--- title: "La Cornue cooktop error code Er" description: "La Cornue cooktop error code Er: The La Cornue Er code — Er followed by a number — is the only one on this make that points straight at the" url: "https://la-cornuemiami.support/error-codes/er/" date_modified: "2026-09-04" Appliance type: "Cooktops and rangetops, Ovens, Ranges" --- # La Cornue cooktop error code Er ### What Er means, in the maker’s own words The La Cornue Er code — Er followed by a number — is the only one on this make that points straight at the appliance’s own electronics. La Cornue’s guide describes it as an internal technical problem that cannot be rectified by the user and directs the owner to their installer or a qualified repair engineer — there is no reset sequence, no user-clearable state and no published list of what each number means. That last point matters: the number is diagnostic information for a technician with the appliance in front of them rather than something to look up, so write it down exactly as it appears before the display is cleared. ### Where this code actually appears On the induction hob’s own display, and nowhere else. Most of this appliance cannot tell you anything at all: the vaulted gas oven has no window and no display, the gas top is mechanical valves behind brass knobs, and the Château install and user guide contains no troubleshooting section. All three of the codes La Cornue publishes anywhere — this one, U400, and Er followed by a number — appear in the induction sections of its guides and on the induction panel. Photograph what the hob shows before cutting the power: a reset erases it, and on a make this quiet the code is most of the diagnosis. ### Which machines this one applies to La Cornue induction cooktops and rangetops, and the electric and multifunction ovens. La Cornue publishes three codes in the whole of its US documentation and its Château guide carries no troubleshooting section, so a behavior missing from this archive is not proof that your appliance cannot do it — the maker simply never wrote a table for it. What its guides do document, they document in sentences, and those are on this site under the maker’s own wording. The model number, and which top the range was ordered with, settle what any of it means. ### What to do about it - Write the number down exactly. Er 3 and Er 30 are not the same message and the display may not show it again. - Note which zone or which oven, and what was running at the time. - Do not expect a reset to help. The maker’s own text is that this is not something the user can put right. - Have the inputs measured before a board is quoted — supply, sensors and loads. A control condemned with a failed sensor still attached fails again in a week. - Ask for the lead time up front. On a hand-built appliance a control can ship from France, and that belongs in the conversation before the order. ### Where this goes next The job this usually becomes is [appliance control board repair](/services/appliance-control-board-repair/), and every one of those pages carries a starting figure and the reasons that move it. If it turns out to be nothing — and on this make a real share of these are modes rather than problems — the visit ends there and you pay the diagnostic and nothing else, or call [(305) 614-3699](tel:+13056143699) and describe what the display is doing before booking anything. La Cornue induction cooktops and rangetops, and the electric and multifunction ovens What this one means What Er means, in the maker’s own words The La Cornue Er code — Er followed by a number — is the only one on this make that points straight at the appliance’s own electronics. La Cornue’s guide describes it as an internal technical problem that cannot be rectified by the user and directs the owner to their installer or a qualified repair engineer — there is no reset sequence, no user-clearable state and no published list of what each number means. That last point matters: the number is diagnostic information for a technician with the appliance in front of them rather than something to look up, so write it down exactly as it appears before the display is cleared. Where this code actually appears On the induction hob’s own display, and nowhere else. Most of this appliance cannot tell you anything at all: the vaulted gas oven has no window and no display, the gas top is mechanical valves behind brass knobs, and the Château install and user guide contains no troubleshooting section. All three of the codes La Cornue publishes anywhere — this one, U400, and Er followed by a number — appear in the induction sections of its guides and on the induction panel. Photograph what the hob shows before cutting the power: a reset erases it, and on a make this quiet the code is most of the diagnosis. Which machines this one applies to La Cornue induction cooktops and rangetops, and the electric and multifunction ovens. La Cornue publishes three codes in the whole of its US documentation and its Château guide carries no troubleshooting section, so a behavior missing from this archive is not proof that your appliance cannot do it — the maker simply never wrote a table for it. What its guides do document, they document in sentences, and those are on this site under the maker’s own wording. The model number, and which top the range was ordered with, settle what any of it means. What to do about it Write the number down exactly. Er 3 and Er 30 are not the same message and the display may not show it again. Note which zone or which oven, and what was running at the time. Do not expect a reset to help. The maker’s own text is that this is not something the user can put right. Have the inputs measured before a board is quoted — supply, sensors and loads. A control condemned with a failed sensor still attached fails again in a week. Ask for the lead time up front. On a hand-built appliance a control can ship from France, and that belongs in the conversation before the order. Where this goes next The job this usually becomes is appliance control board repair, and every one of those pages carries a starting figure and the reasons that move it. If it turns out to be nothing — and on this make a real share of these are modes rather than problems — the visit ends there and you pay the diagnostic and nothing else, or call [(305) 614-3699](tel:+13056143699) and describe what the display is doing before booking anything. --- **[Read full article: La Cornue cooktop error code Er](https://la-cornuemiami.support/error-codes/er/)**