobo header for an important second function. It monitors that for NO speed signal, indicating fan failure. If that happens it pops a warning on your screen and you must investigate and fix the problem. BUT since the header can only monitor ONE fan's speed and no others, from time to time YOU should check whether all fans still are working.

The TEMPERATURE sensor I mentioned above is different for two fan groups. The CPU_FAN and some related headers use only the temp sensor built into the CPU chip itself, and this guides cooling of the CPU. The SYS_FAN headers often have an option that YOU can choose - to use either that CPU sensor, of a different one on the mobo. For case ventilation fans make sure it is set to the mobo sensor.

Your post indicates (but does not say clearly) that the ONLY fans on this Hub are for case ventilation. So I am assuming that the actual CPU chip cooling systern is connected to the mobo CPU-FAN header. If that is WRONG, post back here. But if right, then the Hub input from the mobo should be from one SYS_FAN header, and that must be set to use the mobo temp sensor. But you ALSO MUST set another option for that header. The Fan MODE options normally include PWM Mode, Voltage or DC Mode, and often Automatic. For use with this Hub and 4-pin fans, that must be set to PWM Mode. Voltage or DC will NOT get you fan speed control through the Hub, and automatic certainly can make a mistake and set itself to Voltage when it should not.

After you have made those two configuration settinge for the SYS_FAN header usesd to feed the Hub, remember to use Esc to back out to Main Menu, then go to the Exit Menu (often by the F10 key) and choose to SAVE and EXIT. This willl save your settings and reboot.

 

[IAXEM]

Check to see if you accidentally have the fan header set as DC?

Make sure that the hub doesn't have a specific spot that one speed controllable fan has to be in for sending signal to the others?

Artic fan hub, for instance, controls all 10 fans based on the one in #1 connection slot.

Nope, its on PWM. I have to assume spot #1 (the only one that works) would be that central reference connection.

I expect you have not made an important setting in BIOS Setup.

Background first. This is a HUB which can work ONLY if used with a mobo header that DOES provide the PWM signal. And it can control the speed of ONLY 4-pin fans. You have those requirements mostly. Next, recognize that the mobo header can deal with the speed signal sent back to it from only ONE fan. So the HUB will send back only the speed signal from the fan in Port #1, and all other fans' speed signals are ignored entirely - you will never see them anywhere. You can expect all those identical fans to behave exactly the same since they all get the same signals. The speed signal is NOT used at all for fan speed control! So it does not matter! The fan speed is decided by the mobo solely on the basis of the TEMPERATURE measured by a sensor. However, that speed signal is used by the mobo header for an important second function. It monitors that for NO speed signal, indicating fan failure. If that happens it pops a warning on your screen and you must investigate and fix the problem. BUT since the header can only monitor ONE fan's speed and no others, from time to time YOU should check whether all fans still are working.

The TEMPERATURE sensor I mentioned above is different for two fan groups. The CPU_FAN and some related headers use only the temp sensor built into the CPU chip itself, and this guides cooling of the CPU. The SYS_FAN headers often have an option that YOU can choose - to use either that CPU sensor, of a different one on the mobo. For case ventilation fans make sure it is set to the mobo sensor.

Your post indicates (but does not say clearly) that the ONLY fans on this Hub are for case ventilation. So I am assuming that the actual CPU chip cooling systern is connected to the mobo CPU-FAN header. If that is WRONG, post back here. But if right, then the Hub input from the mobo should be from one SYS_FAN header, and that must be set to use the mobo temp sensor. But you ALSO MUST set another option for that header. The Fan MODE options normally include PWM Mode, Voltage or DC Mode, and often Automatic. For use with this Hub and 4-pin fans, that must be set to PWM Mode. Voltage or DC will NOT get you fan speed control through the Hub, and automatic certainly can make a mistake and set itself to Voltage when it should not.

After you have made those two configuration settinge for the SYS_FAN header usesd to feed the Hub, remember to use Esc to back out to Main Menu, then go to the Exit Menu (often by the F10 key) and choose to SAVE and EXIT. This willl save your settings and reboot.

Yes, CPU/AIO fan is plugged into CPU_FAN while the pump itself is on CPU_OPT (Was going to switch it to AIO_PUMP but as it seems that both are virtually the same and the guide even suggested the former, I left it as-is)

The hub is plugged into CHA_FAN2 (Originally CHA_FAN1) and already set to PWM mode. There is no SYS_FAN header.
I switched the source from CPU to motherboard, and that yielded no results.

I'm working with an ROG Strix Z370-E (fairly old, but it was gifted to me and is now in a less powerful system than my main). Here's a diagram from the manual showing all the fan inputs.

 

[Paperdoc]

You appear to have this all installed and set correctly. No Hub should behave that way when installed correctly. Check on the fan configuration screen (manual p. 3-7) for the CHA_FAN header that the Profile option along the bottom is set to Standard. Assuming it is, then your Hub may be faulty if it cannot control PWM fans.

 

[IAXEM]

You appear to have this all installed and set correctly. No Hub should behave that way when installed correctly. Check on the fan configuration screen (manual p. 3-7) for the CHA_FAN header that the Profile option along the bottom is set to Standard. Assuming it is, then your Hub may be faulty if it cannot control PWM fans.

Damn, I suppose I'll have to contact Antec then.

I had already suspected it may be a faulty hub, but wanted to be sure I wasn't missing anything obvious.