Just got our Brand New Road Warrior and the built in Dirt Devil will NOT shut off any help would be appreciated.
Our 300C had this issue recently, too. We had a lot of people in our trailer, and someone was sitting on the steps above the inside connection. He may have tapped it with his heel and it kicked on. I ended up turning it off with the breaker. I later pulled out the inside connection, disconnected one of the wires on the switch, and it still operated when I turned on the breaker. I did the same thing with the basement connection. I figured it was something with the vacuum itself, which is not easily accessible. After our last trip, I used the vacuum to clean the floor, using the breaker to turn it on. When I was done, I removed the hose and the vacuum stopped. So now it appear to be working ok. I'm a but stumped. It acts like something was amiss with the internal hose connection, but I thought I ruled that out.
So, try inserting the hose, and removing it. Also note that if you slide up the hose door, it will turn on the vacuum so you can sweep debris in to the small opening at the bottom. Maybe your door is in this position?
-steve