The router was unreachable since the cards, including the one from where the ssh connection was made, were down due to temperature issues as the lower air filter was damaged
The routers' temperature increases, but no fan issues were detected or alarms raised (except the ones for the FPCs overtemperature) Other equipment on the room were not experiencing any temperature issues
Nov 20 21:04:09.841 icr02.str02 chassisd[9959]: CHASSISD_ZONE_BLOWERS_SPEED_FULL: Fans and impellers in zone 0 being set to full speed [system warm]
Nov 20 21:04:09.515 icr02.str02 craftd[9963]: Minor alarm set, FPC 7 Temperature Warm
Nov 20 21:04:10.001 icr02.str02 chassisd[9959]: CHASSISD_FRU_HIGH_TEMP_CONDITION: FPC 7 EA0_HMC2 DRAM botm temperature 99 over 98 degrees C (but no fan/impeller failure detected)
Nov 20 21:07:09.637 icr02.str02 chassisd[9959]: CHASSISD_TEMP_HOT_NOTICE: FPC 8:EA0_HMC1 Logic die temperature of 111 degrees C is above limit (107 degrees)
Nov 20 21:07:09.637 icr02.str02 alarmd[10350]: Alarm set: FPC id=520095848, color=RED, class=CHASSIS, reason=FPC 8 Temperature Hot
Nov 20 21:07:09.637 icr02.str02 craftd[9963]: Major alarm set, FPC 8 Temperature Hot
> show chassis alarms
5 alarms currently active
Alarm time Class Description
2023-11-16 19:33:02 UTC Minor FPC 0 Temperature Warm
2023-11-01 05:34:45 UTC Major FPC 1 Temperature Hot
2023-10-29 21:45:19 UTC Major FPC 7 Temperature Hot
2023-08-24 05:40:35 UTC Major FPC 8 Temperature Hot
It was confirmed the lower fan filter was damaged and did not allow a proper airflow inside the chassis. however there is no alarm for the filter as there is no i2c polling from this component, for that same reason there is no serial number shown under the show chassis hardware output.
For this case, the filter was quite damaged and got destroyed when removing it, so we could not confirmed any dust or debris or any other specific reason of the failure.
The failed filter had to be replaced
It is recommended to replace the filter elements every 6 months.
https://www.juniper.net/documentation/us/en/hardware/mx2010/topics/task/mx2010-maintain-air-filter.html