What fault occurs when the ALM indicator of a board is on

When the ALM indicator of a board is on, the most possible cause is that the temperature of the board exceeds the upper limit. The hermetic cabinet is not well ventilated. If the dust concentration in the equipment room is high, especially in the areas with heavy blown sands, the air filter may be blocked, which affects ventilation. As a result, the temperature in the chassis rises considerably. You need to clean the air filter in this case. The air filter is installed at the rear of the S7700&S9700 chassis. You can loosen the screws to remove the air filter.
If the air filter is not blocked but the environment temperature is high, you can run the display temperature slot slot-id command to check the temperature of the board.
In addition, the failure of fans also causes high temperature of boards.

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