The propane alarm keeps sounding. I don't smell any leaks. I turned off the tanks at the valves. I checked that the stove, frig and hot water heater aren't getting any gas. I opened all the windows and the door and aired the trailer out. Finaaly had to turn off the battery power and disconnect the shore power. It was really windy for a few days and dusty, could that cause this? Just replaced the carbon mooxide alarm because it was past it's "expiration' date and wouldn't shut off. Do the propane alrms have a limited life also.?