Turning The Controller On Or O - Navien NR-21DU Manual

Turning the Controller On or O

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To turn the controller on or o , press the Power
button.
When the power is on,
The LCD display turns on.
The LED indicator turns green.
Hot water temperature is displayed.
When an error occurs, the LED
Note
indicator turns RED and blinks (except
for Cascade mode).
The backlight stays on for 8 seconds
when a button is pressed.