Update by user Jul 21, 2018 American Standard did reach out to me and started the problem was with Honeywell not them. Original review posted by user Jun 21, 2018 I've had 2 service calls on my 5 ton American Standard AC unit for exactly the same problem. The unit is 6 years old that quits when an internal wire connection of the Honeywell Zone Board vibrates loose from a spring-loaded connection. The Honeywell Zone Board is attached to the Am. Standard Air Handler and has a protective cover (on the board) so that nothing can disrupt the function. There is absolutely no reason I should be worried about a wire coming loose and shutting-down the system. I live in Florida and when your AC quits in summer heat and humidity you have the possibility of damage. in my case all my wood floors warped because we were away for more than a week. Have tried, to no avail, to contact engineering at Am. Standard Air to explain the problem but unless I'm a technician they refuse to discuss it. BTW; the installer refuses to handle the problem beyond a $94 service call, each time, to reconnect the wire in the Zone Board.