After 2 nationwide service companies told me I had to replace my entire 6 yr old system. One estimate was $10,000 the other $18,000. Called Air Depot, told problem to Joe Watkins, he sent Oscar the next day to replace the controller. He did so and checked out the complete system and found no problems with other components. A/C continues working fine. Total to replace controller was less than $1,000. Much better than first two estimates. I recommend Air Depot and Oscar highly.