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Please see here all relevant information surrounding Digivoice, a previous Urmet Door Entry system.
Why is the “DU” LED of the power supply on for a 1038/20?
Why is the “ON” LED of the power supply red and flashing on a 1038/20?
Why is the “ON” LED of the power supply unit off on a 1038/20?
Why is the “ON” LED red on a 1038/20?