Long continuous beeping sound from motherboard while stress testing CPU

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I am stress testing with XTU, currently 5 hours in. 1 hour ago my board started beeping, a long continuous beep, but after 6-7 minutes it stopped. Debug code was A0, which is the one always displayed when on Windows (IDE initialization is started).

It is doing it again now, this time it hasn't stopped (about 30 minutes). Should I worry? I haven't set any alarms in the BIOS but I notice that one of my case fans is stuck at 1551RPM in both HWMonitor and EasyTune. All fans are working properly though, and temps are in the high 60's/low 70's.

Should I close XTU and restart or is it nothing to worry about?
 
I started another stress test and after a couple of hours the beeping is back. According to HWMonitor and EasyTune my CPU fan is at 0RPM. Both CPU fans are working fine, so there must be something wrong with the sensor? All health settings are disabled in BIOS.

Any ideas?
 
is it the warning beep from easytune? usually it beeps if fan speed is at 0% or below what you set it to

test by uninstalling easytune for now
 
The sound is coming from the case speaker, and I don't have any alerts enabled in EasyTune.

Sometimes when I am loading windows, I get an error "PreSensorDetector has stopped working", is that from EasyTune?

EDIT: Yeah PreSensorDetector is from EasyTune. I got this error when I was loading Windows a few minutes ago, but HWMonitor and EasyTune show that CPU fan is at 133RPM and when I am getting the beeping it is at 0RPM or constantly changing from o to 1300...
 
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only way to be sure is uninstall easytune then see if it still does it

can always re install it later

cant think whatelse it can be other than a 0 rpm fan warning buzzer
 
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