--- title: "Bertazzoni induction cooktop showing U400" description: "What U400 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-u400/" --- # Bertazzoni induction cooktop showing U400 U400 is Bertazzoni's wrong-connection code: the manual describes an incorrect 400 V connection that does not suit the power board. ## What U400 actually means. U400 is Bertazzoni's wrong-connection code: the manual describes an incorrect 400 V connection that does not suit the power board. In a US kitchen it points to the wiring at the junction box feeding the cooktop, not to a cooking setting. Bertazzoni cooktop display What to do when U400 shows on the cooktop ### Kind of code Induction power and coils An induction zone could not drive its coil as the board planned: no pan was detected, the current ran too high or too low, or the power stage reported trouble. The pan base, the supply voltage and a clogged air intake are checked before the coil or the power board is replaced, and a top that trips its breaker is left switched off until then. ### 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 U400 on its cooktops. Follow it to the end: the last card says whether this is a visit. 01 Switch the cooktop off at the breaker and leave it off. 02 Do not open the junction box or touch the cooktop's supply wiring yourself. 03 Do not keep resetting it. Book a visit so the supply wiring and the cooktop connection can be checked before it is used again. ### 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 U400 is not a zone or pan message and will not clear by letting the cooktop cool. It is about how the cooktop is connected to your home's power. ## What you may notice with it. The cooktop problems U400 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 U400 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/) [ER21](https://cooktoprepair.center/error-codes/bertazzoni-er21/) [E2](https://cooktoprepair.center/error-codes/bertazzoni-e2/) [L](https://cooktoprepair.center/error-codes/bertazzoni-l/) [A](https://cooktoprepair.center/error-codes/bertazzoni-a/) Induction power and coils on other makes [Bosch U400](https://cooktoprepair.center/error-codes/bosch-u400/) [Dacor C2](https://cooktoprepair.center/error-codes/dacor-c2/) [Fulgor Milano U400](https://cooktoprepair.center/error-codes/fulgor-milano-s700-u400/) [Gaggenau E9000](https://cooktoprepair.center/error-codes/gaggenau-e9000/) [KitchenAid FC E0](https://cooktoprepair.center/error-codes/kitchenaid-fc-e0/) [Samsung C2](https://cooktoprepair.center/error-codes/samsung-c2/) [SKS F33~F45](https://cooktoprepair.center/error-codes/sks-f33-f45/) [Thermador F9](https://cooktoprepair.center/error-codes/thermador-f9/) [All 25 codes of this kind](https://cooktoprepair.center/error-codes/#family-induction) 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 > Incorrect 400V connection, not suitable for the grill board [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 U400 cooktop repair, where we come out. 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Switch the cooktop off at the breaker and leave it off. If it comes back, it needs a visit. ### My new Bertazzoni cooktop showed U400 the first time it was powered. Why? On a fresh install, U400 almost always comes back to how the supply was connected. Turn the breaker off and have the connection checked before using the cooktop. ### Is it safe to keep using a Bertazzoni cooktop that shows U400? No. Treat it as an electrical problem: leave the breaker off and book a visit. ### Why does a Bertazzoni PE304T or PE365T call U400 a 400 V connection problem? The manual describes U400 as an incorrect 400 V connection that does not suit the power board. On a US installation, that points back to how the cooktop was wired at the junction box, which is work for a qualified person with the breaker off. --- **[Read on the site: Bertazzoni induction cooktop showing U400](https://cooktoprepair.center/error-codes/bertazzoni-u400/)** **[Book a visit with CooktopRepair.center](https://cooktoprepair.center/schedule/)**