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Swiftech MCP655 PWM pump won't start, was working before.

post #1 of 4
Thread Starter 
Hello everyone,

I am having a very frustrating problem. I built my water cooling pc and everything was working fine for a couple of weeks. I just drained my loop to make a minor installation. I didn't install the backplate on my GPU initially because it was on backorder with FrozenCPU. So I drained the loop, took out the graphics card, installed the backplate and put everything back together.

Now when I use a paper clip to power the PSU to fill the loop, the pump just won't start. I did nothing to the pump, didn't touch it when I was installing the back plate. I have no idea why it won't start. It worked perfectly for a solid two or three weeks of heavy use.

Do you have any suggestions why the pump won't start? I know the PSU is working because the fans start up, the fan controller lights up, every other component will be powered just fine using the paper clip method.

I would REALLY not like to have to have to RMA the pump and wait for a replacement. It makes no sense that the pump would just die when I didn't touch it and it was working perfectly an hour or two ago.

Any suggestions would be VERY appreciated.
post #2 of 4
Is the pump connected to your PSU directly? It should start regardless of the PWM signals as it will run 100% speed without the PWM pins connected.

Another thing to try is to use a different 4-pin molex cable, any PSU should have multiple.
    
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CPUMotherboardGraphicsRAM
Intel i5 3570K [Delid] Asrock Z77E-ITX EVGA GeForce GTX 1080Ti FTW3 HyperX Fury 16GB 1866 DDR3 HX318C10FBK2/16 
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post #3 of 4
I have the same pump and problems like these before after using more than 5 pumps. It could be a number of reasons but before you rma, you could check if there are air bubbles ,sometimes I power the pump and the water doesn't circulate or as kokin mentioned wire contact is also a common problem.

Good luck!
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post #4 of 4
Quote:
Originally Posted by jrodefeld View Post

Hello everyone,

I am having a very frustrating problem. I built my water cooling pc and everything was working fine for a couple of weeks. I just drained my loop to make a minor installation. I didn't install the backplate on my GPU initially because it was on backorder with FrozenCPU. So I drained the loop, took out the graphics card, installed the backplate and put everything back together.

Now when I use a paper clip to power the PSU to fill the loop, the pump just won't start. I did nothing to the pump, didn't touch it when I was installing the back plate. I have no idea why it won't start. It worked perfectly for a solid two or three weeks of heavy use.

Do you have any suggestions why the pump won't start? I know the PSU is working because the fans start up, the fan controller lights up, every other component will be powered just fine using the paper clip method.

I would REALLY not like to have to have to RMA the pump and wait for a replacement. It makes no sense that the pump would just die when I didn't touch it and it was working perfectly an hour or two ago.

Any suggestions would be VERY appreciated.


If you have the 4 pin connector plugged to the mobo CPU header, but obviously don't have the 24 pin plugged to the mobo, and suspect not the 8 pin either, the PWM line to the pump from that connector may be still connecting to ground, typically thru the GPU's and PCIe connections, and if so, the PWM version of the D5 won't run.

For general information, the PWM D5 runs at 60% when the PWM wire is not connected to a signal, and it stops, or won't start, if the PWM line is connected to ground.

Unplug the 4 pin connector from the mobo cpu header, or whatever it's plugged into, and all should be well.


Darlene
Edited by IT Diva - 4/25/14 at 10:25am
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