What should I do if the door alarm keeps sounding?
The door alarm sounds if the door is left open for more than 2 minutes, and the alarm indicator will blink. You can toggle the alarm on and off by pressing the Door Alarm button. If the door is left open for 5 minutes, internal lights will also blink to alert hearing-impaired users, which is normal behavior. (Page 54)
From the official Samsung Rf28r7351sg manual, page 54
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