OMG, you are going to die from CO poisoning, just before your coach blows up. Better call Bob Tiffin ASAP his morning, and drive to Red Bay if you are not dead or on fire.
Now that we have the worse case hysterics that seem to pop up on forums out of the way.........
It seems they alarms can go off for many reasons other than what they are supposed to go off for. It was the first of just a handful of minor issues we have had on our new 2015 31sa....
So, double check for propane leaks just to be sure. Seems doubtful you have a CO issue unless you were running your furnace and it has a problem.
They seem to go off with low voltage situations, and it appears other things like aerosols, animals, hair, dust, and I also think off gassing from new interiors too. Maybe even gasses from your batteries (probably worth a sniff there too). And maybe there was just a bad batch that Tiffin got because there have been a handful of similar situations on forums with other 2015 Allegros too (hence some of my sarcasm at the beginning).
Ours was going off twice in our storage place between our first trip and 2nd, and we were plugged into a shared 20amp outlet which we have since determined gets tripped on occasion.
It then went off again on the 2nd trip at 2 am of course (was actually very happy at that point that we knew what it was from the previous issues in storage), and it was a pita to reset that time, I had to get my tools out of the basement, pull it out of the wall and take it apart to get the reset button to work.
Called Tifin, and they sent a new one ahead to our next campground. I did not install it right away, but was prepared - had screwdriver, wire cutters on the dresser, and had bought spades / plugs to use too so it would be easy to remove if necessary going forward. Off against 2 am, screwdriver in hand, wire cutters, and it was yanked out in a minute. Installed the new one next morning, and not a false alarm since......