--- title: "Yellow or orange flame" description: "La cornue orange range — la Cornue yellow or orange flame — a gas flame on this range should be blue with a defined inner cone." url: "https://la-cornuemiami.support/symptoms/yellow-or-orange-flame/" date_modified: "2026-09-03" Appliance type: "Cooktops and rangetops, Ranges, Rangetops" --- # La Cornue yellow or orange flame ### The one thing to look at before calling One burner or all of them. A single yellow burner is usually a blocked or partly closed air shutter, a dirty orifice or a burner cap sitting slightly off its seat — small, local and cheap. Every burner yellow at once means the fuel or the supply pressure is wrong for the way the range is set, and that is where a propane conversion, a moved range or a new regulator comes into it. Also worth knowing: a brand-new orange flicker for the first minute after lighting on a range that has been idle for weeks is dust burning off and is not this. ### What it usually means, by the kind of La Cornue appliance La Cornue sells one appliance in several forms, and the same behavior points at different things on each of them. A built-in side-by-side and an integrated column are not the same service situation, and a dual-fuel range and an induction range fail in different halves. - **Château gas and dual-fuel** — Orifices and air shutters are set for the fuel specified at order time, and altitude above 2,000 feet is specified too. - **CornuFé 90 and 110 dual fuel** — La Cornue publishes a conversion procedure and a parts set for these two models specifically. A conversion done without them looks exactly like this. - **All-induction** — No flame at all. Nothing on this page applies. ### Why this matters beyond the cooking A yellow flame is incomplete combustion, and incomplete combustion produces carbon monoxide as well as soot. On a range with six or eight burners and a gas oven, in a kitchen with the windows shut and the air conditioning on, that is not a cosmetic complaint. It is also the fastest way to ruin cookware and the enamel around a burner. We treat a whole-range yellow flame as a priority call rather than a maintenance one. ### Propane, altitude and the paperwork La Cornue specifies fuel type at order time and asks about installation above 2,000 feet, and it publishes a conversion procedure with a defined parts set for the CornuFé 90 and 110. What we see is ranges converted with universal kits, ranges converted in part — the fronts done and the plaque burner forgotten — and ranges moved from a propane house to a natural-gas one with nothing changed at all. All three produce this page. Fixing it properly means the maker’s own orifices, every burner set, a leak check, and a written note of what the range is now on. A propane conversion done with the wrong parts The commonest cause on a range that changed fuel or house. The maker publishes the correct orifice set. A partly closed or blocked air shutter Local to one burner, and adjustable rather than replaceable. A dirty or damaged orifice A deformed port or a spider's nest in a summer-idle burner. Both real, both cheap. A burner cap off its seat Reassembled slightly wrong after cleaning, which changes the mixture immediately. Supply pressure out of specification Measured at the manifold. Where every burner is wrong and the parts are right, this is why. Look at the color properly In a dim kitchen, not in daylight. Blue with a defined cone is right; yellow tips are not. Check a pan bottom Soot is the objective evidence, and it is what tells the difference between a warm color and a real problem. Count the burners affected One is local. All of them is fuel, pressure or a conversion. Find the conversion paperwork If the range has ever changed fuel. Its absence is useful information too. The flame is the wrong color What it usually means Blue is correct — yellow is an air, fuel or orifice problem A bad propane conversion is the leading cause on a relocated range Soot on a pan bottom is the symptom people notice first The one thing to look at before calling One burner or all of them. A single yellow burner is usually a blocked or partly closed air shutter, a dirty orifice or a burner cap sitting slightly off its seat — small, local and cheap. Every burner yellow at once means the fuel or the supply pressure is wrong for the way the range is set, and that is where a propane conversion, a moved range or a new regulator comes into it. Also worth knowing: a brand-new orange flicker for the first minute after lighting on a range that has been idle for weeks is dust burning off and is not this. What it usually means, by the kind of La Cornue appliance La Cornue sells one appliance in several forms, and the same behavior points at different things on each of them. A built-in side-by-side and an integrated column are not the same service situation, and a dual-fuel range and an induction range fail in different halves. Château gas and dual-fuel — Orifices and air shutters are set for the fuel specified at order time, and altitude above 2,000 feet is specified too. CornuFé 90 and 110 dual fuel — La Cornue publishes a conversion procedure and a parts set for these two models specifically. A conversion done without them looks exactly like this. All-induction — No flame at all. Nothing on this page applies. Why this matters beyond the cooking A yellow flame is incomplete combustion, and incomplete combustion produces carbon monoxide as well as soot. On a range with six or eight burners and a gas oven, in a kitchen with the windows shut and the air conditioning on, that is not a cosmetic complaint. It is also the fastest way to ruin cookware and the enamel around a burner. We treat a whole-range yellow flame as a priority call rather than a maintenance one. Propane, altitude and the paperwork La Cornue specifies fuel type at order time and asks about installation above 2,000 feet, and it publishes a conversion procedure with a defined parts set for the CornuFé 90 and 110. What we see is ranges converted with universal kits, ranges converted in part — the fronts done and the plaque burner forgotten — and ranges moved from a propane house to a natural-gas one with nothing changed at all. All three produce this page. Fixing it properly means the maker’s own orifices, every burner set, a leak check, and a written note of what the range is now on. ### The flame has always looked slightly orange. Is that just how it is? No. There is one exception — a soft orange flicker for the first minute on a range that has been unused for weeks, which is dust burning off — and beyond that, a La Cornue burner is a blue flame. If it has looked orange since the day it was installed, that points at the installation: fuel type, orifices or supply pressure never set correctly. It is worth a diagnostic, and on a range this age the fix is usually adjustment rather than parts. ### Could this be why my food tastes odd? It can be, and it is a complaint we take seriously rather than smile at. Unburnt gas has a smell, soot has a taste, and both end up on food cooked over a rich flame — particularly anything grilled directly or cooked on the plaque. A correctly set burner is odorless. If the taste appeared at the same time as the color, they are the same problem. --- **[Read full article: Yellow or orange flame](https://la-cornuemiami.support/symptoms/yellow-or-orange-flame/)**