La Cornue ranges span pure gas, dual-fuel, and full induction, so they report problems either as physical symptoms or as electronic codes — and a proper diagnosis starts by learning which build you have. On gas and dual-fuel Château and CornuFé ranges, the usual signs are a surface burner that fails to ignite, a weak or burned-out bake igniter, oven temperature drift, uneven baking, and a convection fan that grows noisy or stops. These are gas diagnostic indicators, read by hand and meter rather than by code.
How La Cornue range faults are diagnosed
Dual-fuel and induction ranges add electronics that surface real codes. An induction top flashes a U when no compatible ferrous pan is detected — if the right pan is present and other zones work, the coil or sensor has failed. It cuts out with E2 when the electronics overheat or a pan boils dry, shows U400 for an incorrect supply connection (a wiring fault that shuts the unit off for about a second while the code stays), and an Er message signals an internal control fault that needs service. The H indicator simply means a zone is still hot.
Hardware faults on larger models
A hi-limit thermostat that keeps tripping (06ELTS01), a control-board lockout, a door that will not seal, catalytic panels that no longer self-clean, or a misaligned warming drawer on the larger Château 165 and Grand Palais 180 all call for a technician with the correct part. Because each range is built to order, we match igniters, valves, elements, coils, and boards to your exact configuration rather than reaching for a generic substitute, and a dual-fuel range is checked on both its gas and electric circuits so a fault on one side is not mistaken for the other. Book a La Cornue range repair (from $X), or confirm your build in the model lineup before we arrive.