A:Answer Hi Cook.
Thank you for reaching out regarding your Samsung - 30" Wide, 22 cu. ft. French Door Fingerprint Resistant Refrigerator on how to switch back on the door alarm. I am sorry to learn your alarm stopped. Regarding your concern, all you need to do is to press the Alarm On/Off button to turn the door open alarm on and off.
I suggest you check this link to your user manual for assistance. Please go to page 19.
https://downloadcenter.samsung.com/content/UM/202108/20210820130659841/DA68-02657A-12_IB_IBACI_EN_ES_FR_200907.pdf
Should you need more assistance, please feel free to get back to us via the following options:
1. Facebook Messenger: http://m.me/samsungsupport
2. Twitter: https://twitter.com/messages/compose?recipient_id=18768513
3. Samsung Community: https://us.community.samsung.com/t5/Samsung-Community/ct-p/us
Reference Ticket Number: 1144669140
Thank you for being a valued customer of Samsung. Have a great day.
^Camille