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So there are a few possibilities that can cause your problem. Either the thermistor sensor above the light fixture isn't reading the temperature properly, or the damper assembly is stuck open. You'll want to remove the vent cover on the front of the damper enclosure to check the damper. The damper is mounted just below the ceiling inside the refrigerator section against the back wall. It's the air vent in the middle that blows air out into the refrigerator. The front vent face just pries off to expose a couple screws. Remove the cover and check the damper which is just a flap that opens and closes to allow air into the refrigerator from the freezer. The damper should be closed to stop air from flowing into the refrigerator if the refrigerator gets too cold. Try to force the damper close and if it re-opens before the temperature raises, then you need to replace sensor above the light fixture. If the damper doesn't open or starts working like normal again then possibly the damper was/is jammed and the damper would need to be replaced if it still can't regulate the temperature properly.
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The damper assembly is part number W10207517, but the thermistor sensor isn't listed in the parts diagram so you'd need to contact a parts store directly to look up the sensor
Yes, I'm 100% certain. How else do you think it senses the temperature inside? This unit uses a display control board not a mechanical thermostat. But again that is why you need a parts store to look up the part because it's not shown on the parts breakdown which is why I can't give you the part number either. I believe part number 12002355 will work but I can't say for certain if it works for this unit or not.
Hello again. I'm just following up because I haven't heard back from you and I see this question is still open and unrated. Is there anything else I can help you with?