By Paul Herman, Owner, Sweeps N Ladders
A lot of folks in North Texas pick a gas fireplace because it’s easy. There’s no wood to haul and no ashes to scoop. You just turn a key or press a button. Most of the year that holds true. Then the first cold front comes through, you go to turn it on, and nothing happens. Or it lights and then quits. Or it runs all evening and the room never warms up.
Gas fireplaces are simpler than a furnace, but they still have parts that wear out, get dirty, and drift out of adjustment. That’s especially true after they sit unused through a long Texas summer. Below are the problems we see most often on service calls around Dallas and Collin County, what usually causes each one, and what’s safe to check yourself before you call.
The Pilot Won’t Stay Lit
This is the call we get most. You hold the knob down, the pilot lights, and the moment you let go it goes out.
Most gas fireplaces with a standing pilot use a small safety part called a thermocouple. It sits right in the pilot flame. When it gets hot, it makes a tiny bit of electricity that tells the gas valve it’s safe to stay open. If the pilot goes out, the thermocouple cools down and the valve shuts off the gas. That’s a good thing. It’s the reason a gas fireplace doesn’t keep pouring gas into your living room when the flame is gone.
The trouble is that thermocouples wear out over the years. When one gets weak, it can’t hold the valve open, so the pilot drops out every time you let go of the knob. Many fireplaces also have a second, larger part called a thermopile that powers the wall switch or remote. A tired thermopile is the usual reason a pilot stays lit but the main burner won’t come on.
The other common causes are simpler. The pilot opening can get partly blocked by dust, rust flakes, or spider webs over the summer. That makes the flame small and weak, and it doesn’t wrap around the thermocouple the way it should. A strong draft from the flue or a nearby vent can also push the flame away from the sensor.
Here’s what’s safe to try yourself. Make sure the gas valve to the fireplace is fully open. Follow the lighting steps printed on the label inside your fireplace, and hold the knob down for the full time the label says before you let go. If the pilot still won’t stay lit, stop there. Don’t keep relighting it over and over, and don’t try to bypass or adjust the safety parts. That’s the point to call us.
The Burner Runs, but the Room Stays Cold
Sometimes the fireplace lights fine and the flames look okay, but you can sit right in front of it and barely feel any warmth. There are a few usual reasons.
The first is a dirty burner. The burner has rows of small holes where the gas comes out. Over time those holes clog with dust, soot, and bits of the log set. When some are blocked, you get a smaller, lazier flame that puts out less heat. You may also see more yellow flame and black soot on the logs or glass.
The second is gas pressure. If the pressure coming into the fireplace is too low, the flame will be short and weak no matter how clean the burner is. Checking and setting that pressure takes a gauge and some training, so it’s not a homeowner job.
The third is the blower. Many gas inserts and built-in units have a fan that pushes warm air out into the room. If the fan has quit, or it’s packed with dust and pet hair, most of that heat stays inside the box instead of reaching you. A blower that hums, rattles, or doesn’t come on at all is worth having looked at.
The fourth is the glass. A cloudy, sooty glass front blocks a lot of the heat you’d normally feel. Cleaning it the right way, with a cleaner made for fireplace glass and only when the unit is completely cool, can make a real difference.
One more thing worth knowing: some gas logs are made mostly for looks. A decorative vented log set in an open fireplace sends most of its heat up the chimney. If you’ve always felt like your fireplace doesn’t do much, it may be working exactly as built. In that case, an insert designed for heating may be the better answer, and we’re happy to talk through the options.
If You Smell Gas, Do This First
Natural gas has no smell of its own. The gas company adds a sharp smell, a lot like rotten eggs, so you’ll notice a leak right away. Take that smell seriously every time.
If you smell gas near your fireplace or anywhere in the house, leave right away. Get everyone, including pets, outside and away from the house. On your way out, don’t flip any light switches on or off, don’t use the fireplace remote or wall switch, don’t light anything, and don’t start a car in an attached garage. Any small spark can be enough to set off gas in the air.
Once you’re outside and a safe distance away, call 911 and your gas company. For most of North Texas, that’s Atmos Energy at 866-322-8667. Atmos asks that you not call from inside the house or anywhere near the smell. Don’t go back inside until the fire department or the gas company tells you it’s safe.
After the gas company has found and stopped the leak, that’s when we come in. We can find out why it happened, whether it was a loose fitting, a worn valve, or a damaged gas line to the fireplace, and get it repaired so you can use your fireplace again with peace of mind.
A quick note so you’re not alarmed for no reason: the first time you run a gas fireplace each fall, you may notice a light dusty or burning smell for a little while. That’s usually dust burning off the burner and logs after months of sitting. It smells very different from the rotten-egg smell of gas. If you’re ever unsure which one you’re smelling, treat it as gas and get out.
Why Annual Service Matters Even More on Gas
People often think a gas fireplace needs less care than a wood-burning one. In some ways it does. You don’t get the heavy creosote buildup that wood leaves behind. But gas has its own risks, and they’re harder to see.
With a wood fire, you can see the smoke and smell when something’s wrong. With gas, the most serious problem, carbon monoxide, has no color and no smell. A burner that’s out of adjustment, a log set that’s been moved out of place, or a vent that’s partly blocked can all cause a gas fireplace to make more carbon monoxide than it should. You won’t notice it until someone feels sick. That’s why we always recommend a working carbon monoxide alarm near any room with a gas fireplace.
North Texas summers add their own trouble. A gas fireplace can sit unused for six months or more. During that time, spiders like to build webs in the pilot and burner openings, birds and wasps build nests in the outside vent, and dust settles over everything. Then the first cold night comes, everybody turns their fireplace on at once, and that’s when these problems show up.
A yearly service visit catches these things before they turn into a no-heat call or a safety problem. We clean the burner and pilot, check the thermocouple and thermopile, look over the gas connections for leaks, make sure the logs are placed the way the maker intended, check the vent from end to end, and clean the glass. It’s a small visit that keeps your fireplace safe and working the way it should all winter. If you also have a wood-burning fireplace or want to know whether your gas unit’s chimney needs attention, our post on whether gas fireplaces need chimney cleaning too covers that.
When to Call Us
If your pilot won’t stay lit, your fireplace runs but doesn’t warm the room, or you just want it checked before the cold sets in, we can help. Our crew works on gas fireplaces, inserts, and log sets all across Dallas and Collin County, and we’ve earned over 700 five-star reviews from homeowners here.
You can read more about what we fix on our gas fireplace repair page. When you’re ready, call or text us at (469) 777-8432 and we’ll get you on the calendar.
And remember: if you ever smell gas, get outside first and call 911 and Atmos Energy. Call us after it’s safe.