Direct answer: Most gas cooktop ignition failures come down to a misseated burner cap, blocked burner ports, moisture around the igniter, or a failed spark part on that burner. Start with the burner pieces you can see and clean before assuming a bigger failure.
Most likely: If one burner is acting up and the others light normally, the problem is usually right at that burner: the cap is off-center, the burner head ports are dirty, or the cooktop igniter is weak or not sparking in the right spot.
First separate the pattern. If you hear clicking and smell a little gas but the flame never catches, stay focused on burner alignment, debris, and spark at that burner. If there is no clicking at all, or every burner is dead, the problem shifts toward power to the cooktop or the cooktop ignition switch circuit. Reality check: a burner that worked yesterday can quit today just from a wet cleanup or a cap set down slightly crooked. Common wrong move: scrubbing the igniter hard with something abrasive and cracking the ceramic.
Don’t start with: Do not start by ordering a cooktop spark module or taking apart gas lines. On this symptom, the simple burner-top checks solve a lot of calls.
The rest of the cooktop lights normally, but one burner either clicks without lighting or does nothing.
Start here: Start at that burner cap, burner head, and igniter tip. A single-burner problem is usually local, not a whole-cooktop failure.
None of the burners spark or light, or all of them click but no burner catches.
Start here: Check for power to the cooktop and make sure gas supply to the appliance is actually on before going deeper.
Gas is reaching the burner, but the built-in spark is weak, off-target, or absent.
Start here: Watch the igniter while turning the knob. If gas is present but the spark is missing or misplaced, focus on the cooktop igniter and burner alignment.
The burner clicked fine before a spill or wipe-down, then stopped lighting or kept clicking.
Start here: Let the burner area dry fully, then clean and reseat the burner parts. Moisture and residue are common here.
Gas burners need the cap and head seated correctly so gas flows evenly past the spark. A cap that is just a little crooked can stop ignition.
Quick check: Lift the cap off, wipe the seating surfaces, and set it back so it sits flat without rocking.
If the small gas openings are blocked, gas will not reach the spark where it needs to. You may hear clicking and smell gas, but the flame will not travel.
Quick check: Look for packed debris in the burner head holes or slots, especially near the igniter side.
After cleaning or a boilover, the spark can short to the wrong spot or weaken until the area dries out.
Quick check: Look for dampness, white residue, or a spark snapping to metal below the burner instead of the burner edge.
If the burner is clean and aligned but there is no spark, or only one knob never triggers clicking, the ignition parts for that burner become more likely.
Quick check: Turn the knob in a dim room and watch for spark. No visible spark at a clean, dry burner points toward a failed ignition part.
You do not want to chase burner parts if the cooktop has no power for ignition or no gas reaching the appliance.
Next move: If other burners light and the problem is only one burner, stay at that burner and move to cleaning and alignment. If no burners spark or none of them light, stop treating this like a single-burner issue. You likely have a power, ignition circuit, or gas supply problem.
What to conclude: One dead burner usually means a local burner or igniter issue. All burners dead points away from the burner cap and toward supply or shared ignition parts.
This is the most common fix and it costs nothing. These burners are picky about how the cap and head sit.
Next move: If the burner lights normally now, the issue was alignment or residue under the burner pieces. If it still clicks without lighting, move on to clearing the burner ports and checking the spark path.
What to conclude: A burner that starts working after reseating was not directing gas to the spark correctly.
Blocked gas ports and leftover moisture are the next most common reasons a burner clicks but will not catch.
Next move: If the burner lights after cleaning or drying, the problem was blocked gas flow or moisture shorting the spark. If the burner still will not light, pay close attention to whether the spark is present and whether it is hitting the right spot.
At this point, the pattern matters more than more cleaning. You need to know whether the burner has gas but no usable spark, or no spark command at all.
Next move: If you clearly see a spark landing at the burner edge but the burner still will not light, go back and recheck for blocked ports or a damaged burner head. If there is no spark at a clean, dry, properly seated burner, or the spark is weak and off-target, the cooktop igniter is the likely repair. If this knob never triggers clicking, the cooktop ignition switch is a stronger suspect.
Once the burner is clean, dry, and aligned, the remaining likely fixes are the burner-specific ignition parts. This is where buying a part starts to make sense.
A good result: If the burner now lights within a few clicks and burns evenly around the ring, the repair path was correct.
If not: If a new burner-top part does not restore ignition, the fault is likely deeper in the cooktop wiring or spark module and is a better service call than a parts gamble.
What to conclude: A single burner that still fails after top-side cleanup usually needs a burner-specific ignition component. Whole-cooktop failures point to shared components or supply issues.
Repair Riot may earn a commission from qualifying purchases, at no extra cost to you.
Usually the burner cap is not seated right, the burner ports are clogged, or moisture is shorting the spark. If the burner is getting gas but the spark is weak or off-target, the cooktop igniter is the next likely fault.
That usually means the problem is local to that burner. Start with the burner cap, burner head, and igniter at that spot before suspecting a whole-cooktop part.
Stick with a dry cloth or a cloth lightly dampened with warm water and mild soap around the burner area, then dry it well. Harsh cleaners and heavy soaking can leave residue or damage the igniter area.
For that burner, yes, gas is likely reaching it. That points more toward a spark problem, burner alignment issue, or blocked burner ports than a gas supply failure.
Not first. On a single dead burner, burner-top issues and burner-specific ignition parts are more common. A shared ignition module becomes more likely when several burners act up together or the symptoms are not isolated to one knob or burner.
Moisture around the igniter and residue under the burner cap are both common after cleaning. Let the area dry fully, reseat the burner parts, and try again before replacing anything.