I am with you.. I have had mine since Nov 2012...with very noisy fans even on low speed...now the pump is making grindng /gurggling noises...LED's have stopped working...etc, etc. I have a Corsair H100i GTX Cooler. After staying up til 4am (I started getting this issue after a bios update), I figured out what was wrong. The bios pump fan was set to auto. The cooling unit itself has two cables to plug in, a SATA power connector, and a pump sensor cable. The SATA power connector should be connected directly to an available SATA power cable from your PSU, and the 3 pin (with only a single sensor wire) fan connector should be plugged into your CPU fan header on the motherboard. The sensor cable relays pump RPM information to both the BIOS and to the Corsair Link V2 software, and lets your motherboard know that you have a CPU cooler installed. I am still concerned about this 39C idle coolant value. It's 26.9C in this room right now. Coolant temp is 28.6C. Computer has been up and at idle for the last 2 hours. +2C over ambient is on the lower side, but most people are in the +4-6C range even in tight cases. I would not expect to see 39C unless your room is 35C. If it's not, we need to find out why. I don't like this continual warming with the fans maxed out. That should not happen unless you are running a stress test. You need to be very meticulous with the data collection. A +7C delta might be "slightly warm", whereas +9-10C I would consider in trouble. The margins are that fine in detecting and you to be very precise since we can't see what you see. However, I am getting around the around the problems...plugging the fans into the motherboard and letting the BIOS manage them. Still noisy at 1200 rpm but way better than the pump managing them. LED's I can live without. The pump noise is now worrying me as the temps seen to rising but will persevere until a fix is available as I need my system.

The H100i v2 is a great CPU cooler for users who want to keep their components cool and stable. It’s a little more expensive than other options, but the performance it provides makes it worth it. Again we see the new cooler’s Performance mode tying the older cooler’s Quiet mode, but at lower noise levels. That is a big win, folks! And if you’d prefer, you can always switch into Quiet mode, and get excellent results with around the same noise level as the average air cooler. In case you needed any reminder on this point, the older cooler’s noise level at load was simply ridiculous. If you wanted to show off your shiny new build to your friends, its 54.5dB noise level would leave them thinking your PC was on its last legs. There’s no other way to say this: the older H100i sounded broken at load.It's fairly difficult to keep piling on heat with the fans at maximum, at least from CPU heat. What were you doing at the time? If you heat the case up with the GPU, you might see this. Not related specifically to fan control, but it would be good to figure out if there is something wrong with the cooler. What kind of room and case temperature do you have? When sitting at idle on the desktop, what is the coolant temperature? Does it stay level or slowly creep up? Your current set up of pump/AIO header and fans/CPU Fan is viable, but you are missing out on the benefits of the cooler. Fan speed does not affect CPU temp directly and on most recent CPUs, you will see very dynamic changes in CPU temp for normal desktop operations. You don't need your fans to spike to 1500 rpm because you open iTunes. Some boards have fan delays to ameliorate this (including Asus), but the actual results are mixed. On some of my Asus boards the delays don't work. The delays on CPU fan are already short, but all three of my X99 and Z370 boards ignore the delay setting on CPU fan. The only reason to run this way would be if you can't or don't want to run the Link/iCUE software. In that scenario, board control is better than no control.

I understand this thread is a few months old now but I decided to share how I fixed my issue with the Cooler disconnecting/reconnecting. We used our high-end test platform to test the coolers, which consists of the following components: The Corsair H100i v2 is an air cooler that has a rated lifespan of about 6 years.”}},{“@type”:”Question”,”name”:”Is the Corsair Hydro Series Good?”,”acceptedAnswer”:{“@type”:”Answer”,”text”:”I think it doenst matter what is the inicial temperature because If I start the computer with the default setting of starting ICUE when the computer starts, it starts as acelerated as before. radiator: Our Hydro Series coolers utilize a 120mm or 140mm radiator, thus the 240mm radiator provides about double the cooling surface. It will fit in almost any case with twin 120mm fan mounts that are spaced enough for a 240mm radiator. If the cooler was malfunctioning with very high coolant temperature, it might shift to maximum to protect itself. However 39-41C should not override any custom fan curves or fixed speeds. It might override the default Quiet fan setting. What kind of fan curve are you using? All right, with the introduction out of the way, it’s time to get into the nitty-gritty of Corsair’s former and current best-selling coolers! Now that the unit is mounted, we will want to plug in power cables for both of the fans and the pump. The H100i has an integrated 4-fan hub which is where you will want to plug in your H100i fans. You will find two ports on top of the cooling unit, where you can plug in the included fan power adapter cables. Each adapter will support two fans, and by plugging the fans directly into the fan power adapter cable and into the cooling unit, you will be able to monitor and control the H100i fans through the Corsair Link V2 software.