MODEL: N74A1-63510/N74A3-63610/N74B1-63510B/N74B3-63610B
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2.Basic Setting & Usage
2.1.The Function of PC Board
A. Time of day indicator
Light on, display the time of day.
Light flash，remind you to reset the time of day if electrical service
interrupted 3 days more. (If electrical service interrupted within 3 days, it
doesn’t need to reset the time. )
B. Button lock indicator
Light on, indicate the buttons are locked. At this moment, press any
single button will not work. (No operation in one minute, will light on and
lock the buttons.)
Solution：Press and hold both and for 5 seconds until the light
off.
C. Program mode indicator
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