Sub-Zero Door Ajar Detection Fault

Door alarm sounds even when doors appear closed; alarm cannot be silenced for long.

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Possible Causes

Misaligned door or sagging hinges, Damaged door gasket preventing full seal, Faulty door switch or magnetic sensor, Items inside preventing full closure

How to Fix / Troubleshooting

Safety first: Avoid slamming doors; this can damage hinges and glass shelves.

Step 1 – Check for obstructions

  • Inspect shelves and bins to ensure no items are protruding and hitting the door.

Step 2 – Inspect gaskets and closure

  • Check that the door gasket is not folded or torn.
  • Close the door slowly and watch for any points where it bounces back or fails to seal.

Step 3 – Test door switch/sensor

  • Manually press the door switch; the alarm should stop and lights should go off.
  • If not, test and replace the switch or magnetic sensor.

Step 4 – Adjust hinges

  • If the door is sagging, adjust hinge screws or leveling legs to raise and align the door.
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Repair Difficulty

Easy 2/5

Required Part

Door Gasket
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