Grill Patrol
Gas grill troubleshooting

One side of the grill not working? Fix a dead burner.

When only one burner is dead while the others run fine, the problem is almost always isolated to that burner: a spider nest in the venturi tube, clogged ports, or a burned-through tube. Work through the free-fix ladder below and you will usually find the cause without spending anything.

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Know the symptom? Jump to it

Isolate ignition vs gas Venturi tube Burner ports Crossover ignition Regulator Replace parts

A single dead burner is almost always a cleaning problem or an ignition issue, not a reason to replace the grill.

Time
20 to 30 minutes
Cost
Usually free
Skill
Beginner-friendly
Tools
Flashlight, thin wire, long lighter
  1. 1 Manual-light the dead burner to isolate ignition from gas flow
  2. 2 Clear the venturi tube spider nest
  3. 3 Clean clogged ports on the dead burner
  4. 4 Test the crossover flame path from the adjacent burner
  5. 5 Do a regulator reset if the burner lights but runs weak
  6. 6 Replace the burner tube only if corroded through

What is the dead burner doing?

The exact behavior tells you whether to start with ignition, gas flow, or hardware.

Burner will not light at all, others light normallyIgnition or crossover is not reaching it. Try manual lighting.
Burner lights, then immediately goes outGas flow restricted: venturi nest or clogged ports. Clean first.
Burner lights but runs very weakPartially blocked venturi or ports, or a failing control valve.
Burner has visible rust holes or damageBurned-through tube. Cleaning will not fix it. Replacement needed.

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Free fixes first

Every step below costs nothing. Work through these before ordering any parts.

Manual-light the dead burner to isolate the problem

Lighting with a long lighter tells you immediately whether this is an ignition problem or a gas-flow problem.

Deep dive

The single most useful diagnostic for a dead burner is trying to light it manually. Hold a long lighter flame directly over the ports of the dead burner, then open the burner knob. If the burner lights immediately and stays lit, the gas supply is fine and the problem is ignition only: the igniter or crossover is not reaching that burner. If the burner does not light even with a flame held over it, or lights briefly and then goes out, the problem is gas flow.

This split tells you exactly where to focus. An ignition-only problem is usually a crossover issue (step 4). A gas-flow problem points to the venturi tube or ports (steps 2 and 3).

Clear the venturi tube on the dead burner

Spider nests and debris in the venturi tube are the top cause of a single burner that will not light or stay lit.

Deep dive

Spiders and mud daubers build nests inside venturi tubes between cooks, especially during storage. A blocked venturi on one specific burner will starve only that burner of air, causing it to light poorly or not at all while the others run fine.

With gas disconnected and the grill cool, remove the dead burner from its support bracket (usually a single screw or a simple lift). Shine a flashlight into the wide inlet end of the venturi tube. Any webbing, mud, or debris will be visible near the opening.

Run a thin flexible brush or pipe cleaner from the inlet toward the burner to clear the blockage. Shake out any debris. Reinstall the burner, light it, and check whether it now stays lit.

  • Unlocks a free fix

    Venturi tube cleaning brush

    A long, thin flexible brush sized for venturi tubes clears spider webs and debris without pushing the blockage deeper. Keeps both problem burners and healthy burners running cleanly each season.

    See venturi brushes on Amazon →

Clean the burner ports on the dead burner

Clogged ports restrict gas to the flame and can prevent the burner from staying lit.

Deep dive

With gas disconnected and the grill cool, remove the grates and flavorizer bars. Inspect the ports on the dead burner tube with a flashlight. The ports are the small holes along the top and sides of the tube. You should be able to see light through each one. Darkened or crusted holes are clogged.

Clear each blocked port with a stiff piece of wire or a straightened paper clip, working from the outside. Do not enlarge the ports: their diameter is sized to produce the right gas-to-air ratio. Sweep out loose debris with a brush.

Reinstall the burner and light it. A burner that previously struggled to stay lit often holds its flame reliably after a port cleaning.

Check the crossover ignition path

If the dead burner will light manually but not from the igniter sequence, the crossover flame path is the issue.

Deep dive

Most gas grills light one primary burner from the igniter and use a crossover port or tube to carry that flame to adjacent burners. If the crossover between the lit burner and the dead one is blocked, the dead burner simply never receives the ignition flame.

