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The pilot will not stay lit
Commonly the thermocouple or thermopile, sometimes the pilot assembly itself. Both are serviceable parts.
Gas fireplace repair · Flower Mound, TX
Gas Fireplace Repair in Flower Mound, TX
A great many Flower Mound homes have a sealed direct-vent gas unit that vents through an exterior wall and has no chimney at all. Homeowners often assume that means nothing to service. It does not.
The glass front on a direct-vent unit is part of the seal rather than a screen over the fire. Its gasket hardens and loses compression on a schedule regardless of how often the unit is lit, and the exterior termination sits low enough to attract birds and wasps. Both are quick checks that almost never get done.
Flower Mound office on Long Prairie RdSame-week availabilityInsured & bonded1-year written guarantee
Overview
A sealed system, not an open fire
Most gas fireplaces in homes of this era are direct-vent: they draw combustion air from outside and send exhaust back outside through a coaxial pipe in the wall. Nothing is taken from the room and nothing is meant to enter it.
The glass front is part of that seal rather than a screen in front of a fire. It is held against a gasket, and the gasket is what keeps the sealed side sealed.
Why it matters
Why the two ends matter most
The seal at the glass and the termination outside are the two safety-critical points on a direct-vent unit, and both are routinely overlooked. A cracked pane, a hardened gasket or glass reseated incorrectly after a cleaning all break the separation the appliance depends on.
The termination is the other end of the same system. It sits on an exterior wall, often within reach, and it is engineered around unobstructed flow. A nest or debris in a coaxial termination restricts exhaust on an appliance that has no margin for it.
What to look for
Signs worth acting on in Flower Mound, TX
It ignites late, or with a noise
A delay before ignition is worth attention rather than repetition.
Lazy, yellow or uneven flames
The flame pattern is the clearest read on how the unit is burning. A change in it is a change in combustion.
Heavy film on the inside of the glass
Beyond the normal seasonal haze, this can indicate the unit is not burning as cleanly as it should.
The glass rattles or the gasket looks flattened
The seal is doing less than it should, and on a sealed unit that is a safety item.
A blocked or obstructed termination outside
Nests and debris in the coaxial vent. Quick to check and almost never checked.
Included
What the service includes
Pilot and thermocouple
Pilots that will not hold, weak thermopiles and dirty pilot assemblies diagnosed and repaired.
Gas valve and ignition
Failed valves, control modules and electronic ignition faults traced and replaced.
Glass and gasket seal
Gasket compression checked and replaced, which on a sealed unit is a safety item rather than a cosmetic one.
Venting and termination
Exterior terminations checked for obstruction, corrosion and nesting.
Log set and burner
Burners cleaned and adjusted for even flame, log sets repositioned or replaced.
How it works
What we actually do on the visit
We check the seal first
Glass, gasket and seating, because that is the item with the smallest margin for error.
We service the burner assembly
Pilot, thermocouple or thermopile, orifices and the burner itself cleaned and tested.
We test the gas valve and controls
Ignition, modulation where fitted, and the safety shut-off operating as intended.
We inspect the termination
Outside, for obstruction, clearance and condition, then clear it if it needs clearing.
We run it and watch it
A gas unit is judged running. The flame pattern after service is the test that matters.
What to expect
What the visit looks like
Most gas work is completed in a single visit. Common parts such as thermocouples are carried; anything model-specific is ordered against the data plate.
If we find something that makes the unit unsafe to run, we will tell you and we will not leave it in service. That is rare, and it is the reason the annual check exists.
Looking after it
Between services
Have it serviced annually whatever its age. Gas appliances need it because of use, not because of years, and a five-year-old unit is not exempt.
Keep the exterior termination clear, and look at it in spring when nesting starts.
Leave the glass to a technician. Removing and refitting it disturbs the gasket, and the gasket is the seal.
Flower Mound FAQ
Common questions in Flower Mound, TX
Straight answers from the work we do here, not general advice copied from a manual.
We have a gas fireplace with no chimney. Do you service that?+
Yes. That is a direct-vent sealed system and it needs annual service. We check the burner, valve, pilot and thermocouple, the glass and gasket seal, and the exterior termination.
The pilot keeps going out. Is that serious?+
It is usually a weak thermocouple or thermopile, which is a straightforward repair. It is worth doing properly rather than relighting it all season.
Our gas fireplace has no chimney. Does it still need servicing?+
Yes, and arguably more. A sealed direct-vent unit depends on its glass seal and an unobstructed exterior termination, and both are safety items that nothing else checks.
The unit is only a few years old. Surely it is fine?+
Age is not what determines it. Gaskets compress, burners collect debris and terminations get blocked through use, so a newer unit needs the same annual attention as an older one.
I can smell gas near the fireplace. What should I do?+
Do not try to diagnose it. Turn off the gas supply if you can do so safely, leave the property, and call your gas utility or the emergency number on your meter. Ring us afterwards, once it is safe.
What is the difference between a thermocouple and a thermopile?+
Both are safety devices that sense whether the pilot is lit, and both are common causes of a pilot that will not stay on. A thermocouple is the simpler of the two; a thermopile generates enough current to run the valve and controls. Which one you have depends on the unit.
Do you work on gas logs in an open masonry fireplace?+
Yes. That is a different system from a sealed direct-vent unit, and it is inspected differently, with the chimney and damper as part of the assessment rather than a glass seal.
More in Flower Mound, TX
Other Flower Mound services
Chimney Cleaning
Full flue, smoke chamber and firebox swept with HEPA containment throughout.
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Chase covers, crowns, flashing and masonry, fabricated to fit your chimney.
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A written condition report on the firebox, venting and clearances.
Read moreFireplace Repair
Refractory panels, gaskets and firebox components replaced to spec.
Read moreFireplace Cleaning
Firebox, grate, damper and glass brought back and checked.
Read moreFireplace Maintenance
The annual visit that keeps repairs small and the season trouble-free.
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