Help us improve your experience.

Let us know what you think.

Do you have time for a two-minute survey?


Troubleshooting the Cooling System on the SRX1400 Services Gateway


The services gateway cooling system consists of a fan tray and an air filter, both of which are located in the side of the chassis and plugged in from the rear of the chassis. The fan tray contains two fans. The fan tray provides cooling to the components installed in the device.

An air filter installed in the rear of the chassis helps keep dust and other particles from entering the cooling system. To function properly, the entire cooling system requires an unobstructed airflow and proper clearance around the site, as described in Site Preparation Checklist for the SRX1400 Services Gateway.

During normal operation, the fans in the fan tray function at less than full speed. The Routing Engine constantly monitors the temperatures detected by sensors and services gateway components, adjusting the speed of the fans as necessary. If the services gateway temperature exceeds the acceptable maximum, the Routing Engine turns off the power supplies.

Table 1 describes the alarm conditions and corrective actions for SRX1400 Services Gateway cooling system.

Table 1: SRX1400 Services Gateway Cooling System Alarm Conditions and Corrective Actions

Alarm Conditions

Alarm Indications on SYSIO Card

Possible Cause and Corrective Action

The services gateway fan has failed.

Red (critical alarm LED)

  1. Use the CLI to get information about the source of an alarm condition:

    user@host> show chassis alarms
  2. If the CLI output lists only one fan failure and the other fan is functioning normally, the fan is most likely faulty and you need to replace the fan tray, as described in Replacing the Fan Tray on the SRX1400 Services Gateway.

The services gateway fan tray is removed

Red (critical alarm LED) and Yellow (non-critical alarm LED)

Reinstall the fan tray.

The device temperature is too warm.

Yellow (non-critical alarm LED)

The Routing Engine constantly monitors the temperatures detected by sensors and device components, and adjusts the speed of the fans as necessary.

Tip: Place your hand near the exhaust vents at the side of the chassis to determine whether the fans are pushing air out of the chassis.

The services gateway temperature is too high, either because of an internal overheating condition or because the maximum recommended room temperature has been exceeded.

Red (critical alarm LED)

The services gateway shuts down automatically in four minutes.


The services gateway shuts down automatically if the device temperature exceeds the threshold value. In this case, the Routing Engine will also be in the off state, and you must press the POWER button to power on the device again.