3302 Westgrove Drive Arlington, TX 76001
A side burner that won’t light almost always comes down to one of four things: a clogged burner port, a spider web plugging the venturi tube, a spark electrode that’s fouled or cracked, or a propane regulator stuck in bypass. The fastest way to narrow it down is to check whether your main grill burners still light normally.
Side burners fail more often than main burners, and it isn’t because they’re built worse. They sit unused for months. A main burner gets fired every weekend, which burns off grease and keeps insects out. The side burner on your Blaze, Bull, Coyote, Summerset, or Lynx island might go from Thanksgiving to Memorial Day without a flame in it. That’s plenty of time for a mud dauber to nest in the venturi.
Does the main grill light normally?
If the main burners light fine and only the side burner won’t, the problem is in the side burner itself, not your gas supply. That single test splits the diagnosis in half and takes ten seconds.
Main burners light, side burner doesn’t: look at the side burner’s orifice, venturi, burner ports, and electrode. Gas is reaching the manifold fine.
Nothing lights anywhere: the problem is upstream. Empty tank, closed shutoff valve, a regulator in bypass, or a natural gas supply issue. On a built-in island, check whether somebody bumped the shutoff valve inside the cabinet door while grabbing a cooler.
What is bypass mode, and why does it kill the side burner first?
Bypass is a safety device inside every propane regulator that chokes gas flow down to a trickle when it thinks you have a leak. The side burner is usually the first thing to stop working because it needs less gas than the main burners and shows the shortage more obviously.
According to Weber, the federally mandated safety device built into propane hose regulators since around 1995 reduces gas flow from the tank to about 10% or less of normal volume when it reads a condition as a leak. Weber’s fix: turn every knob off, including the side burner knob, open the tank valve, then wait several seconds for pressure to equalize before lighting anything.
Open the tank valve fast with a knob already on and you’ll trip it every time. Cold mornings make it worse.
Is it the igniter or the gas?
Hold a long lighter next to the burner and turn the knob. If it lights, your gas is fine and the igniter is the problem. If it still won’t catch, gas isn’t reaching the burner.
This is the test that saves people from replacing an ignition module they didn’t need. Do it with the lid or cover open and your face out of the way.
| What you see | Likely cause | Fix | DIY or pro |
|---|---|---|---|
| Sparks at the electrode, no flame | Clogged orifice or venturi | Clear the orifice and venturi | Pro on built-ins |
| No spark, no click | Dead battery or corroded terminal | Replace battery, clean contacts | DIY |
| Clicking but no spark | Cracked ceramic electrode | Replace the electrode | DIY or pro |
| Lights with a match, dies in seconds | Partial venturi blockage | Clear the venturi tube | Pro |
| Weak yellow flame, low heat | Regulator in bypass or wrong orifice | Reset regulator, verify LP vs natural gas | DIY, then pro |
| Only part of the burner ring lights | Grease-plugged burner ports | Clear ports and deep clean | DIY or pro |
How do spiders shut down a side burner?
Small spiders and mud daubers are attracted to the mercaptan odorant added to propane and natural gas, and they nest inside venturi tubes where the gas mixes with air. A blocked venturi starves the burner, and gas that can’t get through backs up and burns where it shouldn’t.
This isn’t rare in North Texas. Our crews pull webs and mud nests out of venturi tubes constantly in Grapevine, Colleyville, Southlake, and Keller, especially on side burners that sat through spring. We covered the fire risk in our guide to the spider in your grill.
According to the National Fire Protection Association, a leak or break is the leading factor contributing to gas grill fires. A partially blocked venturi is a gas delivery fault, and gas delivery faults are what start those fires.
How do you clean a side burner yourself?
You can safely handle the burner cap, ports, and electrode yourself. Leave the orifice, manifold, and any gas fitting alone unless you’re comfortable leak-testing your work afterward.
- Shut off the gas at the tank valve or the shutoff inside the island cabinet. Confirm it’s off.
- Lift off the grate and the burner cap. Most side burner caps sit loose or come off with one screw.
- Brush the burner ports with a stiff brass brush, then clear individual holes with a paperclip or a small drill bit turned by hand. Never force a drill bit with power tools.
