does the microwave have power? I tripped the breaker in my house yesterday and everything worked except the micro, tv, fridge. No breakers in the camper tripped, nor did any fuses blow. Lights, fans and radio continued to worked fine, as it automatically flipped over to battery power, with the exception of the fridge, which tried to switch to propane, but it wasn't on, so it just shut off. After you reset the breaker (in your house) that tripped, reset the GFI in your camper bathroom. Everything should work then.
Same thing happened to me when I tried to run the elec water heater at the same time I ran the air conditioner. Lesson learned. Let me know if this helps.
2014 Rockwood Roo 23IKSS
2012 Dodge Ram 1500 Hemi 4X4
Me, Hubby and Luna the Lab