I’d like to explain how I resolve the situations
from Bug CSCvg59274 on Cisco ASR9901.
I’m not sure if it’s the best way because there is no information on Cisco TAC yet.
◆(1)FAN0 isn’t working
FAN0 got out of order.
LED of FAN0 turned off.
◆(2)Exchanged the fault FAN0.
◆(3)LED of FAN0 is still off.
Though you already exchaned the fault FAN,
LED of FAN0 is still off because of CSCvg59274.
◆(4)Plug off FAN0 a little.
Make it semi-inserted position.
◆(5)Plug off FAN1 a little.
Make it semi-inserted position.※Plug off the normal FAN.(FAN1 or FAN2)
You must do (6) immdediately (withing 5 seconds).
◆(6)Insert FAN0 completely.
You must do (7) immdediately (withing 5 seconds).
◆(7)Insert FAN1 completely.
◆(8)FAN0 will be normal soon.
◆(9)Wait for a while.
FAN speed is changing.They’re getting normal.
◆(10)Trouble is cleared.System is all green.
I’m willing to update if I get any information.