I have a freestanding Kingsman naturatl gas heater/stove. It looks just like a wood stove, but uses natural gas.
I was advised to use a stiff wire to clean out the pilot orifice - and considering it appears to be made of very sturdy metal, it might be okay. Yes, I've cleaned out the pilot orifice as well as the burners to the heating unit. The pilot itself, when lit, is a steady blue flame with hints of orange at the tips, so appears to be a good flow of gas and a clean pilot orifice.
The pilot does stay lit for as long as I don't switch it to turn on the heating unit. Once I flip that switch it is either a minute or up to fifteen minutes before it then all shuts down, including the pilot light. ...shrug... The research I've done (and which led me to this forum) says that it might be the thermocouple. So that is my beginning point, but I have to order that from Canada apparently. I have yet to find a US distributor for Kingsman. ?? Maybe someone in this forum knows of one?
I was not sure if I would be wise to replace the thermopile, too, tho. This is where my original question came in as to what the differences were. IF I am going to order the one...I might as well order the other, and may be that would be wise all around even just to have spare parts on hand.
I guess it's Murphy's Law that these types of things only happen once the temperature drops outside and you actually *need* the stove's heat. ...chuckle...