The propane used in a Coleman lantern should activate the propane detector in your camper if there was enough concentration. If the gas slowly leaked out, then the concentration may not have been enough to set the detector off, meaning there was never enough concentration for the propane to ignite.
Try this: Light a butane lighter, blow out the flame but keep the button pushed down. Put that directly in front of the propane detector. The detector should go off within 30 seconds or so. If not, then it is probably time to replace the detector.
I see where you have a 2012 model, so it might be a warranty item.....many appliances carry a warranty longer than the camper warranty.
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Chap , DW Joy, and Fur Baby Sango
2017 F350 Lariat CCSB, SRW, 4x4, 6.7 PS
2017 Grand Design Reflection 337RLS
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