Built in Propane Heater thermostat not functioning

Well that may very well be the case, perhaps it's been kinked a bit at some point. I've been careful with it, but maybe it's got a tight bend in it that it doesn't like. I'll take a better look at it sometime this weekend.

And it makes sense as well as it took an awful lot of heat to have it kick off, and it also took a very long cool-down time to turn back on. Time to dig out a magnifying glass .....