Why does my gas fireplace's main burner light and then go out after a few seconds?
For Hendersonville homes, the culprit is almost always a weak thermopile letting the gas valve close a few seconds after the burner lights. In this retirement-heavy town we see a lot of quiet, low-maintenance sealed gas units that get leaned on hard all winter, and the sensor, pilot, or valve eventually can't hold the millivolts.
Built for people who depend on the flame
Many of our Hendersonville customers chose a sealed gas fireplace precisely because it's quiet and low-maintenance — flip a switch, get heat, no wood to haul. That also means the pilot and thermopile run long hours through the cool valley evenings without anyone watching them. When a thermopile that has carried the load for years finally under-produces, the valve does its job and shuts the burner down. It's rarely a big failure; more often a tired sensor, a pilot gone lazy over summer, or a loose spade connector.
The clay-soil wrinkle around Laurel Park and Main Street
Henderson County's heavy clay settles foundations and slowly stresses older masonry chimneys, and on a masonry gas-log setup a shifting firebox or a downdraft off a cracked flue can nudge the pilot flame off the thermopile tip — so it stops getting the heat it needs. We check pilot placement and flame quality, not just the electrical reading, before deciding what to replace.
How the diagnosis goes
We pull Henderson County permits on the gas side when work calls for it, clean the pilot, and meter the thermopile open-circuit and under load. The thermopile is an inexpensive part and usually a one-visit fix; a valve costs more, and we'll tell you honestly which you're facing first. Call (828) 545-0525 — we're 25 minutes south.
Fireplace help in Hendersonville
We install and service fireplaces throughout Hendersonville and the rest of Henderson County — just 25 minutes south from our Asheville-area showroom.
Related questions
- My gas fireplace pilot is lit but the main burner won't come on — what's wrong?
- What is a thermopile and how do I test it with a multimeter?
- Why does my gas fireplace pilot light keep going out?
- Why does my gas fireplace shut off by itself after a few minutes?
- Can spiders or insects clog a gas fireplace pilot?