Product review (5 stars): BEFORE YOU GO OFF AND BUY A NEW REFRIGERATOR ...
This is a very easy thing to check.  Make sure appliance is unplugged first.  Remove wires and unplug the OEM start device from the compressor body (may need to use a screwdriver to assist).  I sniffed the old part and could tell it was burned.  Tearing the old part open confirmed this. The new start device kit contains replacement plug in boxes for refrigerators that can use them, and otherwise separate parts which are plugged in to the compressor to make the same function.  Mine was the latter.  Instructions are easy to follow.  Replace the wires after you plug in the replacement hardware (you may not be able to get the black box provided to fit over the separate pieces and wires).  Before re-installing the cardboard back-side cover and plugging the unit back in ... make sure to really clean the coils.  I had to tip my refrigerator over (2 person job) to do a good job.  DO a good job or you may be replacing the compressor next time.