The flashing yellow LED is known as the "Function LED". It indicates whether the 900-4RL board is set to four-zone controller (4TD) function, automatic operator (AO) function, or secure interlock (SI) function.
In the 4TD function, the LED will flash 1 time every 5 seconds.
In the AO function, the LED will flash 2 times every 5 seconds.
In the SI function, the LED will flash 3 times every 5 seconds.
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