The a/c doesn't come on when it is called for by thermostat. The inside unit comes on but no outside air conditioner. This problem was resolved the same day we were called. Everything inside the a/c melted. We repaired the wires and replaced this stuff. It was not cheap, but it is way better than buying a new one. No high pressure sale here. If you have a leaking system and this happens you should replace it since it has 2 major issues. This one holds refrigerant well so repair was a great option. Locust Grove we are here 7 days a week.