Issue with D5 Pump

[Sito85]

Hi everyone,

I have been having issues with my EK-XRES 140 Revo D5 PWM and was hoping someone could give me some advice on what to do.

I am running a single pump, dual 360 radiator + 120 radiator, CPU + GPU water cooled system. It has been running fine for 3 years and during that time I have purged, cleaned and replaced the coolant 3-4 times.

A couple of months ago I started having issues during boot. I was getting the "no CPU fan connected" message on startup, however, the pump was running fine. A simple reset would fix that issue and the system would start just fine. That only lasted for a month or so and then I noticed that the pump wasn't starting at all.

I read online that it could be gunk on the D5 pump so I opened it up and cleaned thoroughly, although it wasn't dirty at all. I also checked for friction marks on the impeller and the reservoir housing but couldn't see anything out of the ordinary.

Cleaning it seemed to fix the problem for a week or so but today the error just popped up again and I worry that the pump won't run at all in a couple of weeks.

I have considered replacing the pump only since the reservoir is fine. Any comments will be greatly appreciated.

Here's a picture of the system, in case it helps:

https://imgur.com/a/pT7w44K

 

[godevskii]

It seems the pump is dying, its not gonna be the res since it worked fine for 3 years. Have you checked the ball bearing underneath the impeller assembly?

 

[Sito85]

Heyy godevskii, thanks for your reply.

Yes, I checked it and everything looked fine. However, I have also read that replacing the o-ring could help. Since o-rings are inexpensive, I will try that and see if it fixes the problem.

 

[EarthDog]

I'd guess the pump is going bad too. Make sure the signal line/the connector is on or maybe switch headers on the mobo (disable cpu fan message) and molex too,, otherwise, get another.

 

[maxfly]

Is the cpu header also the pump header on your mb?

 

[Sito85]

Hi maxfly,
Yes, the CPU_FAN is where the pump connects to the motherboard.

 

[godevskii]

Do what @EarthDog said, check the molex connection to make sure that it delivers clean 12v power, and check the 4 pin connector for the pwm signal you can also try to connect to a different port, if all that is OK then the culprit must be the pump.

 

[Sito85]

I checked the molex as suggested and it outputs 12v.
I have it set at full speed (4750 RPM) and has been working fine. I will leave it as is for now and change the o-ring when it starts failing again. Just FYI, this model uses a NBR 60x3 mm o-ring, in case someone reads this and has the same problem.

 

[MaddMutt]

I would also recommend running a fan monitoring sevice ( I sure Asus has one). This will tell you the RPM's of the pump during use. Does it run full out in use or does it fluctuate? The O-Ring would be a possible cause if the coolant level was slowly doing down or you had a leak around the base of the Res. The D5's that I found online, have a 2yr warranty. Getting a Full 3yrs of constant use out of it is great I know having to buy a new one ($75~$100) kind of sucks but it is the engine that drives your cooling system. Unless you have changed the coolant recently, I would also recommend new coolant with your new pump.

 

[Sito85]

Hi MaddMutt,

I have a desktop widget running all the time that gives me RPM, temps, usage, etc. It fluctuates from 4753-4856 RPM. Not sure if that's a lot.
So far I haven't seen any leaks of fluid level going down in the reservoir. I have read that the o-ring could flatten over time and when you tighten the pump against the reservoir, usually after flushing/cleaning, you inadvertently tighten it harder than what it was and it ends up rubbing against the reservoir housing. I didn't find any rubbing marks when I inspected it but I wouldn't disregard that option due to the age of the loop.

As you suggested, I am planning on doing a full flush and cleaning of the system and waterblocks when replacing the o-ring.

Also, I am running 2x 360 rads + 1x 120 rad on that one pump. Do you think that is too much for a single pump to run through? There are also 5x 90° fittings along the loop. To be honest, adding the 120mm rad didn't really help with temps so I've been considering removing it for a while.

Pump used is: Ek-xres-140-revo-d5-pwm-incl-sleeved-pump

Thanks again for all your answers,

 

[godevskii]

The D5 is capable of handling that amount of rads with no problem, mine is handling the exact same amount and so far is still strong, almost 8 years of high use now.

 

[Sito85]

Hey godevskii, have you ever replaced the o-ring? What are your thoughts on running it at 100% constantly?

 

[godevskii]

The 1st 5 years no, but about +/-3 years ago i changed reservoir and it came with a new o-ring so i used the new o-ring despite not having any problems with the old one. As for the speed i've always maintained the pump on max speed (about 4800 rpm).

 

[Sito85]

I read once that running a pump at 100% for long periods of time was not a good idea. I am glad to hear there isn't any concerns with doing so.

I will change the o-ring as soon as I receive it just to be safe.

 

[EarthDog]

I dont think there is any harm...but there is little point in running these at full tilt in most loops in the first place.

 

[Sito85]

Hi EarthDog,

I totally agree with you. I usually run it at 30-40% but since I have been having the problems outlined above, I decided to run it at 100% to make sure it doesn't get stuck duting booting.

I appreciate everyone's answers to my thread.