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What you will notice
Woks, round-bottomed pans and pans with a rough or ridged base do not sit flat on the glass. Some owners use a ring to hold a wok upright, and that ring raises the pan. A zone may then struggle to read the load, flashing E29 or cutting out partway through a cook. Induction needs the pan base close to the coil so the zone can detect and heat it, which is why pan detection is the first thing a rough or raised base disturbs. Flat-bottomed woks designed for induction tend to behave better than a round one on a ring.
Checks you can do yourself
- Try a flat-bottomed pan or a flat induction wok to see whether E29 follows the pan style.
- Remove the ring and check that nothing metal other than the pan sits on the glass.
- Look for scratches or marks on the zone that might point to a rough base dragged across it.
Where the work starts inside the cooktop
If a flat, magnetic pan also gives E29, the first assemblies are the coil, the sensor beside it and the connection to the board. A sensor that has shifted, or glass that has been marked by sliding a rough base, can alter what the zone reads. Looking at a marked zone only shows surface wear, since the coil and sensor sit beneath the glass and are tested by measurement.
What the code does and does not tell us
E29 is not confirmed as having one meaning across every Bertazzoni cooktop. For zones that read cookware, poor contact is one plausible trigger, and for other designs the same code means something else. The model number and a test with a flat pan sort out which applies.
Scratches from sliding pans can hold residue that burns on later. Lifting pans instead of dragging them keeps the glass in better shape.
A wok ring that sits on a gas grate is common in homes that switched from gas to induction. The ring was not meant for glass, and its feet can scratch it. If you have changed cooktop types recently, ask what accessories suit the new surface before you cook on it.
When to book a visit
If E29 appears with plain flat pans too, a technician should check the zone sensing. That requires opening the cooktop to measure live parts, and it is not an owner job. If it only appears with the wok and ring, the visit is likely to confirm cookware contact as the cause, and we say so.
Frequently asked questions
A flat-bottomed or specially shaped wok works better. Round woks on rings can give poor contact.
Metal feet can scratch it. Avoid sliding and check for marks.
If flat magnetic pans also trigger it, the zone is the suspect.
Model compatibility: Bertazzoni reuses codes across series and model years, so E29 may mean something different on another appliance or generation. Confirm this against your model’s documentation and record your full model number before acting.
