If the pilot won t stay lit on your gas fireplace it s probably time to replace the thermocouple.
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If your pilot light stays lit for a few moments but continues to go out after relighting it may very well need the thermocouple replaced.
I have a heat n glo vented gas fireplace.
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Replace it with an identical one.
Replacing the thermocouple is quick and something you can easily do yourself.
You should test it first.
A gas fireplace thermocouple is a safety device that measures heat and recognizes if a pilot light has gone out shutting down the fuel supply such as gas or propane.