- Wipe the ceramic electrode with rubbing alcohol on a rag. Grease film on ceramic blocks the spark.
- Check the electrode gap against your manual. Most sit between an eighth and a quarter inch from the burner.
- Look down the venturi tube with a flashlight. If you see webbing or mud, stop and call somebody.
- Reassemble, open the gas slowly, and light the burner. A correct flame is blue with maybe a small yellow tip.
If you’re already in there, do the whole cabinet. The drip tray, grease cup, and main burner tubes are usually worse than the side burner. Our professional grill cleaning covers all of it in one visit.
Is it worth repairing a side burner or should you just replace it?
Repair it if the burner body and venturi are intact and the housing hasn’t rusted through. Replace the whole unit when the burner has burned through or the drop-in pan has corroded.
Blaze rates its LTE built-in power burner at 60,000 BTUs, and a unit at that output has real hardware in it worth fixing. Standard drop-in side burners in the 12,000 BTU range are simpler, and on those the electrode and burner cap are usually the only parts that ever fail.
Cut-out dimensions matter more than brand. If your island was built around a specific drop-in footprint, swapping brands usually means masonry work. That’s the part homeowners don’t see coming.
What does side burner service cost in DFW?
Our grill deep cleans start at $239, and side burner diagnosis is included when we’re already on site for a cleaning. Repair pricing depends on parts, so we quote it after we’ve looked at the unit. Estimates are free.
We work on built-in outdoor kitchens across the Metroplex, including Grapevine, Dallas, Fort Worth, Arlington, Plano, and Frisco. Current rates are on our pricing page, and the full coverage map is on our service areas page.
For gas delivery problems, cracked manifolds, valve replacement, and burner work, see our gas grill repair service. If the main burners are giving you trouble too, start with our guide to a grill that won’t get hot on one side.
Frequently asked questions
Why does my side burner light but go out when I set it to low?
A burner that lights on high and dies on low usually has partially blocked ports or a partially obstructed venturi. On high, enough gas pushes through to sustain a flame. On low, the reduced flow can’t overcome the restriction. Clean the ports first. If it still drops out, the venturi needs to be cleared.
Can I use my grill if the side burner won’t light?
Usually yes, as long as you smell no gas and the main burners light and burn blue. Turn the side burner knob fully off and leave it off. If you smell gas anywhere near the island at any point, shut off the supply at the tank or the cabinet valve and don’t use the grill until it’s been inspected.
How often should a side burner be cleaned?
At least once a year, and before the first use after any long idle stretch. Side burners collect debris precisely because nobody uses them. In North Texas, spring is the highest risk window, since that’s when insects nest and when most grills have been sitting since the holidays.
Does a natural gas side burner get clogged the same way?
Yes. Natural gas carries the same mercaptan odorant that attracts spiders and mud daubers, so venturi nesting happens on both fuels. Natural gas units skip the propane regulator bypass problem entirely, but they add their own failure mode: an orifice sized for the wrong fuel, which produces a weak or yellow flame.
Is a side burner and a power burner the same thing?
No. A standard side burner runs around 12,000 BTU and handles a saucepan or a pot of beans. A power burner runs far higher and is built for wok cooking, crawfish boils, and turkey frying. Power burners have larger orifices and heavier burner castings, and they need more clearance around the island.
Why does my side burner spark but never catch?
Sparking means the ignition system works and gas isn’t arriving. The usual culprits are a plugged orifice, a blocked venturi, or a valve that isn’t opening. Confirm it with a long lighter. If the burner lights from a flame source but not from the spark, the problem flips and you’re looking at electrode position instead.
Can a blocked side burner cause a fire?
It can contribute to one. When gas can’t exit the burner normally, it finds another path, which is how flashback fires under a control panel start. NFPA identifies a leak or break as the leading contributing factor in gas grill fires. If you see flame anywhere other than the burner itself, shut the gas off immediately.
Get it looked at
If your side burner won’t light and you’d rather not take apart a gas appliance in your own backyard, we’ll handle it. Book an appointment online or call (817) 791-4606. Free estimates.
Texas Grill Clean is part of 1st Choice Residential, veteran-owned and locally owned rather than a franchise, serving Dallas–Fort Worth since 2009. Licensed and insured.