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I hope you learn some thing from this post about the ptc compressor staring relay and its working however i will guide you about all types of ptc relays and its wiring methods with complete diagrams. In many ptc compressor relay have a connection point for run capacitor and we connect the run capacitor in parallel with relay which help in better staring and running compressor however i will guide you about all types of ptc relays and its wiring methods with complete diagrams posted by muly stk at 615 am email this blogthis. Capacitor start capacitor run compressor ptc relay wiring diagram habib ullah 819 am this post is about the capacitor start capacitor run compressor ptc relay wiring diagr. How to test a refrigerator ptc relay if your refrigerator stops producing cold air there may be something wrong with the ptc positive temperature coefficient relay also known as the start relay the ptc relay starts the compressor. I found that the relay on the side of the compressor was burnt and confirmation from finding the wiring diagram behind the front grill this is how it was before the event i have been unable to determine definitely whether the ptc relay is compatible it has 3 male terminal connections instead of the 2 found on the original