C9500 48Y4C PSU fan noise

[xuechen02200]

Hi,

we recently purchased a C9500 48Y4C which came with one PSU populated and a blank plate covering the other PSU slot.

Once power it on, the fan on the PSU runs constantly at 100% which generates enormous loud noise. There is nothing yet connected to the switch, and we're currently at room ambient temperature running IOS 16.9.4.

there is a suggestion that we need to have the second PSU slot populated to bring down the fan level inside the first PSU.

is that true? or do I have a bad PSU? 

[balaji.bandi]

This looks for me Bug,, We had some issue same before with version 16.9.2 - later upgrade to higher version got fixed (may not be the case with you,) but try different higher version or  stable one and check.