I have a Heart Interface Freedon 15 in my ...

I have a Heart Interface Freedon 15 in my 98 Monaco. The unit seems to stop working randomly and i get no power to my a/c plugs inside of the motor home. does this sound like a circuit board or fuse? it will reset after some time by itself. Almost like a loose connection.. No regularity to it. I can actually go to the unit that is mounted underneath and hear it humming when it is working. There is no sound when it is not. The pop out breaker seem to be o.k. The batteries are being charged so it appears the problem is on the a/c side. Does anyone have any experience with this?