is this a faulty PSU?

[baselzind]

recently i had a two stack WS-C3850-24T-L  switches showing this below , does this means the two unknown PSU are faulty and in need of replacement? or they are not connected to power? i cant check them pysically

SW PID Serial# Status Sys Pwr PoE Pwr Watts
-- ------------------ ---------- --------------- ------- ------- -----
1A    PWR-C1-350WAC XXXXXXXX OK Good Good 350
1B    Unknown Unknown No Input Power Bad Bad 235
2A    Unknown Unknown No Input Power Bad Bad 235
2B    PWR-C1-350WAC XXXXXXXX OK Good Good 350

[Leo Laohoo · Accepted solution]

Could be an IOS bug or both "bad" PS don't have any power input connected.

[baselzind]

it turns out the psu isnt connected to power!? it doesn't make sense why this message looks very deceiving showing "unknown" and "bad", also the PSU wasn't showing even in the show inventory

[Mark Malone · Accepted solution]

Hi
Its a BUG as Leo said this looks like the ID , had so many PSU bugs on the 3850s , we just gave up reading the output and would get eyes on if we thought there was an issue as many of them seemed to be carried through multiple IOS version s
example

show env power shows "bad" and unkown for PS not connected to AC
CSCvb63422
Description
Symptom:
When power supply unit is inserted into a switch and the power cable is not connected to the PSU then "show env power all" shows incorrect Watts and PID/Serial# are unknown. It recovers and shows correct values once the power cable is connected.

Conditions:
PSU is inserted and power cable is not inserted.

Workaround:
NA - (Inserting the power cable will solve this show CLI issue)