A La Cornue tells you what is wrong through how it heats and how its pilots behave, not through a code. These hand-built ranges do not display numeric faults, so we diagnose from the symptom and the burner behavior. Here are the patterns we see and what each one points to on a Chateau or CornuFe.
| Symptom | Likely Cause | What We Do |
|---|---|---|
| Vaulted oven slow to reach temperature | Capillary thermostat or the gas valve | Test the thermostat bulb and replace the valve if needed |
| Burner or oven pilot will not light | Weak thermocouple or the spark module | Replace the thermocouple and clean the pilot assembly |
| Uneven heat across the oven | Burner or heat-deflector position | Realign the burner and service the deflector |
| Pilot lights but will not stay lit | Thermocouple not holding the valve open | Replace the thermocouple and adjust the pilot flame |
A vaulted oven that is slow to reach temperature usually points to the capillary thermostat or the gas valve rather than the burner itself. A pilot that lights and then dies is the other common one, and it is almost always a thermocouple that has weakened past the point of holding the valve open, a wear part that we replace and then confirm the pilot stays lit.
Every symptom above is a starting point, not a verdict. On a La Cornue we confirm the cause with a live test before quoting, so you are never paying for a part on a guess, and the models we see most in Chestnut Hill kitchens are the Chateau series, the CornuFe 90, the Grand Palais 180, and the Flamberge rotisserie.
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We diagnose the unit, explain what failed, and quote it in writing. Diagnostic and travel fees, if applicable, are confirmed before the appointment and before repair approval.