Need Appliance Repair Help? Ask a Technician for Answers ASAP
If you heard the unit running and it was warming up, then you don't have a thermostat issue or a defrost control issue. If either of those were bad, the refrigerator would have been 100% silent when it was warming up. Now I know it's quite now so maybe it's in the middle of defrost or something like that but if so then it should kick back on in an hour or so.
As for the unit warming up while running, that means you have an issue with your compressor itself. Pull the refrigerator forward and unplug the refrigerator. Remove the lower back access panel and locate your large black round compressor. There is a small plastic box attached to the side of the compressor with several wires going into it. This is your overload relay. Pull the overload relay off the compressor and shake it. If it rattles, then it needs to be replaced. If it doesn't rattle, then you likely have a bad compressor and you'll need to call a technician in order to replace the compressor.
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