I have the 2010 TrailMini 18L and my detector was just above the floor in the bathroom wall perpendicular to the heater in the sofa. Mine did the constant beeping/alarming while stored, didn't matter if battery was connected and trailer plugged into shore power or not. I got a brand new one from my dealer and it still did it. Safe-T-Alert was no help at all on troubleshooting and wanted me to pay to ship it back to them. We empty/clean out the tanks/toilet/trailer after every trip, air it out, close the valves at the propane tanks and there are no appliances in this garage. The garage is detached and is about 8 feet away from my neighbor's bedroom window so I needed to fix it. I removed the detector and bought the plug-in CO/hazardous gas detector from Kidde for when the trailer is in use. This also allows me to place it somewhere other than right next to the heater since these detectors aren't supposed to be placed in a drafty spot anyway.
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