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DDC Startup Problem

post #1 of 18
Thread Starter 
Over the past few weeks I've noticed random issues where my pump won't start when the PC starts. When I watch the pump, I see the impeller do a couple spins (less than 1 second), stop, spin again, then stop. Turn off the computer and try again. Usually by the fourth boot, it spins normally.

To me that sounds like a power draw issue, though my prior pump did that after a leak. I don't believe I'm near my 750HX's power limit, but I don't have a way to tell either. With my prior pump, I noticed the same issue with only the pump connected, which is why I bought this second one (damn Swiftech and their warranty!).

Any ideas what this might be? I really don't want to buy a third DDC in four months.
 
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post #2 of 18
Do you have any active cooling on the pump? How is it mounted, sandwich style?
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post #3 of 18
Thread Starter 
No active cooling, other than the front and side fans on the HAF X. It's mounted to the cable cover using two screws and the shock pad (non-stuck) which has been cut around the screw holes.
 
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post #4 of 18
It might have overheated. Those pads make the heat issue even worse.
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post #5 of 18
what type of pump you have and how you have it connected , most DDC's need 7~8W to crank from dead
    
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post #6 of 18
Thread Starter 
MCP355 w/ EK top

It's connected using the 4 pin molex with RPM lead on the mobo's CPU header.
 
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post #7 of 18
Quote:
Originally Posted by Angrybutcher View Post
MCP355 w/ EK top

It's connected using the 4 pin molex with RPM lead on the mobo's CPU header.
Try to connect the pump to spare/separate 4 pin molex ,make sure your top is not to tide,try 3in1 oil;
http://www.overclock.net/water-cooli...l#post13538966
you can PM bmaverick..he knows this pumps in and out
    
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post #8 of 18
Thread Starter 
Thanks much for the link. I'll try some of those things with my former DDC and see if I can salvage it. Then I'll work on the installed one
 
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post #9 of 18
You probably kill it with the top being installed too tight and the impeller is hitting it. I got one like that if you knock it a few times it will start. If its under warranty just send it back for a replacement. Its quite a common issue and also happens to older models.

The top only need to have the oring seal to not leak, mine was with a xspc top before and the pump lasted 2 weeks before it clicks and you have to knock it or restart a few times to get it to spin up.
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post #10 of 18
Thread Starter 
Unless they changed recently, swiftech warranties are void if you remove the top. Besides, the pump isn't dead, just a pain to get spinning lol


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Crucial C300 128gb Samsung F4 2TBx4 Raid5 LG Bluray Combo GPU - HK GPUx3 
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