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So unfortunately the unit isn't actually going into demo mode or else the display would show OF OF on it. It is however acting up because the unit is warming up and it's not supposed to. You're not getting an error code if it's flashing -2 because the flashing -2 means that you have the temperature set to -2 but it's not reading the proper temperature. That could be a bad control board or an issue with your sealed system like an inefficient compressor or a sealed system freon leak. You'd need to remove the back panel inside your freezer after you have unplugged the unit and plugged it back in and let it run for 30 minutes or so. If the silver coils behind the back panel inside the freezer are lightly frosted from top to bottom then you need a new control board. If it's only partially frosted, you'd need a technician to come out and check the freon pressure.
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The board itself is all plug and play and located on the back of your refrigerator behind an access panel. Below is a link to the control board for your model.
CLICK HERE for control board
It could have melted in the 10 minutes since they just get a light frost when working properly.
There is actually only 1 compressor on this model but yes if both the refrigerator and freezer portion were being affected then it sounds like the control board is your issue.
ok good luck
I already know what model you have because you gave me the model number before so nothing changes.