Symptom
After upgrade to fix related defect CSCvy10601, some Catalyst 9200L switches continue to report fan failure messages, but reported faulty fan can be observed still operational / spinning.
The messages displayed constantly
%PLATFORM_THERMAL-6-FRU_FAN_RECOVERY: Switch 1: System fan # recovered to normal status
%PLATFORM_THERMAL-1-FRU_FAN_FAILURE: Switch 1: System fan # failed
show environment fan
Switch FAN Speed State
---------------------------------------------------
1 1 5160 OK
1 2 0 NOT PRESENT or FAULTY
* Physically the FAN # works although it displayed the error messages
* The temperature of the device is in normal parameters
Conditions
* Must be running a fixed version for CSCvy10601
* FAN # reports a failure
* FAN # shows a message that it recovered
* Reload doesn't help, message comes back after a while
Workaround
- Reload (Fix the issue temporarily)
If reload does not clear condition then power cycle.
The workaround is temporary.
Further Problem Description
- The FANs show a failure message and that the FAN recovers by itself, FAN # works although this message comes out continuously
- CSCvy10601 contained adjustments to fan monitoring parameters. Some devices continue to report fan failure despite fan functioning normally. Contact Cisco TAC if you are running a fixed version for CSCvy10601 and you suspect this issue.
- The defect CSCwc77585 addresses the issue partially.
Complete resolution of the issue is provided by the fix of the defect - CSCwd56540.
Fix is available in the CCO version of 17.3.7, 17.6.5, 17.9.3, 17.11.1 and later releases.
