Breaker Panel Help Please

westernrvparkowner, I agree that it would be strange for all the breakers to trip at the same time. I can't answer your question though other than to say that I know the electric element worked prior to my last camping trip. When we arrived at the campground and I hooked up power, it didn't. Initially, I assumed the element was bad and I used Propane over the weekend and didn't do any troubleshooting. When I got home, checking the breakers should have been the first thing I did but assuming it was the element, I emptied the water tank, removed the element, did an ohms test on it and it was fine. Then I removed the switch and did the same test. That tested ok as well. So with the element out and just bare connections, I tested voltage and had no power. That's when I checked the breakers and discovered they were off. I gave no thought whether they were just off or had tripped. When I turned on the water heater breaker, everything tested ok but it got me to wondering why they were off in the first place, what the labels said and why there were two AC breakers when I only have one AC unit, and why one breaker has no label at all. I assume there's a breaker for a washing machine wired up in case I add one at some point in the future.

DutchmenSport, I'm going to do what you suggest later today. I want to know what that unlabeled breaker is for at the very least and if the AC works with one breaker on and the other one off (like one is for the installed AC unit and the other is wired in case I add a second unit).