You have the unit in dark mode. Press the Dim/Dark button again to get the unit to full brightness. THe unit has 3 levels of DIM. First the unit is at its full brightness, pressing the dim/dark button will dim the display and the unit functions normally. Press the Dim/Dark button again will futher darken the display but when the unit alarms the display is turned off and remain off during the alert. After the alert is over the unit waits 20 seconds of no alert to turn the display back on.
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