--- title: "Gaggenau cooktop showing U400 | CooktopRepair.center" description: "What U400 means on Gaggenau cooktops, what to check before booking, and when it is not a failure at all." url: "https://cooktoprepair.center/error-codes/gaggenau-u400/" --- # Gaggenau cooktop showing U400 U400 is a second Gaggenau code for incorrect supply voltage. ## What U400 actually means. U400 is a second Gaggenau code for incorrect supply voltage. The circuit, not the cooktop, is the first suspect. Gaggenau 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 Tripping Breaker The circuit breaker for the cooktop trips as a burner or zone switches on, at one particular setting, or a few minutes into cooking. ### Make Gaggenau A German luxury maker, part of the BSH group, known for built-in cooking sold into custom kitchens. ### Source Gaggenau CI 292 602 induction cooktop use and care manual (en-us), Troubleshooting From the troubleshooting table of Gaggenau's US manual for the CI 292 602 200 series induction cooktop; the codes are printed in a display typeface and were read from the rendered page. ## Before you book, in this order. Each step comes from Gaggenau's own guidance for U400 on its cooktops. Follow it to the end: the last card says whether this is a visit. 01 Turn the breaker off and leave it off. 02 Leave the junction box to the electrician rather than opening it yourself. 03 Get the supply checked; book a visit if it is normal and U400 persists. ### 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 cleared by switching zones or pans. The circuit is the first suspect, not the zones. ## 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 Tripping Breaker](https://cooktoprepair.center/problems/cooktop-tripping-breaker/) [All 6 causes, cheapest first](https://cooktoprepair.center/problems/cooktop-tripping-breaker/) It also comes with - [**Cooktop Error Code**](https://cooktoprepair.center/problems/cooktop-error-code/) Gas, fire, broken glass or live current ### Cooktop Tripping Breaker 6 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/) ## Gaggenau cooktops. A German luxury maker, part of the BSH group, known for built-in cooking sold into custom kitchens. [Gaggenau cooktop repair](https://cooktoprepair.center/brands/gaggenau/) More Gaggenau codes [F1](https://cooktoprepair.center/error-codes/gaggenau-f1/) [F2](https://cooktoprepair.center/error-codes/gaggenau-f2/) [F4](https://cooktoprepair.center/error-codes/gaggenau-f4/) [F0](https://cooktoprepair.center/error-codes/gaggenau-f0/) [F5](https://cooktoprepair.center/error-codes/gaggenau-f5/) [F8](https://cooktoprepair.center/error-codes/gaggenau-f8/) [E7010](https://cooktoprepair.center/error-codes/gaggenau-e7010/) [E8202](https://cooktoprepair.center/error-codes/gaggenau-e8202/) [E8204](https://cooktoprepair.center/error-codes/gaggenau-e8204/) [E8205](https://cooktoprepair.center/error-codes/gaggenau-e8205/) [E8206](https://cooktoprepair.center/error-codes/gaggenau-e8206/) [E9000](https://cooktoprepair.center/error-codes/gaggenau-e9000/) [All 14 Gaggenau codes](https://cooktoprepair.center/error-codes/#codes-gaggenau) Induction power and coils on other makes [Bertazzoni U400](https://cooktoprepair.center/error-codes/bertazzoni-u400/) [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/) [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 24 codes of this kind](https://cooktoprepair.center/error-codes/#family-induction) Gaggenau 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. Gaggenau 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. ## In Gaggenau's own words > The supply voltage is incorrect. It is outside the normal operating range. [Gaggenau CI 292 602 induction cooktop use and care manual (en-us), Troubleshooting](https://media3.gaggenau.com/Documents/9001444925_B.pdf) Every code on this site is taken from the manufacturer's documentation, never from a forum or a parts listing. From the troubleshooting table of Gaggenau's US manual for the CI 292 602 200 series induction cooktop; the codes are printed in a display typeface and were read from the rendered page. ## Gaggenau U400 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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Turn the breaker off and leave it off. If it comes back, it needs a visit. ### Why does my Gaggenau show U400 instead of E9000? Both appear in the manual for the same supply condition. ### Can a new countertop install cause U400? If the wiring below was disturbed, yes; the connection is checked along with the supply. ### Is U400 on a Gaggenau more serious than E9000? The manual gives them the same meaning, supply voltage outside the normal operating band. Neither one is cleared by using the cooktop through it. Keep the breaker off until the supply has been checked. --- **[Read on the site: Gaggenau cooktop showing U400 | CooktopRepair.center](https://cooktoprepair.center/error-codes/gaggenau-u400/)** **[Book a visit with CooktopRepair.center](https://cooktoprepair.center/schedule/)**