It does doesn't it. Must sense methane or something. Spray propellants can set them off also. It can be somewhat of a pain to determine the source, or the detectors at its end of life. Either way it seems to always happen in the wee hours. At least ours does.
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Think you're too old to cry or swear out loud...walk into your hitch in the dark.
2012 Jay Flight 19RD
2016 Ford F150 XLT 2X4 SC 3.5L Eco Max Tow
2010 Tundra TRD DBL Cab (Traded)
2 new fluffy Corgis, Bayley and Stanley
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