Induction Cooktop Not Recognizing Cookware

An induction zone heats only when it senses a suitable pan sitting on it. With no pan, or one that is too small, nothing is produced. A CornuFe induction guide says a pan-missing symbol shows in that case, and that a zone switches itself off after 10 minutes without detecting a pan. The Chateau induction display uses a letter for the same condition: U means no pan or an inadequate pan. Neither is a fault. It is the cooktop declining to heat.

The CornuFe guide gives minimum base diameters by zone: 4 3/4 inches for the front left, 5 1/2 inches for the rear left, rear right and front right, and 8 1/4 inches for the center zone. A smaller pan can reduce power or fail to register. On materials, the same guide says copper, aluminum and ceramic pans are not suitable, and that composite aluminum pans with steel inserts should be avoided. It asks for thick, smooth, flat-bottomed pans.

A simple test is whether a magnet clings firmly to the pan base. That is a common household check, not a statement from the manual, so treat it as a clue and not a verdict. Also look at the pan itself. A base that has warped from heat rocks on the glass and loses contact, and a base with raised rings or a heavy residue may sit unevenly.

Center the pan over the marked zone and make sure the glass beneath is clean and dry. Spilled food between pan and glass can interfere with contact. On the Chateau hob, L means the lock is on, so no zone will respond until it is released using the method in your manual. H means residual heat. It is a warning that the surface is still hot, not a fault, and the guide says the surface may stay hot after the indicators go out.

The CornuFe induction guide says E2 means the electronics are too hot, which calls for a check of ventilation or a pan that boiled dry. U400 points to an incorrect connection, and an Er code followed by a number is an internal fault that the owner cannot fix. Repeated fuse or residual-current trips need a qualified repair engineer. The Chateau guide lists E as an electronic failure. Record each code before you clear it.

If a pan worked last week and does not now, think about what changed. A pan base can warp after a boil-dry or after being heated empty, a new pan may be a different material, or the glass may carry a film of residue between pan and surface. Moving a pan slightly off the zone center can be enough to lose detection on a small zone. Pans that sit unevenly can also hum or rattle. Try the same pan on a different zone of adequate size, then try a different pan on the original zone, to find out which of the two is behind the problem.

The CornuFe guide also notes that smaller-than-recommended pans reduce power, so a pan that is just above the cutoff may heat slowly without any message. Matching the pan to the zone is the simplest way to get steady results.

The Chateau guide says to use only a damp cloth for the first cleaning, with no detergent, since detergent can leave a blue tint. Later, use a glass cooktop cleaner as the CornuFe cleaning sheet suggests. Never use paint solvents, caustic or chlorine-bleach cleaners, or coarse abrasives. Switch off the breaker and let the surface cool before a thorough clean.

Induction electronics make heat of their own. The E2 guidance shows that poor ventilation can shut a zone down. Keep the area around the range clear, do not block vents, and avoid leaving an empty pan on a zone. If the hob works for a few minutes and then stops, mention how long it ran and what was cooking, because heat-related behavior leaves a pattern that helps a technician. Let the surface cool, then try one normal start before drawing conclusions.

If you have tried more than one suitable pan on more than one zone, with the lock off and the glass clean, and the same code or no response persists, the cause is probably not cookware. A crack in the glass is a separate matter: the guide says to disconnect power immediately and stop cooking. Do not open the unit to investigate.

Why does my pan work on one zone but not another?

Minimum pan sizes differ by zone, so a pan that is too small for the center zone may still work on a small one.

Can I use a cast-iron skillet?

The guides name copper, aluminum and ceramic as unsuitable. Check your own manual for cast iron, and lift the pan rather than sliding it across the glass.

Is H a problem?

No. It reports residual heat and goes away as the surface cools.

Should I stop with the pan or the knob?

The Chateau guide says to stop with the control knob and not to rely only on pan detection.