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648PRO Professional Refrigeration Door Ajar Alarm


  • How long does a door need to be open before the door ajar alarm beeps? Can this time be adjusted?
  • Can you adjust the volume of the door ajar alarm?
  • How do you turn the door alarm off or on in a 648PRO model? Can you disable the door ajar alarm?
  • Does the door ajar alarm work for the refrigerator and freezer?
  • Why is the door ajar alarm only working for the refrigerator or freezer side?
  • Door ajar alarm going off even with door closed; causes of door ajar alarm
  • Door alarm or bell icon flashing


648PRO Refrigeration Alarm

To turn the door ajar alarm on or off on 648PRO products, press the Alarm key on the control panel.

Door Alarm Tips

  • The door ajar alarm sounds after 60 seconds of the door opening.
  • The amount of time before the alarm sounds and the door ajar alarm volume are not adjustable.
  • The alarm pitch and tone are not adjustable.
  • The alarm monitors both the refrigerator and freezer door(s) and drawer(s).
  • When the door ajar alarm is on, the bell icon appears in the display panel indicating it is working.
  • The bell icon appears in both the freezer and refrigerator external displays.
  • When the door ajar alarm is on and the door is left ajar, the alarm icon flashes.
  • If the freezer is open, the freezer side icon flashes. If the refrigerator is open, the refrigerator side icon flashes. If both sides are open, both icons flash.
  • When the door ajar alarm is off, the bell icon does not appear in the display panel.
  • It is not possible to turn the alarm on for only one section.
  • The alarm sounds until the door is closed, or the alarm is turned off on the control panel. Press the Alarm key to turn the alarm off.

Door Ajar Alarm Troubleshooting

Beeping with Door Closed

  1. If the door ajar alarm sounds and the door appears closed, something is blocking the door from closing. Refer to Door Will Not Close for more information.
  2. Power down the unit at the control panel using the unit on/off button.
  3. With the unit off, monitor for 15 - 30 minutes to see if the beeping continues.
  4. Restore power to the unit. If the beeping continued with the power supply to the unit turned off, the noise is not coming from the refrigerator.
    • Often beeping noises thought to come from a Sub-Zero are from another appliance in the kitchen such as a dishwasher, garbage disposal or oven. Verify the other appliances in the kitchen are not the cause of the noise.
  5. If the alarm is coming from the product and still does not stop with the door closed firmly, the door switch at the top or bottom of the door near the hinge may not be closing properly. Factory Certified Service is required to resolve this issue. Contact them to set up an appointment for repair.

Door Ajar Icon on but Chime Does Not Sound

  1. If the door ajar alarm icon is on but the chime does not sound, or if the chime has become hard to hear, reset the breaker for 10 seconds.
  2. If the alarm works for only one side, refrigerator or freezer, the alarm is sensing the door switch. If the door is slightly open but the switch is not sensed as open, the alarm may not work.
  3. Opening the door fully and see if alarm turns on after one minute.
  4. If the door ajar icon still appears after the steps above are complete, no further troubleshooting advice is available. Contact Factory Certified Service to schedule an appointment for repair.

See also:


Need further assistance? Contact Customer Care at 800.222.7820 or provide your information below and request a Customer Care representative contact you.

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