--- title: "Bertazzoni induction cooktop showing ER21" description: "What ER21 means on Bertazzoni induction cooktops, what to check before booking, and when it is not a failure at all." url: "https://cooktoprepair.center/error-codes/bertazzoni-er21/" --- # Bertazzoni induction cooktop showing ER21 A temperature sensor under the touch interface has read more than 85 °C (185 °F), and the cooktop shuts down completely. ## What ER21 actually means. A temperature sensor under the touch interface has read more than 85 °C (185 °F), and the cooktop shuts down completely. Bertazzoni gives two routes to it: a hot pan or lid set down on the interface, and heat building up under the controls. Bertazzoni cooktop display What to do when ER21 shows on the cooktop ### Kind of code Temperature and overheat sensors A sensor under the glass or on a board reported a reading the control rejected, or heat climbing past the safe limit — often after an empty pan was left on a zone. The zone is allowed to cool and a loose sensor plug is ruled out before the sensor, the coil assembly or the board is blamed. A top that keeps getting hotter is switched off at the breaker first. ### Usually leads to Induction board and coil repair Induction zones that stop sensing pans, cut out, buzz or show codes, traced to the power boards, the coils, their sensors and the links to the controls. ### Shows up as Cooktop Controls Unresponsive Touch keys or a slider do nothing, the display lights but ignores every press, or a knob turns without starting its burner or element. ### Make Bertazzoni An Italian maker whose US catalog lists drop-in gas cooktops, induction cooktops and pro-style rangetops. ### Source Bertazzoni TFT induction cooktop user manual (PE304T*, PE365T*) Bertazzoni induction cooktops with the TFT display interface, models PE304T* and PE365T*. The XV series and the induction downdraft cooktop have manuals of their own, which were not read for this code. ## Before you book, in this order. Each step comes from Bertazzoni's own guidance for ER21 on its cooktops. Follow it to the end: the last card says whether this is a visit. 01 Take any hot pan or lid off the control area and let the cooktop cool. 02 Switch it on again once it has cooled; Bertazzoni says the code clears when the temperature drops back down. 03 If ER21 keeps returning without anything hot on the controls, book a visit so the insulation and cooling under the interface can be checked. ### Still there? It usually turns into [induction board and coil repair](https://cooktoprepair.center/services/induction-board-and-coil-repair/). Book with the code and the model number. ### What not to do ER21 does not mean a cooking zone has failed. It is about the temperature at the control strip, not the coils under your pans. ## What you may notice with it. The cooktop problems ER21 tends to arrive with. Answer these at the cooktop before anyone is booked. [All problems](https://cooktoprepair.center/problems/) Before you call ### [Cooktop Controls Unresponsive](https://cooktoprepair.center/problems/cooktop-controls-unresponsive/) [All 5 causes, cheapest first](https://cooktoprepair.center/problems/cooktop-controls-unresponsive/) It also comes with - [**Cooktop Error Code**](https://cooktoprepair.center/problems/cooktop-error-code/) Problem ### Cooktop Controls Unresponsive 5 causes, cheapest first Where ER21 usually leads ## Induction board and coil repair. **Induction power board, coil or sensor · moderate to highest.** Book a visit [What the job involves](https://cooktoprepair.center/services/induction-board-and-coil-repair/) ## Bertazzoni cooktops. An Italian maker whose US catalog lists drop-in gas cooktops, induction cooktops and pro-style rangetops. [Bertazzoni cooktop repair](https://cooktoprepair.center/brands/bertazzoni/) More Bertazzoni codes [ER03](https://cooktoprepair.center/error-codes/bertazzoni-er03/) [E2](https://cooktoprepair.center/error-codes/bertazzoni-e2/) [U400](https://cooktoprepair.center/error-codes/bertazzoni-u400/) [L](https://cooktoprepair.center/error-codes/bertazzoni-l/) [A](https://cooktoprepair.center/error-codes/bertazzoni-a/) Temperature and overheat sensors on other makes [BlueStar E2](https://cooktoprepair.center/error-codes/bluestar-e2/) [Bosch F1](https://cooktoprepair.center/error-codes/bosch-f1/) [Dacor C0](https://cooktoprepair.center/error-codes/dacor-c0/) [Fulgor Milano E2](https://cooktoprepair.center/error-codes/fulgor-milano-s700-e2/) [Gaggenau F1](https://cooktoprepair.center/error-codes/gaggenau-f1/) [JennAir E2](https://cooktoprepair.center/error-codes/jennair-e2/) [KitchenAid E_9](https://cooktoprepair.center/error-codes/kitchenaid-e-9/) [Maytag C82](https://cooktoprepair.center/error-codes/maytag-c82/) [All 53 codes of this kind](https://cooktoprepair.center/error-codes/#family-sensor) Bertazzoni builds this ### Gas cooktop A gas cooking surface dropped into a countertop cutout, with its gas line and power cord running down into the cabinet underneath. Bertazzoni builds this ### Induction cooktop A glass cooktop in the counter that heats the pan itself through magnetic coils, run by power boards and cooled by a fan underneath. Bertazzoni builds this ### Rangetop A pro-style gas cooking top with its knobs across the front, set into a notch above a base cabinet, often with a griddle or char-broiler beside the burners. ## In Bertazzoni's own words > the user interface has detected a temperature >85°C [Bertazzoni TFT induction cooktop user manual (PE304T*, PE365T*)](https://us.bertazzoni.com/downloads/14077/11179/11164_user-manual-TFT-induction-cooktops-NA_2_1.pdf) [Bertazzoni TFT induction cooktop user manual (PE304T*, PE365T*)](https://us.bertazzoni.com/downloads/14077/11179/11164_user-manual-TFT-induction-cooktops-NA_2_1.pdf) [Bertazzoni TFT induction cooktop user manual (PE304T*, PE365T*)](https://us.bertazzoni.com/downloads/14077/11179/11164_user-manual-TFT-induction-cooktops-NA_2_1.pdf) Every code on this site is taken from the manufacturer's documentation, never from a forum or a parts listing. Bertazzoni induction cooktops with the TFT display interface, models PE304T* and PE365T*. The XV series and the induction downdraft cooktop have manuals of their own, which were not read for this code. ## Bertazzoni ER21 cooktop repair, where we come out. The same visit in every metro below: the code, the model number, and a diagnosis before any part is ordered. 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Take any hot pan or lid off the control area and let the cooktop cool. If it comes back, it needs a visit. ### Why does ER21 appear when I slide a hot lid toward the front of my Bertazzoni cooktop? The lid heats the glass over the touch interface, and the sensor there shuts the cooktop down past 185 °F. Park lids and hot pans away from the control strip. ### How long should I wait after ER21 before switching the cooktop back on? Until the control area has cooled; Bertazzoni ties the restart to the temperature falling below 185 °F. If the code appears again on a cool cooktop, book a visit. ### Why does my Bertazzoni PE365T show ER21 when nothing hot is near the keys? The manual gives a second route to ER21: heat building up under the controls rather than an object sitting on top. When the code shows with the control strip clear, the cooling and insulation beneath the interface are what a technician looks at. Book a visit if it keeps happening. --- **[Read on the site: Bertazzoni induction cooktop showing ER21](https://cooktoprepair.center/error-codes/bertazzoni-er21/)** **[Book a visit with CooktopRepair.center](https://cooktoprepair.center/schedule/)**