anyone ever work with this junk, pros cons , we got a new account with it, went there today and and found one system with a cool 2 fail, after checking unit observed the discharge sensor on control reading 72 and the return sensor reading 47 f, hmmmm looked up above ceiling tiles and sure as sh** the sensors were backwards, what would trip this alarm, obviously controller was probably looking at the discharge sensor never coming down in temp with 2 stages running because of it being in the return , but i didn't notice any alarm circuits or communitacating cables to the rtu ?