This article explains the meaning of the below mentioned alarm

user@host> show chassis alarms

Alarm time              Class Description

2024-11-04 10:28:58 IST Minor FPC0: TSensor 5:Sensor RearMiddle Ex Too Warm

• The following logs were observed on the device

Oct 31 19:41:55 [Alarm SET] Object 143 reason 64 Device FRU TEMP SENSOR 10, reason TSensor 10 Too Warm(FPC0: TSensor 10:Sensor FrontMiddle 1 In Too Warm), color 2, slot 0 Alarm id 239918291
Oct 31 19:41:55 send: yellow alarm set, device FRU TEMP SENSOR 10, reason FPC0: TSensor 10:Sensor FrontMiddle 1 In Too Warm
Nov 1 10:18:07 {chassis, shutdown-on-re-over-temperature, 0x3 0xca8
Nov 1 10:18:07 {chassis, overtemp-quick-shutdown, 0x3 0xca9060}
Nov 1 10:18:07 {thermal-health-check, shutdown-timer, 0x3 0xdbdff0

• The device will shut down unexpectedly.

If  the EX device observed the below mentioned alarm. "FPC0: TSensor 5:Sensor RearMiddle Ex Too Warm,"

The alarm will appears if the temperature sensor in the rear middle of FPC0 is reporting an excessively high temperature. That may lead the over temperature issue and also shutdown the device.

• Verify the show chassis environment command check All fan are working fine
  
  

user@host> show chassis environment

     FPC 0 Fan Tray 0 Fan 1        OK        Spinning at full speed

     FPC 0 Fan Tray 1 Fan 0        OK        Spinning at full speed

     FPC 0 Fan Tray 1 Fan 1        OK        Spinning at full speed

     FPC 0 Fan Tray 2 Fan 0        OK        Spinning at full speed

     FPC 0 Fan Tray 2 Fan 1        OK        Spinning at full speed

     FPC 0 Fan Tray 3 Fan 0        OK        Spinning at full speed

     FPC 0 Fan Tray 3 Fan 1        OK        Spinning at full speed

     FPC 0 Fan Tray 4 Fan 0        OK        Spinning at full speed

     FPC 0 Fan Tray 4 Fan 1        OK        Spinning at full speed

Verify the threshold values are fine as below.
 

user@host> show chassis temperature-thresholds

                                                       Fan speed     Yellow alarm     Red alarm     Fire Shutdown

                                                       (degrees C)     (degrees C)    (degrees C)     (degrees C)

Item                                                Normal High  Normal Bad fan  Normal Bad fan    Normal

FPC 0 Sensor FrontMiddle 1 In            43   61      64      64      68      68        73

• Observe the  " FPC 0 Sensor RearMiddle Ex " Value as below      

user@root> show chassis environment

Class Item                                      Status    Measurement
Power FPC 0 Power Supply 0            OK        40 degrees C / 104 degrees F
     FPC 0 Power Supply 1             OK        39 degrees C / 102 degrees F
Temp FPC 0 Sensor FrontLeft 2 In      OK        42 degrees C / 107 degrees F
     FPC 0 Sensor Center              OK        57 degrees C / 134 degrees F
     FPC 0 Sensor FrontLeft 3 In      OK        45 degrees C / 113 degrees F
     FPC 0 Sensor Frontleft 1 In      OK        41 degrees C / 105 degrees F
     FPC 0 Sensor RearLeft Ex         OK        51 degrees C / 123 degrees F
     FPC 0 Sensor RearMiddle Ex       OK        57 degrees C / 134 degrees F
     FPC 0 Sensor CPU Die Temp        OK        67 degrees C / 152 degrees F
     FPC 0 Sensor RearRight Ex        OK        52 degrees C / 125 degrees F
     FPC 0 Sensor FrontRight 1 In     OK        46 degrees C / 114 degrees F
     FPC 0 Sensor FrontRight 2 In     OK        48 degrees C / 118 degrees F
     FPC 0 Sensor FrontMiddle 1 In    OK        58 degrees C / 136 degrees F
 

• Ensure that the power supplies match the airflow direction of the fans. Mismatched airflow can cause overheating.
• Check the ambient temperature in the room where the device is located.
• restarting the chassis control process: shell user@host> restart chassis-control           
•  By doing this will reinitialize the power to the FPC during the mw and may clear any transient issues and clear the alarm TSensor 5:Sensor RearMiddle Ex Too Warm

If the alarm is still persist even after restart chassis-control we need to replace the fpc.