Aurora R7, motherboard fan rules

What liquid cooler did you use?

Try connecting the pump tach cable to the FAN_CPU motherboard header.

Howdy Professor, thanks for the quick reply! Well... I'd prefer we leave the specific components out of it if possible. Im trying to understand what the "rules" of the mobo fans are and I'll adjust accordingly.  That being said:

1. I migrated the mobo and cpu to a "cooler master haf xb" evo case
2. Replaced the RAM with 32 (16x2)g of G.Skill Aegis Series 16GB DDR4-2666 PC4-21300
3. Replaced the power supply with EVGA SuperNOVA 1000 GT 80 Plus Gold 1000W
4. Replaced the video card with ASUS NVIDIA GeForce RTX 2060 Dual Evo Overclocked Dual-Fan 12GB
5. Replaced the CPU cooler with the Corsair H100i Elite Capellix
6. I've added fans all over the place:

2 front fans that came with the case + 2 fans that came with the cooler pump are sandwiching the radiator and set to intake.

Then, I have a Cooler Master MasterFan MF200R exhaust on top of the case.
Then Corsair LL120 RGB exhaust on the back top.
Last, 2x Cooler Master Sleeve Bearing 80mm Silent exhaust fans in back bottom.

Preferably, all fans plug into the H100i's controller and the pump fan plugs into the cpu header on the mobo.  That throws an error and I've tried almost every other combo using all four fan headers. No matter what I still get the cpu fan error and this rig is running cool.

Post Body:

Howdy Professor, thanks for the quick reply! Well... I'd prefer we leave the specific components out of it if possible. Im trying to understand what the "rules" of the mobo fans are and I'll adjust accordingly.  That being said:

1. I migrated the mobo and cpu to a "cooler master haf xb" evo case
2. Replaced the RAM with 32 (16x2)g of G.Skill Aegis Series 16GB DDR4-2666 PC4-21300
3. Replaced the power supply with EVGA SuperNOVA 1000 GT 80 Plus Gold 1000W
4. Replaced the video card with ASUS NVIDIA GeForce RTX 2060 Dual Evo Overclocked Dual-Fan 12GB
5. Replaced the CPU cooler with the Corsair H100i Elite Capellix
6. I've added fans all over the place:

2 front fans that came with the case + 2 fans that came with the cooler pump are sandwiching the radiator and set to intake.

Then, I have a Cooler Master MasterFan MF200R exhaust on top of the case.
Then Corsair LL120 RGB exhaust on the back top.
Last, 2x Cooler Master Sleeve Bearing 80mm Silent exhaust fans in back bottom.

Preferably, all fans plug into the H100i's controller and the pump fans plugins into the cpu header on the mobo.  That throws an error and I've tried almost every other combo using all four fan headers. No matter what I still get the  cpu fan error and this rig is running cool.

@unclewoosha 

The number on the Fans themselves are 7FM05

If you use a 7M0F5 fan mounted somewhere else with a y SPLITTER that has the 4 wire connection going to the 7M0F5 and then the 3 wire connection going to the actual CPU fan the error will go away.

Noctua-NA-SYC1-SPLITTER Cable B07655KMKV

The 511 error is due to non pwm fan and or not enough RPM for the fan.  Dell fans can go as high as 3000 to 4500 rpm.

You are going to need a fan that passes the startup diagnostic test connected to the TOP_FAN header. Corsair LL Series fans do not pass. The Dell OEM fans pass and the Corsair ML120 Pro fan will pass. The OEM AIO cooler was drawing power from PUMP_FAN. This causes BIOS to detect a liquid cooled CPU, and it will not look for a CPU fan. Since your new H100i is drawing power using SATA direct from the PSU, BIOS is detecting your CPU as air cooled. Connecting the pump tach cable to CPU_FAN is sufficient to pass diagnostic test as a CPU fan (at least with the Corsair H60 AIO).

Drop some photos of your new rig so we can see what is going on inside.

it is not the fan header on motherboard but the type of non-Dell fan you use that can cause error.  

One R10 user reported using the fan for Dell liquid cooler:

“For my case, I used a Noctua NF-F12 PWM. After pluging my pump and the fan in the right headers, no boot error.

this thread also talks a lot about which fan does not throw the bios error.

Aurora R7, After Market Cooling - Dell Community

zoomed outheaders in top of photo and right

Thanks! I ordered this y connector and a Corsair ML120 Pro. I think this might do it because it is a PWA fan. I'll try that 7M0F5 next if this doesn't work or the problem manifest with a different fan header after I resolve the CPU_FAN.

"headers in top of photo and right" is wrong. Its left and top.

I've come across the idea of TOP_FAN requiring something connected to it before but I've tried plugging almost everything into it. As stated, my current setup is pretty straight forward. All fans plug into the h100i controller, then the pump tach into the CPU_FAN header. This is the way the manual for the icue h100i said to do. That leaves TOP_FAN, PUMP_FAN, and FRONT_FAN empty. The boot error is about the CPU_FAN. That being said, I do fear if I manage to fix CPU_FAN error it will throw a TOP_FAN next, but it isn't complaining about that for now.  By Thursday, I'll have the "Corsair ML120 Pro" (which is a PWM fan from what I understand --which is why it supposedly fixes the issue). I will try plugging this into each slot 1 by 1 to see if it works. Additionally, a y connector is in the mail so I can plug a special fan into the same header if need be. Lastly, I ordered a PCIe card with an internal USB 2.0 header so I can plug the controller fully properly.  Once these new parts all arrive I should be able to experiment fully and I'll report back here. 

While you are waiting for your ML120 Pro fan to arrive, your can do some testing with the Dell OEM fans that came with your Aurora R7. Just lay them in the bottom of the case or somewhere out of the way and connect to the circled fan headers.

Following the instruction manual for your Corsair H100i will not work for your Del proprietary motherboard. The diagnostic test will want a "passable" fan in each case fan header. You do not need to have anything connected to PUMP_FAN, because, as previously mentioned, your rig will be detected as 'air cooled'.

Interesting. I'll give this a shot in a second. I pulled both of the OEM fans (one off the radiator and one off the back) from the original setup. I see no third fan in the original setup. I put one oem in CPU_FAN (white to white) and booted to a TOP_FAN error.  Then I put the other oem in the TOP_FAN header and booted up to a FRONT_FAN error.  So it seems like all three are required. My assumption is that when I try what you suggest I'll still get a CPU_FAN error but I will try shortly. If I'm understanding correctly, you basically need an OEM fan plugged into all three headers (CPU_FAN, TOP_FAN, and FRONT_FAN).

I have to disagree unless that is a typo.  All my fans are 3 pin and the mobo hates them all.