256bits
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Seems like your other control panel lights are faulty as they are out.Ivan Seeking said:
There should possibly be an indicator light for standby, power on, . .. depending upon the application.
Too bad - someone removed the control panel cover, perhaps for servicing, and did not replace.
It is quite difficult to say what the indicator light actually represents just from the picture.
A wild guess out of the blue would be that your system is in standby.