La Cornue Range Top U
La Cornue Range Top U is a fault our factory-trained technicians diagnose and repair with genuine parts. Below is what it means, the most likely causes, and the steps to try before booking service.
What "U" Flashing (Induction Module) means on your La Cornue Range Top
On a La Cornue range-top with an induction module, a flashing “U” means the pan detector sees no compatible cookware on that zone. Induction needs ferromagnetic cookware. If a good pan still shows “U” on one zone while others work, that zone’s coil or sensor may be faulty.
Symptoms to look for
The signs below help confirm you are dealing with this condition rather than a different fault. You may notice just one of them or several together, and they can appear gradually over time or suddenly after a spill, a power event, or recent service.
- Zone flashes “U” and will not heat
- No power until a suitable pan is placed
- Other zones operate normally
- Persists with confirmed induction cookware
Common causes
Several different faults can produce these symptoms. Working through the most likely causes in order helps you separate a quick, inexpensive fix from a problem that needs trained service and the correct La Cornue parts.
- Non-magnetic/undersized pan — cookware unsuitable for induction
- Off-center pan — not over the coil
- Coil/sensor fault — single-zone detection failure
- Debris — material between pan and glass
Troubleshooting steps you can try
Work through these checks in order, with the appliance cool and powered down before you touch any internal part. Stop at any point where you are unsure, or where gas, high heat, or live electrical parts are involved, and hand the remaining diagnosis to a qualified technician.
- Use cookware a magnet sticks firmly to, centered on the zone.
- Test the pan on another zone to localize.
- Clean and dry glass and pan base.
- Match pan size to the zone marking.
When to call a technician
If a confirmed induction pan still shows “U” on one zone while others work, that zone’s coil/pan-detector needs a technician. Otherwise it is a cookware/placement issue. You can reach the La Cornue National Service Center on 1-877-522-6768, or find an authorized technician through the manufacturer at lacornueusa.com. La Cornue appliances are hand-built and use proprietary parts, so factory-trained service protects both your warranty and the appliance.
Parts a technician may replace
Depending on what the diagnosis shows, a technician may inspect, test, or replace the pan detector, induction coil, and ceramic glass. The correct part for your configuration is identified from the model and serial number; on La Cornue appliances these are proprietary components fitted by trained service rather than generic substitutes, which protects both performance and the appliance’s long-term value.
Safety and prevention
To reduce the chance of this returning on your La Cornue Range Top, keep up with routine care — clean spills before they bake on, follow the manufacturer’s maintenance schedule, and avoid abrasive pads or harsh chemicals on enamel, brass, and finished surfaces. Protect the electronics with a stable, correctly rated supply, and note any code exactly as displayed before resetting. When you book service, having the model and serial plate details and a note of exactly what you observed will help the visit go quickly. A clear description of when the problem started and what you were cooking at the time often points the technician straight to the cause.
Need help now? Book a certified technician on our schedule page, explore more La Cornue range top error codes, or see full La Cornue range top repair options.
