You need to sort out the problem a little bit.
One, when on generator is 120ac available in the coach everwhere it should be? Are you seeing amperage on the EMS system?
Two, try the air conditioner on shore power if it is possible.
Three, check the breakers on the generator to be sure they are on.
Give me some feedback and I'll try to work you through the process.
I'll be watching the forum for your response.
2007 Tiffin Phaeton MBE,US Gear tow brake
Master Certified RVIA Tech
Ford Ranger toad (worktruck)