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First make sure that gas is reaching the burners. If only one of several isn't lighting, but the others are, you know it's a problem with the individual burner.
Most of the time, issues with individual burners are resolved by either cleaning, adjusting, or replacing parts. Try these steps:
If none of those steps work, it's time to call a local service pro.
Safety first: if you smell gas when the oven is off, shut off the gas line and call the gas company immediately.
If you're satisfied that there's no gas leak, check to be sure that gas and electricity are reaching the oven: start a burner on the stove to check for gas, and make sure the oven is plugged in and turned on.
Having ruled out possible gas or electrical supply issues, other causes for this problem include:
a failed or failing ignitor,
bake/broil elements,
bake/broil spark electrodes,
a thermal fuse,
a wiring problem, or,
a failed relay board.
If you're a DIY'er, check the ignitor. Review the owner's manual, then:
turn off the circuit breaker,
remove the plate inside the oven that covers the ignitor and heating elements,
check to see that if ignitor is working; ignitors can partially fail, or fail completely,
if the ignitor is not glowing, or only glows dimly, you will need to replace it.
If the ignitor is not the problem, or DIY is not your cup of tea, contact a local appliance professional.
This issue can be hard to diagnose because there are so many possible causes. First, here are some quick things to check or consider:
Aside from the possible remedies above, other potential problems include:
a bad temperature sensor,
a bad heating element,
a failing or failed control panel.
If you can't track down and fix the problem yourself, or you're not a DIY'er, call an oven expert.
Gas ovens get their heating supply via gas, but rely on electrical power to manage and ignite the oven. Assuming you've confirmed that the oven is getting power, reasons for an over not starting up include:
a failed or failing ignitor or igniting electrode,
a loose wire or burnt wire,
a bad thermostat,
a bad control panel.
Skilled DIY'ers can check some of these issues by removing the panel that covered the ignitor and checking the ignitor/electrode, and wiring, and replacing any faulty components. Bad thermostats can be checked with a multimeter.
If you're not a DIY'er or just want help, contact a knowledgeable local appliance repair pro with expertise in oven repair.
Considerations include: