Clicks but Will Not Light
This is the most common La Cornue burner complaint and it is almost always about cleanliness. Spilled food or moisture on the burner cap and the spark igniter interrupts the spark, so you hear clicking with no flame. Let the burner cool, lift the cap, clear the ports gently, wipe and dry the igniter, and reseat the cap so it sits flat and square. Reseating matters: a cap set slightly off center will not light evenly. If a clean, dry, correctly seated burner still only clicks, the igniter or its wiring needs a technician.
Yellow or Lazy Flame
A healthy gas flame is crisp and blue. A yellow, floppy flame means the air-fuel mixture is too rich, and at Loveland-area elevation that is common on a range that was calibrated for denser low-altitude air. The fix is an air-shutter adjustment to lean the mixture back to a clean blue flame. On a hand-built La Cornue this is work for a technician who knows the burners, not a home adjustment, and it restores both a clean flame and full cooking output.
Uneven or Weak Flame
If one burner runs noticeably weaker than the others, or the flame is uneven around the cap, the ports are likely partly blocked by residue. Clean the cap and ports thoroughly and confirm the cap is seated. A burner that stays weak after a good cleaning may have a gas-flow or valve issue, which is a service item. Uneven heat across a single burner is worth resolving because it affects how evenly pans cook.
When Safety Takes Over
Some symptoms are not troubleshooting items. A gas odor that does not clear when the burner is off, a flame that lifts off the burner or will not stay lit, or soot forming on cookware all point to a gas-system problem. Turn off the burner and the range supply, ventilate the kitchen, and do not use the range until it has been inspected. On a range built to last decades, a proper gas-system check protects both the appliance and the home.
Symptom, Cause, Fix
| Symptom | Likely Cause | Fix |
|---|---|---|
| Clicks, no flame | Dirty or wet igniter and cap | Clean, dry, reseat; service igniter |
| Yellow, lazy flame | Rich mix at altitude | Technician air adjustment |
| Weak or uneven flame | Blocked ports or valve | Clean ports; service valve |
| Flame lifts or will not stay lit | Gas-flow or pressure issue | Stop use; professional inspection |
| Persistent gas smell | Gas-system fault | Shut off, ventilate, call service |
Flame Not Right?
Book a brand-focused diagnosis for your La Cornue. Diagnostic and travel fees, if applicable, are confirmed before the appointment and before repair approval.
Frequently Asked Questions
My La Cornue Burner Clicks but Will Not Light. What Is Wrong?
Why Does My La Cornue Flame Burn Yellow Instead of Blue?
Is It Safe to Keep Using a La Cornue Burner That Smells of Gas?
Related Reading
La Cornue Range Care
Oven and range symptoms.
La Cornue Maintenance Guide
Keep the range in shape.
Burner Not Igniting
Across gas brands.