[Jimmeh]

I recently installed a new Heatsink fan into my ASUS P8Z77 V-LX (i5 -3570k OC'd to 4.3Ghz). The installation went well in my opinion, but within the first couple of hours of installation AI Suite II started Giving me a warning, CPU fan 0 RPM. I looked up solutions to this on the internet , many saying AI Suite is inaccurate and worth ignoring.

BUT, I also read CPUID's HW Monitor is very reliable, so I pulled both AI Suite and HW Monitor up. Everytime AI Suite warns me about the CPU fan being 0 RPM, the RPMs on HW monitor also change. For Example I as soon as I saw the AI Suite warning I would check HW monitor, and it seems that was reading 0 RPM too! Before my eyes I'd see 750 RPM turn to 0 RPM. Yet I can see and hear my Heatsink fan (Which is an Arctic Cooler Freezer Pro 7 REV2 if that makes a difference) spin as usual.

I tried wiggling the PWM fan header a bit, but it made no difference. I've rebooted a couple of times and I have seen the American Megatrends screen appear twice, stating 'CPU fan error!'.

I do not know what else to try. So if anyone could help me out It would be greatly appreciated!!

 

[StayFrosty]

Check your cables/connections.

 

[doyll]

What Stay Frosty said.
Is fan actually stopping when you get 0rpm reading?
Check the wires going into plug. Blue & Green are rpm and PWM signal wires.

 

[Jimmeh]

No, the fan isn't actually stopping, i'm just getting the 0 RPM readings :c

 

[StayFrosty]

I'm think that it's not getting any power so just take a look at your connections and you should be fine.

 

[Munkypoo7]

AI Suite is worth ignoring. It's garbage... my opinion anyways, I found it to be bloated, slow and useless on my Sabertooth while I was waiting for my MPower RMA.

Most likely it's just your board not reading the speed properly for one silly reason or another. Regardless, as long as you can verify the fan really isn't stopping, that it is constantly active, simply enter BIOS / UEFI and disable the CPU Fan warning and you're set.

If it's worth anything, using the ULNA on my D14, the Sabertooth also sometimes complained of my fans being at 0RPM, that's when I noticed they were spinning just fine. Disabled the warning within UEFI and I was set. This was also an issue on my x58 EVGA SLI3 board. Again, not sure why. Least the MPower isn't complaining (yet)

 

[doyll]

Okay. Sounds like a signal problem.

Does fan actually speed up when you see 0rpm?

This would indicate rpm signal not getting to mobo and 0rpm reading causes PWM signal to increase pulse to increase rpm.

 

[Jimmeh]

Well the warning hasn't appeared in around 15minutes now, but It didn't seem to speed up when it hit '0 RPM'

EDIT: It seems to happen more when I'm Idle.

 

[Jimmeh]

I've unplugged the PWM, checked the wires, and plugged it back in. Everythings seems fine but still I'm getting the Errors.

In reply to doyll, The RPM went to 0 on HWMonitor and for a split second is went to 4500 then back down to 0, then a steady 700RPM.

But, if anyone can confirm, as long as these are false readings, I could just ignore them and carry on like normal?

 

[doyll]

I wouldn't worry to much.

Does this happen at other than just 700rpm? Like at higher rpm? Wondering if it's something to do with low rpm warning setting being at 700rpm threshold doing it.

 

[Jimmeh]

Well when gaming, I haven't seen the warning.
In the BIOS it's set at 200RPM before giving me the warning (If you know what I mean)

 

[edsai]

I have the same board P8Z77-V LX and the Hyper 212 with two PWM fans (XtraFlo).

The FAN Xpert can test the fan speed.
The CPU FAN always spin even at 0% fan power.

The Asus Suite sensor should work.

You can ignore only the CPU temp.
The Asus sensor shows the CPU TCase temp and don't the core temp.

I'm using the latest bios and the Asus Suite version but I never had this issue with the old bios version.

You can find the latest bios and the Asus Suite here:
http://www.asus.com/Motherboards/Intel_Socket_1155/P8Z77V_LX/

 

[doyll]

Turn off the fan speed warning.
Set the CPU temp warning to just above what you normally get as max temp. Assuming that is well below maximum safe operating temp. Doing this means if your CPU goes above your normal operating temp you will get a warning and you can sort it. Be it your filters needing cleaned, your cooler needed cleaned or something more serious. Kinda like your satnav saying you are over the speed limit

 

[kiwiasian]

See if the yellow wire is correctly connected to the 4-pin connector. Yellow wire is RPM reporting wire.

Or, you could plug it into a 3-pin SYS_FAN connector so that the motherboard will ignore CPU fan warnings (since nothing is plugged in)

 

[Jimmeh]

UPDATE:
Just had a warning from AI Suite II saying something along these lines:
+5 7.720v

D:

PS. Thankyou for all the help about the Fan, I'll be fiddling around with those settings later!

 

[Jimmeh]

Does this image help solve anything?

 

[DEW21689]

Go into your BIOS, check your CPU fan configurations is it set to auto, pwm, or voltage? you may want to try manually setting it to pwm if you are using a pwm (4 pin) fan connector.

 

[Jimmeh]

In reply to DEW, I couldn't find the CPU fan configs anywhere?

I don't know if they just aren't there or I'm not looking hard enough.
Do you know which Tab (in Advanced Mode) it is in etc?

 

[edsai]

1) I'm also receive voltage warnings.
These warnings could be only wrong readings.

I believe that the HWMonitor shows more accurate informations.

Anyway it's always recommended to use good quality power supplies.

2) Your board doesn't have these CPU FAN options: auto, pwm and voltage.

You can see these options in some boards by Gigabyte.
These board has these options to control both 3-pin and 4-pin fans.

Your Asus board you can find in the bios the CPU Q-FAN Control (Enabled/Disabled) and the CPU FAN Profile (Standard, Silent, Turbo and Manual).

The fan speed can also be changed in the FAN Xpert.

3) In the fan test the CPU FAN at 10% shouldn't be 0 rpm.

My Chassis Fan 1/2 can report 0 rpm at 0%, 10% and 20%.
But the CPU FAN should run always.

What is the heatsink that you're using?

4) I would recommend to contact the Asus Tech Support about the results in the fan test.
Maybe the board is working correctly and the heatsink fan has some issue.

 

[Sp33d Junki3]

Go into bios (Advance mode)
Look under Monitor, select the CPU . Make sure it is not set to N/A
You should see the fan speed in the bios.