If you are talking about the LP detector in the bedroom, I do not believe it has the ability to shut off LP flow, only sound an alarm that you have loose LP inside. As far as the house batteries, what if anything is running during the 24 hours? What position is the use/store switch? There are parasitic electrical draws, as long as the batteries are connected, so you might want to measure current flow going out of the batteries. If there is zero draw and they just go dead in 24 hours, sounds like the batteries are toast. Our Gemini is the one model that is on the Mercedes chassis, and in a year, we have had zero problems with anything drivetrain or chassis related, other then with driving, the oil got dirty and had to be changed. As far as LP flow, I would first look at the regulator valve, they have been known to go bad and restrict or stop LP flow.