Captain 120 ex water cooling pump wont start

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savagemessiah115

Feb 21, 2018
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So I have this issue... ti where I turn on my pc everything turns on but after a short moment the water pump powers off and my system wont display... i just installed it and I've plugged the pump into "cpu-fan" I've plugged the fan into "cpu-opt" I've plugged 2 additional fans into sys fan!
Side note I've upgraded 3 components
Went from standard fan to water cooler

Went from ryzen 5 to ryzen 7

Went from 1050ti to titan xp

Running on gigabyte gaming ab350 gaming 3

Edit: I've pulled out all the ram to see if that was the problem, obviously the pc still wont post but the water cooler doesn't shut off... I've played with the ram but no matter where I put the stick... the cooler shuts down
 
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Paperdoc

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Oct 19, 2006
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You have not told us what mobo you have, but I suspect it is sensing shortly after start-up that the CPU is cool, so it is trying to slow down the "fan" on the CPU_FAN header. But really, that item is the pump, Moreover, I suspect (cannot verify this from the system web page) that the design intends that the pump should run full speed all the time, and temperature control of the CPU is done by changing the speed of the FANS on the radiator, NOT the speed of the pump.

The fan is a 4-pin unit, so it obviously uses a PWM Mode of control from its mobo header - no problem. The pump connector is 3-pin, so it would respond to the older DC Mode of speed control. IF it were connected to a mobo header that uses only PWM Mode, it would run full speed all the time, which I suspect is what you want. BUT on many mobos the CPU_FAN header claims to automatically sense the type of fan plugged into it, and change its control Mode to match. So, what MAY have happened is that the CPU_FAN header has figured out that the pump you plugged in there is 3-pin type and changed itself to use DC Mode for control so that it CAN (and IS doing) control the pump speed. You can defeat this in one of two ways with settings in BIOS Setup for the CPU_FAN header. You could go there, ensure that it is using DC Mode, and tell it to run the fan full speed all the time, instead of using the normal "Standard" or automatic control scheme. OR, you can go there and manually set that header to use the PWM Mode for control. This will force it to use that mode (which technically is the wrong way for controlling 3-pin fans), and this mis-match of control schemes will cause that pump to run full speed all the time, no matter what the control scheme tried to do. After making any changes, be sure to SAVE and EXIT.
 
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savagemessiah115

Feb 21, 2018
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Forgive me for failing to post my solution, so... after even closer analysis of my cooling issue I realized something, my gpu runs abnormally cool, I know that's saying something but after benchmarking the hottest my gpu got was 50° and averaged at 47° I decided to oc my CPU to push up the temp, after doing so my pumps lights began to glow indicating that it was in fact running as liquid can be observed flowing through a glass tube, not quite sure what the issue was, perhaps the pump has a heat sensor I was unaware of, or maybe the stroke of luck was but a coincidence, none the less ... it is working, thanks for the help!
 
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