Induction zones are available across much of the current La Cornue range, from the ceramic-glass induction elements offered on Château hob configurations to the fully induction versions of the CornuFé 90, CornuFé 110 and CornuFé 90 Duo, and the touch-sensitive induction hob that defines the Castel 60. All of them work the same basic way: the zone generates a magnetic field that only produces heat in cookware with a suitable magnetic base, which is why the most common complaint — “the zone stopped recognizing a pan” — has two very different possible explanations.
The Simple Test
Try a different pan, known to work well on induction, on the same zone. If the second pan is detected and heats normally, the original pan is very likely the problem — an induction-suitable base can warp slightly with age or heavy use, just enough to lose the flat, close contact the zone needs to detect it reliably. If the second pan also fails on that zone, the zone itself is the more likely cause.
What It Means If Several Pans Fail on One Zone
When multiple pans that work fine elsewhere on the hob all fail specifically on one zone, that points at the zone’s coil or its control board rather than at cookware, and it is worth booking a repair rather than continuing to test pans. This is one of the few genuinely electronic troubleshooting paths on a La Cornue hob, and it is diagnosed by testing the zone and board directly rather than by reading any display, since La Cornue has not published an error-code list for these parts.
Cutting Out Mid-Cook Is a Related but Different Sign
A zone that detects a pan and starts heating, but then cuts out partway through cooking, is a related but separate sign from one that never detects a pan at all. Mid-cook cutout is worth describing precisely when you book — how long into cooking it happens, and whether it happens at high or low power settings — since that detail narrows whether the problem is in the zone’s sensing, its power electronics, or a thermal protection feature responding to something else on the hob running hot nearby.
What Does Not Need a Technician
Simply wiping the ceramic-glass surface clean and confirming the pan is centered on the zone’s marked area resolves a surprising number of “detection” complaints on their own, and is worth trying before assuming either the pan or the zone has actually failed.
Reading the Hob’s Own Display
La Cornue’s induction hobs do show a small set of their own symbols, separate from any error-code system. A U on a zone’s display means its pan detector has not found suitable cookware there — it appears whenever a pan is missing, off-center, or unsuitable, not only when something is wrong with the hob — while an H showing after a zone is turned off means that zone is still hot enough to be a burn risk, not a warning of a problem. Neither symbol is a failure alert by itself, but seeing a U with a pan you know works fine everywhere else on that exact zone is useful detail to pass along when you book a repair.
If an induction zone on your La Cornue keeps failing with pans that work everywhere else, a La Cornue cooktop repair visit tests the zone and its control board directly rather than guessing from the sign.