Gas Fireplace Pilot Light Won't Stay Lit? Here's What That Usually Means

A pilot light that won't stay lit is one of the most common gas fireplace calls we get — and the good news is it's usually one of a few fixable issues, not a sign the whole unit is failing.

1. A failing thermocouple or thermopile

This small sensor tells the gas valve the pilot is lit. Once it weakens, the valve shuts gas off even though the pilot is burning fine. It's a straightforward, inexpensive part to replace.

2. A draft pulling the flame sideways

If the pilot flame doesn't fully contact the thermocouple because it's being pulled by a draft, the sensor reads "out" and cuts gas. Sometimes this is fixed by cleaning, sometimes by adjusting the pilot assembly itself.

3. A dirty pilot orifice

Dust and debris can partially clog the tiny pilot opening over time, weakening the flame until it's no longer strong enough to keep the safety sensor satisfied.

What not to do

Repeatedly trying to relight it without diagnosing why it's going out just wastes gas and time — and on older units, forcing parts that are already failing can make a simple fix into an expensive one.