A refrigerator rarely fails with a bang. It drifts warmer, frosts unevenly, leaks a little, and the food inside gives the warning before the appliance does. If nobody is looking, the first sign is a smell. The job is to notice the drift early, while the fix is a cleaning or a new seal and not a replacement.

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What goes wrong

Four things cause most of the drift. The door seal tears or stops sealing, so warm air gets in every time the door opens. The coils behind or under the unit collect dust and pet hair and lose the ability to shed heat. The unit gets pushed against a wall or cabinet and loses airflow. The door gets left slightly open, often because someone is carrying groceries in and never closes it fully. Each of these is visible, and you can check most of them with a flashlight.

Recognize it early

Watch for a top shelf that runs warmer than before, condensation that never dries, frost building up in the freezer or on the back wall, a door that seals only with a push, a motor that runs longer than it used to or cycles on and off more often, water pooling under the unit, and food that spoils earlier than its date. Track what goes into the trash each week. A growing pile of spoiled food is the clearest signal, because it shows the fault is in the box and not in the shopping.

Check the seal and the coils

Close the door on a dollar bill at several points around the gasket. If the bill slides out easily anywhere, the seal has a gap there. If the unit has a lower grille or a back cover you can reach, look at the coils for a grey mat of dust. A vacuum with a brush attachment handles that. Unplug the unit before you do any of it, and pull it forward only as far as the cord and any water line allow.

Your next move

Tonight, put a standalone thermometer on the middle shelf and write the reading and the time on a card. Check it again the next morning and at the same time the day after. A reading that climbs over two days, plus any one sign above, is enough to call a repair person and ask what they check first. Keep the card on the fridge so the next person who opens it can add a line.