LG Gas Stove Burner Won't Turn Off: Causes & Fix
On an LG gas stove, a burner that keeps flaming after you turn the knob to off is most often a stuck gas valve — the valve stem no longer seats fully closed, so gas keeps feeding the burner. A worn knob or shaft and a broken valve spring are the other two culprits.
A Burner That Won't Shut Off: Start Here#
Before diagnosing anything, make the range safe. A burner you cannot shut off is releasing gas and heat you no longer control. If turning the knob fully to the off position does nothing, shut off the gas supply to the range at the shutoff valve behind it and ventilate the kitchen before you troubleshoot further. Do not leave an uncontrollable open flame unattended.
The Three Things That Cause It#
| What you notice | Likely cause | How common | Fix path |
|---|---|---|---|
| Flame stays lit with the knob off; knob turns normally | Stuck gas valve (stem not seating) | Most common | Professional gas valve replacement |
| Knob spins loosely or won't reach the off detent | Damaged control knob or valve shaft | Common | Replace the knob and, if worn, the valve stem |
| Knob reaches off but the burner creeps back on | Broken valve return spring | Occasional | Replace the valve assembly |
A stuck valve is the classic version of this fault. Over years of heat cycling, grease and residue work into the valve body, or the internal seat wears, and the stem stops closing all the way. Because the fix is inside a live gas valve, it is not a DIY job — a technician replaces the valve with the gas isolated.
A damaged knob or shaft is more mechanical. If the knob feels loose, slips, or won't click into the off detent, it may not be rotating the valve stem far enough to close it. Sometimes a new knob restores full travel; if the stem itself is stripped, the valve is replaced.
A broken spring shows up as a burner that reaches off and then drifts back on. The return spring that snaps the valve closed has failed, so the valve doesn't hold its closed position. Again, the repair is a valve replacement.
Do You Have the Right Tools?
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What You Can Safely Check#
You can confirm which burner is affected and whether the knob still has full travel — turn each knob through its range and feel for the off detent. You can also verify the knob is fully seated on the stem. Beyond that, anything inside the gas valve is a professional repair; never try to free a stuck valve by force or lubricant while gas is connected.
Why These Valves Stick in the First Place#
Understanding the wear pattern helps you judge urgency. A surface-burner valve is a small brass body with a tapered stem that rotates to meter gas and seats fully closed at the off position. Years of heat cycling bake grease and cooking residue into that assembly, and the original lubricant that lets the stem turn smoothly dries out. As it does, the stem starts to bind, and eventually it no longer rotates all the way back to the closed seat — so a little gas keeps feeding the burner even at off. The same aging explains the loose-knob and weak-spring versions: the plastic knob wears where it grips the stem, and the internal return spring loses tension. None of this is something a homeowner should try to service, because the repair lives inside a live gas path where a poor reseal becomes a leak. What you can do is recognize the pattern early — a burner that gets harder to shut off, or needs the knob jiggled to go out, is a valve on its way to sticking, and it's better addressed before it stops closing entirely.
Safety First — Know the Risks
Appliances involve high voltage (120-240V), pressurized water, gas lines, and chemical refrigerants. Over 400 DIY repair injuries are reported yearly. Our techs are licensed and insured — let them handle the risk.
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Getting It Fixed#
Because every cause here ends at the gas valve or its knob, the safe path is a technician who can isolate the gas, replace the valve, and leak-test the result. Book a diagnostic and we'll confirm whether a knob swap or a full valve replacement is what your range needs.
Senior Appliance Repair Technician · 15 years experience
EPA-certified technician with 15 years of experience specializing in refrigerator and cooling system repairs.
