I agree with Crow, if you have a slow leak then turning off the propane at the tank and airing out would stop the alarm. Even with the propane off the lines would still be pressurized and continue to leak which would lead to the alarm later. Check all accessible connections for leaks with a soap test. If you can't find and fix it then I guess you'll have to take it to a dealer. To rule out the battery turn on the propane but disconnect the battery so that it can't charge from any source. Make sure to disconnect the battery first in case it sparks.