Gas Oven Not Lighting: Causes & Fixes
A gas oven that won't light is almost always caused by a weak or failed igniter — but a few other possibilities are worth ruling out first, and safety should always come first with gas appliances.
Safety note: If you ever smell gas, do not attempt to light the oven or flip any switches. Leave the house, and call your gas utility or 911 from outside. Gas oven repairs beyond basic troubleshooting should always be handled by a licensed technician.
Common causes
Weak or failed igniter
The igniter must glow hot enough to open the gas safety valve and ignite the burner. A weak igniter may glow but never get hot enough — this is the single most common cause of a gas oven not lighting.
Faulty safety valve
The oven safety valve only opens once the igniter reaches the correct temperature. If the valve itself fails, gas won't flow even with a working igniter.
Clogged igniter or burner ports
Food debris and grease can clog the small ports the gas flows through, weakening or preventing ignition.
Gas supply issue
Confirm other gas appliances (stovetop burners) are working — if nothing in the house has gas, this points to a supply issue rather than the oven itself.
What to check first
Check that the stovetop burners work
If stovetop burners light fine but the oven won't, the issue is isolated to the oven's igniter or valve — not the home's gas supply.
Look at the igniter while attempting to light
You should see it glow orange within about 30-60 seconds. If it glows but the burner never ignites, the igniter is too weak to open the safety valve — this is the classic worn-igniter symptom.
Check for a burning smell without ignition
A brief smell of gas that clears on its own during a failed ignition attempt can be normal; a persistent or strong smell is not — stop immediately.
Clean visible burner ports
With the oven off and cool, gently clean visible debris from the burner ports at the back of the oven cavity.
When to call a technician
Igniter and safety valve replacement both involve working directly with the gas line and require a licensed technician — this isn't a DIY repair. If you smell gas at any point, stop immediately and call a professional rather than continuing to troubleshoot.
Frequently asked questions
Is a gas oven not lighting dangerous?
The oven not lighting itself isn't dangerous — the built-in safety valve is designed specifically to prevent gas from flowing without ignition. But any persistent gas smell is dangerous and should be treated as an emergency.
How much does gas oven igniter replacement cost?
Igniter replacement typically runs $150 to $300 including the diagnostic, part, and labor.
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