Direct answer: Most gas cooktop burners that will not ignite are dealing with a misseated burner cap, clogged burner ports, moisture around the igniter, or a weak spark at one burner. If you smell gas without ignition, stop and ventilate the area before doing anything else.
Most likely: Start with the burner cap and burner head. If the cap is off-center or the flame ports are packed with grease, the spark can click all day and never light the gas.
First separate the symptom: is the burner clicking but not lighting, not clicking at all, or are all burners affected? That tells you whether you are dealing with a burner-top problem, a wet or dirty igniter area, or a cooktop ignition part. Reality check: one dead burner is usually local to that burner. Common wrong move: scrubbing the igniter tip hard or poking burner ports with a toothpick until debris gets packed deeper.
Don’t start with: Do not start by buying a cooktop spark igniter or cooktop ignition switch. Those parts fail, but dirty or misaligned burner parts are more common.
You hear rapid clicking and may smell a little gas, but the flame never catches or only lights after several tries.
Start here: Check burner cap position, clogged burner ports, and moisture around the igniter first.
Turning the knob gives gas flow or nothing happens, but there is no visible spark and no clicking sound at that burner.
Start here: See whether other burners still spark. If they do, suspect that burner's igniter path or switch issue after the easy top-side checks.
Gas is reaching the burner, and the burner works once manually lit, but the built-in ignition will not light it.
Start here: That points away from a gas supply problem and toward a dirty, wet, cracked, or failed cooktop spark igniter or burner head issue.
More than one burner will not ignite, or none of them click or light normally.
Start here: Check for power loss to the cooktop, a tripped outlet or breaker if applicable, or a broader ignition problem before replacing single-burner parts.
The spark may be present, but the gas is not being directed across the igniter where it needs to catch.
Quick check: Remove the grate, let the burner cool, and make sure the cap sits flat without rocking.
Gas cannot spread evenly around the burner ring, so ignition is delayed or never reaches the spark point.
Quick check: Look for blocked slots or holes on the burner head, especially near the igniter side.
After cleaning or a spill, the spark can short to metal instead of jumping cleanly where it should.
Quick check: If the problem started right after cleaning or a boilover, dry the burner area thoroughly and try again later.
Once the burner is clean, dry, and aligned, a weak spark, cracked ceramic, or dead switch becomes more likely.
Quick check: Watch for a strong blue-white spark at that burner while other burners ignite normally.
Gas ignition problems are manageable until raw gas starts building up or the spark behavior gets erratic.
Next move: If the gas smell clears and the cooktop is otherwise normal, move on to the burner-top checks. If you still smell gas strongly with the burner off, stop using the cooktop.
What to conclude: A strong lingering gas smell is not a normal burner-top cleaning issue. It needs professional attention before more testing.
This is the most common fix, especially when only one burner will not light.
Next move: If the burner lights normally now, the problem was alignment or surface debris. If it still clicks without lighting, keep going and clean the gas ports more carefully.
What to conclude: A burner that improves after reseating was not directing gas across the spark correctly.
Packed burner ports and hidden moisture are the next most common reasons a burner clicks but will not catch.
Next move: If the burner now lights within a click or two, the issue was blocked gas flow or moisture. If gas is present but the burner still will not light, compare the spark on this burner to a working burner.
This separates a bad burner-top part from a broader ignition problem without guessing.
Next move: If manual lighting works but self-ignition does not, you have narrowed it to the ignition side or burner-top flame path rather than gas supply to that burner. If there is no gas flow, no spark on any burner, or multiple burners act the same, stop short of part swapping and arrange service.
By now you should know whether this is a simple burner-top repair or a riskier ignition problem that should not be guessed at.
A good result: If the burner lights promptly and repeatedly after the repair, recheck flame quality and put the cooktop back in service.
If not: If the new top-side part does not fix it, do not keep buying ignition parts one by one.
What to conclude: A clean single-burner failure often ends with a burner head or igniter. Multi-burner or gas-smell problems need a more careful service diagnosis.
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Most of the time the burner cap is off-center, the burner ports are clogged, or the igniter area is wet or dirty. The spark may be working, but the gas is not reaching the spark correctly.
That usually means the problem is local to that burner. Start with the burner cap, burner head, and igniter area before suspecting a broader cooktop problem.
You can use a careful one-time test if you are comfortable and there is no strong gas smell. If the burner lights manually but not from the igniter, that points toward an ignition-side problem rather than no gas to the burner.
Not usually. On gas cooktops, dirty ports, a misseated cap, or moisture are more common than a bad igniter. Replace the igniter only after those checks support that call.
A wet or dirty igniter area can cause stray sparking, and a failing cooktop ignition switch can also keep the module clicking. Dry and clean the burner area first. If the clicking continues, service is the safer next step.
Check whether the cooktop has power for the ignition system and whether any outlet or breaker issue is present. If there is no spark anywhere or gas supply seems questionable, stop short of guessing at parts and arrange service.