--- title: "La Cornue oven symbols, hob indicators and the only three error codes this make has." description: "La Cornue oven symbols and hob indicators explained — H, the pan symbol, L, A, P — plus the only three error codes this make publishes." url: "https://la-cornuemiami.support/error-codes/" date_modified: "2026-09-04" --- # Error codes archive ## La Cornue oven symbols, hob indicators and the only three error codes this make has. This is the shortest code archive on our fleet and the honest length for this make. La Cornue publishes three error codes in the whole of its US documentation — E2, U400 and Er with a number — and all three are on the induction hob. What its guides do document is nineteen conditions described in words, and those are here too, each one quoted from the guide it came from. 3 — error codes in the entire make 19 — conditions the maker documents in words 20 — pages carrying a verbatim quotation ## Every code, indicator and documented condition Three of these are error codes and nineteen are conditions the maker's own guides describe in words. Filter by appliance first: the codes belong to the induction and all-electric models and cannot appear on a gas range at all. Twenty of the twenty-two pages here carry a verbatim quotation from a La Cornue installation or user guide, and each names the document. The two that do not are paraphrased on purpose: our own style rules forbid a word the maker uses, and editing a quotation to pass a linter is worse than not quoting. A script checks every quotation against the archived PDFs — the first time it ran it caught three misquotations of ours, including a lamp voltage taken from the wrong one of two guides that disagree. ## A make with three codes gets three code pages The Château installation and user guide has no troubleshooting section. Neither does the Château Tourelle guide. The only place a code is printed anywhere in La Cornue’s US documentation is the CornuFé induction guide, and it prints three: E2, U400 and Er with a number. A sibling network once published about 38 invented codes for another brand — symptoms dressed up as codes — and that is the specific thing this archive refuses to do. Where the maker says nothing, this site says that the maker says nothing. ## Most of what a La Cornue display shows is information H is residual heat above 140 °F. The pan symbol means no pan, or a pan too small for that zone. A is automatic heat-up, L is child lock, L1 and L2 are the low and simmer settings, P is power boost. None of those is a problem, and an L switched on by a child accounts for a fair share of industry-wide calls about dead cooktops. Reading the display correctly is free, and it is occasionally the whole visit. ## What to establish first Which half of the line you have - Gas Château, gas rangetop, vaulted gas oven: no display, no code, nothing stored. - Induction cooktop or rangetop, electric or multifunction oven, digital hood: codes possible. - An all-induction Château always has electric ovens — that is a rule of the order form. - A CornuFé with an -I suffix is the induction version. Whether it is a code or an indicator - Codes: E2, U400, Er with a number. That is the complete list. - Indicators: H, the pan symbol, A, L, L1, L2, P. - An H on a zone you have just used is the hob telling you it is still hot. - Write an Er number down exactly — Er 3 and Er 30 are different messages. What changed recently - A latched U400 almost always follows work on the panel, the circuit or the range itself. - E2 under load points at ventilation; E2 from cold points at the unit. - No display at all is attributed by the maker to over-voltage or lost supply. - A device that trips repeatedly is tested rather than reset. ## Then the behavior is the way in With three codes in the whole of this maker's documentation, the twenty-one symptom pages carry the diagnosis that a code archive carries on other makes. ## No display is not a symptom Every gas Château, every gas rangetop and both vaulted gas ovens publish nothing — no code, no display, no stored history — and that is normal for this make rather than a sign the electronics have died. An oven that will not light is diagnosed with a clamp meter on the igniter circuit, a millivolt reading across the flame supervision and a functional test on the safety valve. [Start from what the appliance is doing](/symptoms/). ## Questions about codes and indicators What does E2 mean on my La Cornue? — The electronic unit under the induction hob is too hot, and it has shut the zones down to protect itself. The maker's own guide gives two causes in this order: the installation of the cooker and whether there is sufficient ventilation, and then — in extreme cases — a cooking utensil allowed to boil dry. So the first thing to look at is what is packed into the cabinet under the cooktop, not the price of a board. What we will not do is clear it and hand the range back, because repeated overheating destroys the board the code is protecting. I have a U400 and the hob will not run at all. — U400 is the maker's own wording for a cooker that has been incorrectly connected. The control switches off after about a second and the code then stays on the display permanently by design, so there is nothing to reset. In practice it turns up after something changed — a new installation, a breaker or panel replaced, the range moved, electrical work in the kitchen — and it is one of very few messages here where the honest answer may be that nothing inside your range is broken. My range shows nothing at all. Is the control dead? — Probably not, and on a gas Château there is no control to be dead: those ranges have no display and never did. On an induction hob, a completely dead display is attributed by the maker's own guide to over-voltage or loss of supply voltage — so the checks are the breaker, the isolating switch and the supply, upstream of the appliance. Worth ruling out before anybody books anything. Why are there only three codes when other brands have dozens? — Because that is what La Cornue publishes. Most of this line is mechanical: brass valves, thermocouples, safety valves, an igniter, a thermostat, a cast-iron plate. There is no control board on a gas Château to raise a code, and the company's own Château guide contains no troubleshooting section at all. A longer list on this site would mean we had made one up. ## How to read a La Cornue display, and what to do when there is not one ### The three codes, in the maker’s own words **E2** — the electronic unit is too hot; check the installation of the cooker and whether there is sufficient ventilation, and note that a utensil boiled dry can also produce it. **U400** — the cooker has been incorrectly connected; the control switches off after about a second and the code is then permanently displayed. **Er** followed by a number — an internal problem the user cannot put right, which means a technician rather than a reset. That is the complete published set, and every one of the three belongs to the induction electronics. ### The indicators, which are not codes The hob display also shows H for residual heat above 140 °F, a pan-missing symbol when a zone has no pan or a pan below its minimum base diameter, A for automatic heat-up, L for child lock, L1 and L2 for the low and simmer settings, and P for power boost. Those are the oven and hob symbols people actually search for, and none of them means anything has failed. The published minimum pan bases are 4¾ inches at the front left, 5½ at the rear zones and 8¼ at the center. ### And the nineteen conditions the guides describe in sentences No display at all, a fuse or residual-current device tripping repeatedly, a hob that will not switch on, a crack in the hob surface, scratches, pan noise, a burner that dies when the knob is released, burners that will not light after cleaning, an excessively hot fascia pointing at a failed cooling fan, hot knobs, steam at the rear grille, a noisy oven fan, an oven not coming on, an oven getting hotter as the range ages, uneven cooking, food cooking too slowly, and the oven lamp. Each one is published here under the maker’s own description, with the guide it came from named on the page — because a documented condition is worth more than an invented code. ## A code, or nothing at all — either way, tell us the model. Photograph the display if there is one and write an Er number down exactly. On a gas range the model code and the configuration are worth more than any display would be. --- **[Read full article: Error codes archive](https://la-cornuemiami.support/error-codes-archive/)**