Have you checked the manufacturer's web site? Who's is it? The big 3 in LP detection are Atwood Mobile Products, CCI controls, and Safe-T-Alert.
Also, see if they put the owner's manual in your cute little brief case. If not and you can't find anything on line, let me know and I'll try to dig up some phone numbers for you.
Solar Tech Energy Systems, Inc.
Victron Solar Components and Inverters, Zamp Solar Panels, LiFeBlue and Battle Born Lithium Batteries, Lifeline AGM Batteries