X370 Taichi Problem with fan header

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I want to connect the rear fan on CHA_FAN3 and run in DC mode. 
I made the changes in the BIOS under HW Monitor but the fan doesn't change, instead it runs at nearly 100% all the time. 
I tried all settings including Custom mode. 
The two front fans are connected to CHA_FAN1-2 and they respond to similar changes as they should. 
Tested with another fan to check that if it's the header that's causing the problem.
But the result get the same, is it faulty motherboard?

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keacques Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 12 May 2017 Status: Offline Points: 3	Post Options Post Reply Quote keacques Report Post Thanks(0) Quote Reply Topic: X370 Taichi Problem with fan header Posted: 16 May 2017 at 3:35pm
	I want to connect the rear fan on CHA_FAN3 and run in DC mode. I made the changes in the BIOS under HW Monitor but the fan doesn't change, instead it runs at nearly 100% all the time. I tried all settings including Custom mode. The two front fans are connected to CHA_FAN1-2 and they respond to similar changes as they should. Tested with another fan to check that if it's the header that's causing the problem. But the result get the same, is it faulty motherboard?

Wachtel Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 07 May 2017 Status: Offline Points: 13	Post Options Post Reply Quote Wachtel Report Post Thanks(0) Quote Reply Posted: 17 May 2017 at 3:33am
	See my recently updated post on the same subject. You can't use that header for a 3-pin fan.

ASRock_TSD Members Profile Send Private Message Find Members Posts Add to Buddy List ASRock_Official Joined: 20 Mar 2015 Status: Offline Points: 8907	Post Options Post Reply Quote ASRock_TSD Report Post Thanks(0) Quote Reply Posted: 12 Jun 2017 at 12:45am
	Dear keacques, Greetings, this is ASRock TSD. For X370 Taichi, there are three chassis fan connectors, CHA_FAN1, CHA_FAN2 and CHA_FAN3. CHA_FAN1 and CHA_FAN2 could control both 3pin and 4pin fan, but CHA_FAN3 could only control 4pin fan. As your system, please install a 4pin fan on CHA_FAN3 to control it. If your fan is 3-pin, it may not able to get control of it. Here is the specification as below. Link: http://www.asrock.com/mb/AMD/X370%20Taichi/index.asp#Specification About detailed fan type specification and information, please refer below link. http://www.asrock.com/support/faq.asp?id=427 Thanks! All the best, ASRock TSD

heliopetuous Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 28 Mar 2019 Status: Offline Points: 2	Post Options Post Reply Quote heliopetuous Report Post Thanks(0) Quote Reply Posted: 28 Mar 2019 at 6:04pm
	Hi, I have met the same problem, but I have also tried connecting 3pin fan to CHA1, and no matter how I adjust in BIOS, the fan is always running in full speed. My x370 taichi BIOS version is 5.1, which is the latest version by now. Please help.