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I'm troubleshooting a gas (propane) fireplace. The pilot won't stay lit (after I ignite it with piezo start and let it burn 30-60 secs. I pulled the unit out to have a better look, and then decided to try again to light the pilot - this time it worked.

Here is a picture of the pilot assembly, from the manual ...

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... and here is a photo of a replacement pilot assembly (the exact correct part #) ...

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Why does this thing have a thermopile AND a thermocouple ? I thought they did the same thing: detect a lit pilot flame and allow a valve to continue providing gas to the pilot. The "thermopile" seems to connect with two wires, as I expect, as it provides a signal of some millivolts to enable gas flow. The "thermocouple" seems to connect with a small gas line of some kind. What's the deal here ?

RustyShackleford
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    Please revise your post title to ask a clear, _specific_ question. If you find that difficult it may be because you're asking too much in one post. – isherwood Nov 14 '22 at 15:13
  • Q2 would likely get closed if on its own as an opinion based question. – FreeMan Nov 14 '22 at 16:42
  • Ok, edited it to just the first question. Not sure why though ... why clutter up the site with 3 questions, when they are closely-related, and a person who knows the answer to one probably knows the answer to all three. – RustyShackleford Nov 14 '22 at 17:47
  • Are you sure one of your sensors isn't a CO (carbon monoxide) sensor? I think all recent gas fireplaces & log sets are required to have one. It's to shut down the fireplace if the CO level gets too high. – SteveSh Nov 14 '22 at 18:07
  • Pretty sure. They are labeled thermopile and thermocouple in that drawing. BTW, the house has two CO detectors, as well as a plethora of smoke detectors. – RustyShackleford Nov 14 '22 at 18:59

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