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Easy to tell if it has one...tip it over while its lit.shuts off when tipped there is one.
If it lights sometimes its not stuck closed.if it lights put it on its side and if it shuts off it has a tipover switch.ive never had a mr heater that the switch stuck open.if it was it fire up great.mr heater co recommended rapping it with your hand a few times if you think its stuck.not kidding either.lol ive had so many buddy heater problems lighting over the years.