La Cornue stoves are gas at heart, so most do not display a coded error — they tell you something is wrong through how the burners and oven behave, and diagnosis is done by reading those physical signs rather than a screen. The faults we see most often on a hand-built stove are a burner that will not ignite from clogged ports, a clicking igniter that never catches (usually a wet, dirty, or cracked electrode), and a yellow or flickering flame that points to a poor air-to-gas mixture, frequently after an LP/NG conversion where the wrong orifice or air-shutter setting was left in place.
How La Cornue stove faults are diagnosed
Inside the oven, a weak glow-bar igniter that lights but no longer draws enough current to open the gas safety valve will leave the cavity cold — which is why a technician measures amp draw rather than judging the glow. Temperature drift is read against a reference thermometer and traced to thermostat calibration or a worn dial. A stiff burner knob, chipping vitreous enamel, tarnished brass trim, and a pilot or safety valve that will not stay open round out the routine stove call.
Safety signs and persistent trips
If you ever notice a gas smell, treat it as urgent: ventilate, stop using the appliance, and call for service. A hi-limit safety thermostat that keeps tripping (part reference 06ELTS01) lights a red indicator and is reset or replaced only after the overheat cause is found, never blindly. Because every stove is configured individually, the correct orifice, valve, and igniter are matched to the build, and an LP/NG conversion is verified end to end before the stove is returned to service. Chipped vitreous enamel and tarnished brass trim are addressed at the same visit so the repair leaves the appliance looking as it should. For a persistent fault, our technicians diagnose and repair with genuine parts — book a stove repair (from $X) or browse the full model lineup to confirm your configuration first.