The La Cornue vaulted “voûte” oven cooks by radiant heat inside a sealed dome with no window on the Château, and its faults follow directly from that design. On gas vaulted ovens the most common issue is a weak glow-bar igniter that will not open the safety valve, leaving the oven unable to ignite or reach temperature; because there is no fault code on a gas cavity, this is diagnosed by measuring igniter amp draw and checking the safety valve, not by guessing from the glow.
How La Cornue oven faults are diagnosed
Temperature drift and uneven cooking from radiant hot spots are typical and usually trace to thermostat calibration or a worn dial, which we verify against a reference thermometer. A pilot or safety valve that will not stay open, a heat-losing door gasket, a failed light socket, and a degraded catalytic liner are the other routine gas-oven indicators. None of these announce themselves with a screen code — they are read from how the oven behaves.
Electric and multifunction vaulted ovens
Electric and multifunction vaulted ovens — including the seven-mode CornuFé convection oven — add a bake element, a convection element and fan, and a control board, any of which can fail. These electronic cavities can display an Er code for an internal technical fault that needs service, alongside non-coded electronic issues such as a hi-limit thermostat trip (06ELTS01, with its red indicator), a convection fan fault, or an open or shorted sensor. Because the vaulted oven is a hand-built brass-and-enamel assembly, repairs deserve genuine parts and a careful technician, and on the larger Château 120, 150, 165, and Grand Palais 180 — which carry both a gas and an electric vault — each cavity is diagnosed separately so the right fault is fixed in the right oven. Schedule a vaulted oven repair (from $X), or check your model in the lineup.