Fan problems with r710 "Fan 1 RPM is operating less than the lower critical threshold."

I have downgraded the idrac firmware to 1.99 and it still has the fan issue.  Is it the motherboard then?

Another follow up, I've removed the iDRAC enterprise card from the motherboard and now I'm getting fan failures on 1 and 2.  Should I also remove the express controller card?

I have also faced my R730xd server, error message is "Fan 1 RPM is less than the lower critical threshold". I have changed the full cooling fan set & changed both power supplies. no change to the problem.
Any solutions in this regard?

Network_khor,

I would suggest you start with verifying the server is completely up to date. Once that is done, and if the issue persists, I would power down and then check the fan itself for debris, damage, or fault connection. If none of those are present, and the issue is still present, then I would swap fan1 with another one in the server, and then see if the issue follows the fan, or stays with the slot. This can help us identify if the issue is with the fan itself. 

Let me know what you see.

I found another issue, when both Power supply is running then the server is run and showing output to monitor, If one Power supply is take off then the power is down monitor output is off but PSU yellow light is on, cooling fan is off also.

what is the solution?

Are you mean remote access like Anydesk or Team viewer? 

Hello thanks for choosing Dell.
We would need to see the part component status (fan status) from iDRAC.
https://dell.to/42xlfO2
page 21

Here I attached Fan status. 

1. I have update the bios 2.15 to 2.16, swap the fan 1 but problem is same. 
2. showing no error power supply in idrac status. but when I take off PSU 2, cooling fan set totally off, Monitor output off also.  System board indagator light is on, PSU light status is on which is powered. 

I am getting frustrated.

Hi, I would like to suspect a hardware issue on the server. But which part is hard to say for me. Also, are there any warning messages in the System event log? like"the Inlet Temp Sensor(SEL1514) error" if you have like this warning it should be a power interposer board issue. Or a batch of cables that provides power to the fan, which can potentially cause the fan to communicate intermittently, leading to the above errors. Other than that sometimes a warm reboot or iDRAC reset may help to solve this issue. https://dell.to/3JFOky7

The problem is fix after changing the Motherboard. Thanks @Dell-ErmanO @DELL-Young E @DELL-Chris H for giving me suggestion to solve the problem.

Hi, thanks for your feedback, have a good one!