La Cornue Burner Ignition Problems: Why It Clicks but Will Not Light

The short answer: when a La Cornue burner clicks but will not light, spark and gas are not meeting the way they should. The everyday causes are a clogged burner port, a burner cap that is not seated, or moisture left on the igniter after cleaning, all of which an owner can address with the burner cold and the gas off. If a strong spark and a clean, seated burner still will not light, the igniter, spark module, or gas valve is involved and needs a technician. Because this is a gas appliance, stop clicking after a couple of tries.

How Ignition Is Supposed to Work

Turning the knob on a La Cornue burner does two things at once: it opens the gas valve to feed the burner and it triggers the igniter to throw a spark across a small gap right at the burner's edge. When it works, the spark lights the gas the instant it reaches the ports. Ignition fails when one half of that pairing is missing at the right spot: gas is flowing but the spark is weak or misplaced, or the spark is strong but gas is not reaching the ports evenly. Almost every no-light complaint comes down to which of those two is broken, and the symptoms tell you which.

Symptoms and What They Point To

What You Can Safely Do

With the burner fully cold and the knob off, lift the burner cap and look at the small flame ports and the igniter tip. Clear the ports gently with a soft brush or a wooden toothpick, since spillover and grease commonly plug the openings near the igniter. Wipe the area, reseat the cap squarely so it sits flat and centered, and let everything dry completely if the burner was recently cleaned, because a wet igniter will spark uselessly. These steps resolve a large share of no-light complaints, especially the ones that started right after a spill or a scrub.

When the Spark Is the Problem

If the ports are clean, the cap is seated, and gas is clearly flowing to the other burners, but this one clicks weakly or not at all, the igniter side is the issue. La Cornue cooktops share a spark module that powers the electrodes, so a weak or dead spark can come from the individual igniter electrode or from the module itself. This is where owner troubleshooting ends. Testing the electrode, the module, and its wiring, and replacing the failed part, is a technician's job on a gas appliance.

When Gas Flow Is the Problem

A burner that sparks strongly but still will not light, with clean ports, points at gas not reaching the burner properly. That can be a partially blocked orifice, a valve that is not opening fully, or a supply issue upstream. None of these are owner repairs. The orifice, the burner valve, and the gas supply need to be checked and serviced by a qualified technician who can confirm proper pressure and a safe, even flame.

What a Technician Checks

Diagnosis follows the symptom. For a weak or dead spark, the technician tests the igniter electrode, the shared spark module, and the wiring, then replaces the failed component. For a strong spark that will not light, the burner orifice and valve are checked and the gas pressure verified, and the flame is confirmed to burn clean, blue, and even. For dead spots in an otherwise lit burner, the ports and burner head are cleaned or replaced. Our technicians service these hand-built ranges with OEM La Cornue igniters, spark modules, and burner parts. You can see the wider set of ignition causes on our burner not igniting guide.

When to Call a Technician

Clean the ports, reseat the cap, and dry the igniter first, since those fix most no-light complaints. Call for service when the spark is weak or dead after cleaning, when a strong spark still will not light a burner with clean ports, when no burner on the range sparks at all, or any time you smell gas. Igniters, spark modules, orifices, and gas valves all require a qualified technician on a gas appliance. Completed repairs include a 180-day repair warranty. Written terms are provided with the repair.

Frequently Asked Questions

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