La Cornue Induction Cooktop Repair in San Francisco

An induction module in a La Cornue kitchen is rarely a stand-alone appliance. It sits in a Château cooktop or in a CornuFé range, wrapped in custom cabinetry, fed by a dedicated circuit and watched over by a display that speaks in short codes. When a zone goes cold, a pan is refused or the whole surface shuts itself down, the cause can lie in the pan, the wiring behind the unit, the electronics, or the way the cooker was connected. Our induction cooktop repair in San Francisco and the Bay Area sorts out which, before any part is ordered.

What goes wrong with an induction cooktop

Complaints fall into a few groups, and each points a technician toward a different part of the system.

A zone does not heat, or heats weakly

Induction heats the pan itself through a coil beneath the glass, so a zone that stays cold may have a pan that does not respond to the field, a coil that has failed, a power stage that is not delivering, or a control that is not sending the command. Our post on an induction zone that is not heating walks through what to look at before booking.

The cooktop does not recognize the pan

The display shows a pan symbol or a letter, and the zone refuses to start. Pan detection compares what sits on the glass with what the unit expects. A small pan on a large zone or a warped base can cause it, and so can the detection circuit itself. The full explanation is in induction pan not detected.

The unit switches off by itself

A cooktop that cuts power mid-cooking is protecting something. Restricted cooling airflow, a pan that boiled dry or a weak supply can each trigger it. Read induction cooktop shuts off for the typical patterns.

Reading the display messages

The overview in induction error codes compares them. Five display messages are documented for La Cornue induction hobs, and each has its own page with the meaning and the owner checks that apply.

• E reports an electronic failure on the induction hob display of the Château module.
• E2 means the electronic unit is too hot, and it can also appear if a pan has boiled dry. It is documented for CornuFé induction ranges.
• Er followed by a number is an internal technical fault that the owner cannot rectify.
• U is an indicator that no pan is detected or that the pan is unsuitable for induction. It clears once a suitable pan is placed on the zone.
• U400 says the cooker is incorrectly connected; the control switches off after about a second and the code stays on the display.

How we diagnose

Diagnosis comes before repair. We begin with your description: which zone, what was cooking, what the display showed, and whether the problem began after a power cut, a remodel or a move of the range. The pans in use come next, because an unsuitable pan produces the same symptom as a failed part. After that the technician looks at the supply to the unit, the airflow around the electronics, the state of the glass and controls, and the message history you have noted.

You then receive a written estimate. Nothing is repaired until you approve it.

Installation details that change the diagnosis

A great deal of induction trouble turns out to be an installation question, particularly in houses where the kitchen was rebuilt around the range.

• Dedicated electrical circuit. Induction modules and induction ranges need a supply that matches the unit. A circuit that is shared, undersized or wired incorrectly produces shutdowns, weak output and connection faults.
• Clearance and cooling air. The electronics need air to carry heat away. A module boxed in without clearance, or a drawer stuffed against the underside, can push the unit toward an over-temperature message such as E2.
• Ventilation above. A hood that cannot move enough air leaves steam settling on the surface and the controls; see La Cornue range hood repair.
• Older homes. Many Bay Area houses, from Pacific Heights townhouses to Marin hillside homes, have panels and wiring that predate induction.

Safe checks you can make yourself

These checks are all done from the outside, and none involves opening anything.

1. Look at the breaker for the cooktop or range and confirm it is on and fully seated.
2. Try a different pan, one with a flat base that is suited to induction and sized to the zone.
3. Make sure the glass is clean and dry, and that no cloth, pot lid or foil lies on the surface.
4. Write down the code exactly as it appears, together with which zone you were using.
5. If the display is frozen or confused, switch off at the breaker, leave it off for a short while and switch it back on once. One controlled reset is enough; repeated resetting hides useful information.

When to stop using it

Turn the unit off at the breaker and leave it alone if you notice a burning smell, buzzing that is new, sparks, cracked glass, liquid that has run under the surface, or a code that returns the moment you switch on. A fault that keeps coming back should be examined rather than reset. If the cooktop is part of a range that also has gas burners and you smell gas, leave the house, avoid switches and call the gas utility or 911 from outside.

Why the model number matters

La Cornue builds in small numbers, and parts are specific to the brand and to the series. A Château induction hob module and a CornuFé induction range do not share the same display behaviour, and the codes listed above apply differently to each. The model and serial plate usually sits behind a lower door or drawer, or on the frame behind the oven door on a range, and under the front edge of a separate cooktop. If you cannot find it, read how to find the La Cornue model number.

Two induction-capable ranges appear in our lineup: the CornuFé 110, a 43 inch range offered as gas or induction, and the CornuFé 90, a 35.4 inch range offered as gas, dual fuel or induction.

How a visit runs

You send us the model, the code and a short description through the contact form or by phone. We confirm the address and access, which matters on hillside streets and at gated estates. The technician examines the unit, tests it, and explains what was found in plain language. You receive a written estimate. If you approve it, the repair proceeds; if not, the cooktop is left as we found it.

Where to read more

The guide to La Cornue induction cooktops describes the lineup and the typical complaints for each. Owners of an induction range may also want CornuFé range problems.

Frequently asked questions