Ek D5 pump not detected in BIOS or in Windows.

[Winnie_21]

Hello all,

I have recently completed my first hard-line water loop, and have included the EK EXRES 140 D5 PWM pump res combo. https://www.ekwb.com/shop/ek-xres-140-revo-d5-pwm-incl-sl-pump
The CPU is Ryzen R7 1800x on the ROG Crosshair VI Hero.

I'm having some control issues with the pump. It runs off a Molex cable and a PWM cable for RPM control. When first built, everything worked fine with the pump being recognised in the BIOS and in ASUS Fan Xpert 4. I was able to control speeds, however, Fan xpert 4 allows for Max CPU temp of 75 degrees before ramping everything to 100%.
This is where my first issue arised. Due to AMDs 20c temp offset on my 1800x, it would regularly hit the 75 degree limit and ramp my fans and pump to 100% under some gaming load, then quickly drop it back down to my set 30-50% as soon as reported temps hit 74 or lower. This obviously was not good for the pump nor my sanity.

I fixed the fans by setting the temp readings to GPU, which was far more stable at around 45 degrees. However the W_PUMP+ header on the Crosshair VI only allows for CPU reading, so the pump kept ramping up and down whilst gaming or doing moderate work. I decided to try and fix it by plugging the pump's PWM header into the CHA_FAN header, which allows for GPU temp control.
Since doing that, no matter what, my BIOS and Fan Xpert no longer recognise the pump at all, and thus the pump runs at 100%. I tried going back to W_PUMP+ but no luck.

The PWM still works, as in the BIOS I can control the pump speed using Q-Fan control. However once booted into Windows and Fan Xpert takes over, it ramps to 100% immediately and won't slow down. I'm worried for the life of the pump and also its quite loud for a fully water cooled system.

I have the latest BIOS and have reinstalled Fan Xpert with no luck. I have also tried other fan headers including CPU and CPU OPT.

Has anyone had any experience with this? I've been searching the internet for days and have not been able to find a solution.

 

[Seanie280672]

That version of the d5 pump isn't controllable via software or the bios, you need the PWM version to control it, the thin blue wire from the pump to the fan header is for speed monitoring only, not controlling, as it gets its power from the molex connector not the header, you can only slow down the pump or speed it up with the little red dial on the bottom of the pump, I run mine at between 3 and 4.

 

[Winnie_21]

Thanks for the reply. I definitely own the PWM version. It has the green and blue wires from the header and was working prior to disconnecting from the W_PUMP+ header. There is no red dial on the pump. At least, I have no seen one.

 

[Winnie_21]

Hello all,

I managed to find a solution.
I believe the RPM reader on the pump is busted. I can't be bothered draining the loop and removing the pump-res to return it just for that.
Thankfully, Q-fan in the ROG C6H bios will still allow for PWM control even if it does not detect the pump. I uninstalled ASUS Ai Suite and Fan Xpert, and am just using the BIOS to keep the pump at a quite yet cool 35%.

Happy for this to be closed.