La Cornue NG to LP Propane Conversion
La Cornue NG to LP Propane Conversion is a common question among La Cornue owners. This guide walks through it step by step with technician-grade detail.
La Cornue gas and dual-fuel ranges are configured for either natural gas (NG) or liquid propane (LP). If your home runs on propane, the range must be converted. This guide explains what conversion involves and why it is a job for a licensed professional.
Why conversion is necessary
Natural gas and propane burn at different pressures and energy densities. Propane requires smaller burner orifices and a different pressure regulator setting to deliver a safe, correct flame. Running an NG-configured range on propane produces oversized, sooty flames and is dangerous; running an LP-configured range on natural gas produces weak, lifting flames.
What gets changed
- Burner orifices (jets): Replaced with the propane-spec orifices for each burner, including the high-BTU front burners.
- Oven orifice: Swapped for the gas oven burner.
- Pressure regulator: Adjusted or set to the LP position.
- Air shutters: Tuned so the flame burns blue, not yellow. A yellow flame indicates improper air-fuel mix — see our yellow flame guide.
Use the correct conversion kit
La Cornue supplies model-specific LP conversion kits. Using the wrong orifices is unsafe and can damage the range. Confirm the correct kit for your model with the National Service Center (1-877-522-6768) or on lacornueusa.com.
Why a professional must do it
Gas conversion involves disassembling burners, handling gas connections, setting regulator pressure, and leak-testing — all governed by safety codes. Improper conversion risks gas leaks, fire, and carbon monoxide. A licensed technician verifies flame quality and performs a leak test on completion.
After conversion
Once converted, check that all burners ignite reliably and burn blue, and that the oven reaches temperature. If you notice ignition trouble afterward, see our range won’t light checklist.
Schedule a professional conversion
Conversion costs vary by model and number of burners, typically from a modest parts-and-labor figure. Our certified technicians perform NG-to-LP conversions with the correct kits and full leak testing. Schedule a conversion appointment to do it safely.
How to tell a conversion is needed or wrong
The flame tells the story. An NG-configured range run on propane produces oversized, sooty, sometimes lifting flames; an LP-configured range on natural gas produces weak, undersized flames that may not stay lit. After any conversion the flames on every burner should settle into a steady, clean blue. Yellow or orange tips signal an air-mix problem that still needs tuning — see our yellow flame guide. If you have just moved into a home with an existing La Cornue, confirm which fuel it is set for before lighting it.
Keep records for warranty and resale
Note the conversion in your records, including which model-specific kit was used and the regulator setting. This matters for future service, for warranty (an improper DIY conversion can void coverage), and for resale. Always use the genuine La Cornue kit matched to your model — the orifices are model-specific, and substitutes are unsafe.
Frequently asked
- Can I convert it back later? Yes, with the appropriate kit and a professional — the process reverses.
- Does conversion affect the oven too? Yes — the oven burner orifice is changed along with the surface burners.
Why this is strictly professional work
Gas conversion involves disassembling burners, swapping model-specific orifices, setting the regulator to the LP position, tuning air shutters for a clean blue flame, and handling and leak-testing the gas connection — all governed by safety codes. Done improperly it risks gas leaks, fire, and carbon monoxide, which is why a licensed technician must perform it and verify the result. After conversion, confirm every burner ignites reliably and burns blue and the oven reaches temperature; if ignition trouble appears afterward, work through our range won’t light checklist.
