In what conditions will the SYS indicator on AR routers be steady red

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The SYS indicator on an AR router is steady on in the following conditions:
-The device temperature is too high or too low.
-The card temperature is too high or too low.
-The system fails to obtain the device temperature consecutively three times.
-The system fails to obtain the card temperature consecutively three times.
-Fans are not available or have failed.

Other related questions:
What does it mean when the SYS indicator on the CE series switches is steady red
On the CE8800&CE7800&CE6800&CE5800 series switches (except the CE6850-48T4Q-EI), the steady red state of the SYS indicator means one of the following: - The system fails to start. - At least one power module does not work normally. - At least one fan module does not work normally. On the CE6850-48T4Q-EI, the steady red state of the SYS indicator means one of the following: - The system fails to start. - At least one power module does not work normally. - At least one fan module does not work normally. - The card power consumption exceeds the rated power of the power modules.

Why is the indicator of a fan module steady red or blinking red on CE switches
Possible Causes 1. The fan module is not installed properly in the fan slot. 2. Fan blades are blocked or stop rotating because of heavy dust. 3. The fan module is faulty. Troubleshooting Procedure 1. Pull out the fan module and reinstall it to ensure that it is securely installed in the slot. (Fan modules are hot swappable.) 2. Remove the fan module from the chassis and check whether the fan blades are blocked or whether there is too much dust on the fan blades. a. If fan blades are blocked by an obstacle, remove the obstacle. b. If the fan blades have heavy dust, use a brush to clean them. 3. If the problem persists, install another fan module of the same model into the fan slot. If the new fan module can work properly, the original fan module has failed and needs to be replaced.

Server red indicator on
If a server indicator is red, an alarm occurred. For details about the meanings of indicators of a specific server model, type the question in the format of "Product model + Indicator name + Status", for example, "RH2288 V3 HLY Blinking red."

Indication of the red alarm indicator on the Metro 1000
If the alarm indicator on the Metro 1000 is steady red, a critical alarm is generated. You need to check it on the NMS.

Indication when the SRV indicator on the TOM board is red
The SRV indicator is a service alarm indicator. The indicator status is described as follows: On (green): The service is normal. On (red): A critical or major service alarm is present. On (yellow): A minor or remote service alarm is present. Off: No service is configured.

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