Ken's reply was on to something: you need to tell us if the GenSet is powering other equipment in the RV. If not, Ken is right --> go find the breakers on the GenSet.
But if the GenSet is powering things like TV and microwave, then here is a thought: My roof-mount AC units do not come on immediately when I set them to come on. The temp control unit waits about 60 seconds before the AC begins to blow (this is true when the AC "fan" is set to "auto"). So maybe you're OK....but you just need to wait for this time-out. Best of luck!!
Robi, Dale, and "The Duchess" (lap kitty)
2004 Monaco Diplomat 40' PST
Tow: '08 Buick Lucerne