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E04 on the display
A common version of this story starts at the kitchen store. The new stainless set looks great, you place the first pan on the zone, press a heat level and the display flashes E04 while the zone stays cold. The old skillet in the cupboard works without complaint. That contrast is the single best clue, because it moves the question from the cooktop to how it senses what sits on the glass. Pan detection is the zone checking whether cookware is present before it sends power to the coil.
Why the exact model matters
On induction models, a zone only energizes when it detects a suitable pan, and the code table that reports a detection problem differs between control generations. We therefore treat E04 as model-dependent: it often relates to what the zone sees, but the model number and the behavior must support that before anything is replaced. A code that follows one pan around is about the pan, while one that stays on a single zone is about that zone.
Assemblies looked at first
If the pan is ruled out, the first assemblies are the detection circuit for that zone, the coil underneath it and the connector between the coil and the board. A coil that shifts or a connector that has lost contact can make good cookware look wrong, particularly on a cooktop that has been in use for years. The induction coil is the flat winding under the glass that heats the pan by magnetic action.
Safe checks from the outside
- Hold a household magnet to the base of the new pan. If it does not grip firmly, the pan is not suited to an induction zone.
- Center the pan on the zone marking and check the base is flat, without a dome from heating.
- Try the pan on a different zone and the old pan on the zone that complained.
When it becomes a technician job
When E04 appears with several pans that clearly work elsewhere, or on a zone that used to work, the detection side needs measurement under the glass. A technician tests the coil and the board’s detection response with known cookware, so a replacement is based on a result and not on a guess.
A detail worth knowing
Pan size matters too, since a base much smaller than the marked circle can be read as no pan at all. A tiny milk pan on the largest zone is a typical cause.
Another thing that fools the zone is a layer between the pan and the glass, such as a silicone trivet, a sheet of foil or a thick mat. Keep the base of the pan directly on clean, dry glass. If a pan only fails when full of cold water, try it again once it has a little heat, and report both results. Both results help show whether detection or heating is failing.
Frequently asked questions
Yes. Pans that are not magnetic or are too small for the zone can fail detection. That is why we test a known good pan.
Look for cookware that a magnet grips on its base. Flat bottoms in cast iron, enameled steel and magnetic stainless are common choices.
When E04 appears with several cookware pieces that work on other zones, or when a zone that used to work has stopped.
Model compatibility: Bertazzoni reuses codes across series and model years, so E04 may mean something different on another appliance or generation. Confirm this against your model’s documentation and record your full model number before acting.
