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Hi, welcome to Just Answer. My name is ***** ***** I look forward to helping you! The heavy frost is causing the lack of air flow into the refrigerator. The frost will thaw easily by opening the doors and unplugging the appliance for 24 hours. After thawing, cooling will be restored. However, there is likely a faulty component in the defrost circuit. Do you have a meter to test with?
Is the frost in one small area and heavy or all across the coils?
If it is heavy frosting in one hour, there has to be an air leak that is causing the frost. How are the door gaskets?
Yes, but it should not frost up within an hour.
Is the fan running in the refrigerator?
Well, if the fan is running and the coil is frosting, it has to be an air flow issue caused by lack of air flow somewhere. Is the frost on the coil enough to prohibit air from flowing across it?
The fan will run when the door is shut and compressor is on.
That frost is normal, is the fan running?
And it still will not go below 45* F, even with the fan running and the coil cold?
If you are certain there is no other air blockage in the ducts, then you likely have a sensor that is shutting the cooling off prematurely. Does the display show the correct temperature?