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PTX10003 may generate a Major Fan Tray Failure even when the Fan is not failed.

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Article ID: TSB17768 TECHNICAL_BULLETINS Last Updated: 12 May 2020Version: 1.0
Alert Type:
PSN - Product Support Notification
Product Affected:
JNP10003-160C [PTX10003-160C] and JNP10003-80C [PTX10003-80C]
Alert Description:
PTX10003 may generate a Major Fan Tray Failure even when the fan has not failed.

To confirm if the fan has actually failed or not; Please run the CLI command "show chassis fan". If both the Fans in the failed tray are still rotating with 45% rpm to 50% rpm; Then it can be concluded that Fans tray has not failed and it’s a False alarm.

Replacement of the Fan tray in not required if the Fans in the failed Fan Tray in rotating with 45% rpm to 50% rpm
.

Below is an example of false alarm.

user@router> show system alarms 
1 alarms currently active
Alarm time               Class  Description
2020-03-17 22:53:47 PDT  Major  Fan Tray 4 Failure


user@router> show chassis fan 
      Item                      Status   % RPM     Measurement
      Fan Tray 0 Fan 1          Ok       99%       13466 RPM               
      Fan Tray 0 Fan 2          Ok       91%       10570 RPM               
      Fan Tray 1 Fan 1          Ok       98%       13284 RPM               
      Fan Tray 1 Fan 2          Ok       93%       10802 RPM               
      Fan Tray 2 Fan 1          Ok       98%       13284 RPM               
      Fan Tray 2 Fan 2          Ok       93%       10802 RPM               
      Fan Tray 3 Fan 1          Ok       99%       13466 RPM               
      Fan Tray 3 Fan 2          Ok       93%       10802 RPM                
      Fan Tray 4 Fan 1          Failed   49%       6687 RPM   
<<<<<<<<<<<<<<< Fan 1 of the failed Fan Tray is running at 49% RPM                        
      Fan Tray 4 Fan 2          Failed   49%       5649 RPM   
<<<<<<<<<<<<<<< Fan 2  of the failed Fan Tray is running at 49% RPM              

A router running one of the following Junos Evolved versions may generate a false alarm described above:
  1. 19.1R2-EVO
  2. 19.2R1-EVO
  3. 19.3R1-EVO
  4. 19.3R2-EVO
  5. 19.4X50-EVO
  6. 19.4R1-EVO
Solution:
A software fix has been deployed in 19.4R2-EVO. 
If you cannot upgrade the software, a workaround to clear the alarm is to either:
    a. re-seat the fan tray for which the alarm is raised, or
    b. reboot the router.
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