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H100i V2 query: Fans are going nuts over conflicting temp readings


sophosuni
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I am hoping someone can help. I have had my current system since December 2016 with no problems to speak of outside of some software glitches. Spec is in my profile.

 

I had a problem a week ago where the system would not boot past BIOS as the CPU fan was not functioning. I have a H100i V2 watercooler on the CPU and plugged in the CPU fan header. I took the side of the case off and the fans were running. I left it a while and rebooted to find everything working fine, but then the CPU temp rapidly climbed to 99 Celsius, but I had no system shutdown and the system seems stable. I have had occasional grinding/scratching sounds from the water pump but it seems to be working although the sensor generally settling between 45 celsius and 55 celsius. Neither of the tubes in and out of the waterblock are particularly hot.

 

All the case fans are going nuts at times, rapidly changing from whisper quiet to full power and then back again.

 

I have contacted Scan who I bought the system off for help, but they are closed due to Covid 19 and already have a rapidly growing waiting list of tickets for maintenance requests.

 

I thought about buying a replacement H100i, but am unsure if it is this that is starting to fail. A problem with the CPU or just a temp sensor that is causing errors? I have no spare parts to swap out the CPU or watercooler to check if they are functioning.

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Make sure CPU Fan or whichever header is powering the H100i v2 is set to 100%, disabled, or however your BIOS describes a 12v state. For Asus, that is "Full Speed" in the EZ BIOS or "Disabled" fan control in the the Advanced BIOS -> Monitoring section. This will revert back to the standard fan curve on BIOS update or potentially any crash where you have to clear CMOS or something similar. Lack of the necessary voltage to keep the pump and fans running could definitely cause the surging.

 

If this does check out and the header is already at Full Speed/Disabled, then there may be a power problem on the unit. When this first happened or in subsequent attempts when starting from a cold boot, you can witness the CPU temp climbing upwards relatively quickly in 45..50..55..60...80..85..90.. increments. If you power on and the CPU jumps back and forth between 35 and 90C, that is a different issue and not cooler related per se. If the pump is not running and you heat the coolant up to 80C or whatever, it will remain at the temperature until it naturally cools off. That can take hours in this state with no moving fluid and subsequent attempts to boot up will be hard since you will start off at 80C before Windows loads.

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