The pilot lights, holds a minute, then quits again

"It lights, I let go of the knob, and it goes out." That is the most common sentence we hear on gas fireplace calls, and it usually points to the small sensor sitting in the pilot flame. On older units this is a thermocouple; on millivolt fireplaces it is a thermopile, which does the same job with a little more output. Either way, the part turns heat into a tiny electrical signal, and the gas valve only stays open while that signal is strong enough. Soot on the tip, a pilot flame that has shrunk or drifted sideways, or a sensor that has simply worn out after years of heating and cooling will all drop the signal below what the valve needs. The valve then shuts, on purpose, because it cannot tell whether a flame is there. We read the output with a meter at the valve, clean the pilot hood and orifice, and only replace the sensor if the numbers say it is weak. Guessing at parts is how a repair turns into three visits.

Not every failure sits at the pilot. A fireplace that clicks and never lights may have a cracked igniter, a spark wire rubbing on the firebox, or a pilot orifice blocked by a spider web, which happens more than you would think in homes where the unit sits unused through a warm Pacific Palisades summer. A unit that lights the pilot but will not bring up the main burner often has a wall switch, remote receiver or wire connection fault, and sometimes the receiver batteries are the whole story. Yellow, lazy flames that leave a grey film on the glass tell a different tale: logs shifted into the burner path, ports clogged with lint, or a unit short of combustion air. A unit that runs for ten or twenty minutes and then shuts itself down can be tripping a spill switch because exhaust is backing up. Each of these looks similar from the sofa. We check them in order, show you which one it was, and give you a written price once the part is known.

Start with the safety part, because it matters more than any repair. If you smell gas, the rotten egg odour added to natural gas so leaks can be noticed, do not try to find the source and do not switch lights, appliances or the fireplace on or off. Leave the house with everyone in it, then call your gas utility from outside, and call us once they have cleared the house. Carbon monoxide is different: it has no smell at all. Warning signs are a headache that eases when you step outside, drowsiness, nausea or dizziness, especially if several people feel it at once while the fireplace is running. If that happens, turn the unit off, get everyone into fresh air and call 911. A working CO alarm on each floor, and one near the room with the fireplace, is cheap protection. A gas fireplace that is sooting the glass, burning yellow or shutting off on its own should stay off until someone has measured what it is putting into the room.

On a repair visit we take carbon monoxide readings at the unit and in the room before touching anything, then again after the fix, so you can see both numbers. Direct-vent units pull outside air in and push exhaust out through a pipe within a pipe, and that pipe can be crushed, separated or capped by a bird nest. B-vent and older units rely on the flue drawing, so a cold or blocked chimney turns into spillage. Along the coast in Malibu and Santa Monica, salt air rusts termination caps and burner pans faster than inland. In Pacific Palisades, homes rebuilt after the January 2025 fire sometimes have new rooflines that sit close to an old vent termination, and wind across the new roof can push exhaust back toward the intake. Brentwood and Beverly Hills houses often run gas units alongside wood fireplaces on the same stack. Gas units are also the way to keep a fire on South Coast AQMD no-burn days. To book, use the call button on this page and tell us exactly what the flame does.