Test this directly: light the burner adjacent to the dead one and watch whether its flame travels and lights the next burner within about 5 seconds. If the adjacent burner lights but does not carry across, look at the crossover port between them. It is a small slot or hole at the inner end of the burner tube. Clear it with a thin wire if it is clogged. If the crossover connector itself is broken or missing, a replacement igniter or crossover part is needed.

Do a regulator reset

If the dead burner lights manually but still runs very weak, a bypassed regulator can restrict flow unevenly.

Deep dive

Although the regulator usually affects all burners equally when it trips into bypass mode, a weak flow can sometimes affect one burner more noticeably than others, particularly if that burner already has slightly more resistance in its valve. If the dead burner now lights after cleaning but runs noticeably weaker than the others, do the regulator reset before considering valve replacement.

The reset:

  1. Turn all burner knobs off.
  2. Close the propane tank valve.
  3. Disconnect the regulator from the tank.
  4. Wait 30 seconds.
  5. Reconnect and hand-tighten.
  6. Open the tank valve slowly, over about 3 to 4 seconds.
  7. Light the grill and compare the weak burner to the others.

If the burner now matches the others, the regulator reset was the final piece. If it is still weaker, the control valve for that burner may need replacement.

Free fixes done and still dead? Time for parts

If the venturi tube is clear, the ports are clean, and the burner still will not fire, the tube itself is likely corroded through. Rust holes let gas escape before it reaches the ports. Replacement burner tubes are model-specific: confirm your brand and model before ordering.

Own a Weber Spirit E-210 or S-210?

Burner tubes are model-specific. For the front-control Weber Spirit E-210 or S-210, this stainless aftermarket tube fits that model run exactly. Confirm your grill is the front-control 200-series before ordering.

Weber Spirit burner tube on Amazon →

Not sure which Spirit you have? Our Spirit 200 vs 300 parts guide sorts it out. For 300-series parts, see the Weber Spirit 300 parts guide.

FAQ

Why would only one side of my grill stop heating?

When only one burner is dead, the cause is almost always isolated to that burner: a spider nest in its venturi tube, clogged ports, or a burned-through tube. If the burner lights briefly then dies, the crossover igniter may not be reaching it, or there is a flow restriction specific to that valve. A problem affecting only one burner is rarely caused by the regulator, which affects all burners equally.

How do I know if it is an ignition problem or a gas-flow problem?

Try lighting the dead burner with a long lighter while holding the knob open. If it lights and stays lit, the problem is ignition only: the igniter or crossover is not reaching that burner. If it lights briefly then goes out, or will not light at all even with a flame held to it, the problem is gas flow: a blocked venturi, clogged ports, or a faulty valve.

What is a crossover and how does it ignite a burner?

Most gas grills ignite only one burner directly with the igniter. A small crossover tube or port carries the flame laterally from the lit burner to the adjacent burner, igniting it in sequence. If the crossover is blocked or a burner is positioned too far from the next, the second burner will not light from the sequence. You can confirm crossover function by lighting the first burner and watching whether the second lights on its own.

Is it safe to manually light a burner that will not ignite automatically?

Yes, with a long lighter. Hold the lighter flame over the ports of the dead burner and open the burner knob. The burner should light immediately. If it does not light within 5 to 10 seconds, close the knob and wait before trying again. Never lean over the grill while holding the knob open without a flame source: gas can accumulate and ignite suddenly.

My dead burner has visible holes in the tube. Does it need replacement?

Yes. Rust holes in the burner tube let gas escape before it reaches the ports, which is why the burner does not heat effectively. Cleaning will not seal rust holes. You need to replace the burner tube. Match the replacement to your grill brand and model: tube length, inlet diameter, and port pattern all vary.

Can I still cook with one dead burner?

Yes, with adjustments. A two-burner grill with one dead burner is effectively half the cooking surface, but many cooks can still be done over the remaining hot side. A three-burner grill with one burner dead can still be used with a two-zone setup. Fix the dead burner before your next cook that needs full heat.

I cleaned the venturi and ports and the burner still will not stay lit. What next?

The next check is the control valve for that specific burner. Try cycling the knob through its full range: does the flame respond (or does the burner fail to light at all)? A valve that fails to open, or opens only partially, will starve that burner even with a clear venturi. Replacement control valves are grill-specific, so search for your brand and model.

Related guides

Burner fixed but the grill still needs work?

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No burners lighting at all? Gas grill won't ignite covers the full ignition diagnostic.