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The start relay should be on the side of the compressor and attached to the three prongs that wiring attaches to on the compressor.Is the problem causing the breaker to trip in the circuit breaker box? Sea Breeze You can have someone match the start relay and the run capacitor at a refrigeration supply store near you or you can contact Summit HERE http://summitappliance.com/support
I would look to see if it is tripping during the defrost cycle. One of the heater elements my be faulty. Never heard of a bad TXV causing a breaker tripping, but I guess it's possible. I would adjust the superheat so that it is about 6 to 8 degrees just prior to unit reaching temp and shutting off. I'd start there.
If it runs, turns off, then tries to restart and kicks breaker, look for bad start components. Check start relay, start capacitor. It may be trying to restart too quickly and the compressor over amps and breaker trips. The system needs to have at least 3 minutes of off time before trying to restart. This allows the pressures in the system to balance enough so the compressor can overcome the high side pressure and start. I've seen where people turn the control up and down very quickly causing the compressor to over amp and trip breakers and over loads.
Hope this gets it for you.
Most likely a short in the compressor electrical components (relay, overload,capacitor) Supco makes a 3 in 1 that you could use. If this works fine, if not "bad compressor".
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