Why won't my gas fire pit stay lit?
A gas fire pit that lights then dies almost always has a thermocouple problem or a starving gas supply. On pits with a safety pilot, the thermocouple must sense flame to keep the valve open — if it's dirty, misaligned, or failing, the valve shuts within seconds. On propane pits, a tripped regulator or a low, cold tank does the same thing.
The flame-sensing safety
A gas fire pit that lights and then dies a few seconds later almost always has a flame-sensing safety doing exactly what it's built to do — shutting the gas off the instant it stops sensing a lit flame. On a pit with a standing pilot, the culprit is the thermocouple: a thin metal probe sitting in the pilot flame that generates a tiny electric signal telling the valve 'flame is present, keep the gas on.'
If its tip is sooted over, bent slightly out of the flame, or simply wearing out, the signal drops, the valve reads 'no flame,' and it closes. It's the same part and the same failure we replace on indoor gas fireplaces every week — outdoors it just corrodes and fouls faster.
Propane's own tricks
Out in Fairview, Candler, Brevard, and the cabins where everything runs on propane, the fuel itself causes stay-lit problems. Open the tank valve too fast and the safety regulator trips into a bypass mode that only trickles gas — the pit lights small and then starves out. The fix is to shut everything off, open the tank valve slowly, and relight.
A low tank does the same thing, and on a cold mountain night a nearly empty tank can't vaporize propane fast enough to feed a hungry burner, so the flame shrinks and dies even though there's liquid sloshing inside. If the tank frosts over while it runs, that's your sign.
Wind, glass, and getting it checked
Wind is the other everyday cause — a gust across the pilot or sensor cools it enough to drop the flame, and piling fire glass or lava rock over the pilot and thermocouple smothers the very flame the safety needs to feel. Keep the media clear of the pilot assembly.
If you've ruled out the tank and the wind and it still won't hold, the thermocouple or valve needs service. We install and repair gas fire pits across Western North Carolina and can test the whole safety circuit properly. Call (828) 545-0525.
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