This article explains why the log message “fru FPM fru-model-number is NULL” appears every six seconds in the chassisd log on EX9200 devices.

Starting with Junos OS Release 23.2, EX9200 devices may repeatedly generate the following log messages in chassisd:

Jan 7 08:30:21 fru FPM fru-model-number is NULL
Jan 7 08:30:27 fru FPM fru-model-number is NULL
Jan 7 08:30:33 fru FPM fru-model-number is NULL

• The jinsightd daemon monitors health-related information on multiple Juniper platforms, including EX9200, MX, and PTX. In Junos OS 23.2, jinsightd subscribes to chassisd by default and polls device data every six seconds.
• During this polling process, the daemon checks the FRU model number. Because the FPM board does not have a model number, the system logs the missing model-number entry.
• While these messages appear frequently, they do not indicate a hardware fault or affect device performance. A fix is planned to prevent these repeated messages from appearing, as this behavior is expected for the FPM board.