Cooling problems do not always mean the PTC starter has failed. Dirty coils, poor airflow, a bad fan, or a damaged compressor can cause similar trouble. Test the starter and nearby parts before ordering a replacement. Confirm fit with the complete appliance model number and exact terminal layout. Disconnect power and move the refrigerator...Read more away from the wall carefully. Keep wires in their correct places, replace damaged connectors, and use professional service if the compressor still will not start.