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Gas fireplace with powerpile, and thermocouple

zepfan Member Posts: 342
I was replacing a pilot assembly on an LP gas fireplace, that has both a powerpile, and a thermocouple that attach to the gas valve. I was wondering what is the purpose of the thermocouple, if the pilot assembly already has a powerpile? I am used to see one, or the other but not both There is no external power supply for the fireplace, the pilot assembly does it all. Any suggestions or insight would be much appreciated. thanks to all.