[Refrigerators] Why does refrigerator make beeping sound?

Why does refrigerator make beeping sound?

  Symptom

              1. The product beeps every 30 seconds.

  Reason

             1. If shelves and bottle racks are not assembled properly, door cannot be closed completely .

  How to fix

              1.   Check if the door is closed completely. If beeping sound continues, reassemble shelves and racks. 
               (Check doors and refreshment center)

           2. Contact the service center if the symptom persists.

            [Check if the door or refreshment center door is open.]