--- title: "Thermador induction range showing U400 | RangeRepair.center" description: "What U400 means on Thermador induction ranges, what to check before booking, and when it is not a failure at all." url: "https://rangerepair.center/error-codes/thermador-u400/" --- # Thermador induction range showing U400 U400 is another Thermador code for supply voltage outside the normal range. ## What U400 actually means. U400 is another Thermador code for supply voltage outside the normal range. Thermador treats it the same way as E9000. Thermador range display What to do when U400 shows on the range ### Kind of code Controls and communication The display, the main board or the induction power board lost contact with one another, or one of them failed its own self-check. A power dip, a loose cable or moisture from a boil-over is ruled out before a board is replaced, and a range that keeps heating while this code shows is switched off at the breaker. ### Usually leads to Knobs, switches and controls Knobs that spin or crack, touch keys that do nothing, blank displays, clocks that reset and control boards that switch the wrong thing. ### Shows up as Range Keeps Tripping the Breaker The range breaker trips when you switch on an element, the oven or self-clean, or it trips by itself with the range idle. ### Make Thermador A luxury BSH brand selling Pro Harmony and Pro Grand ranges in gas, dual-fuel and induction versions. ### Source Thermador "Ranges - Error Codes" support page U400 sits on Thermador's range code page under induction, which covers its induction ranges. ## Before you book, in this order. Each step comes from Thermador's own guidance for U400 on its ranges. Follow it to the end: the last card says whether this is a visit. 01 Turn the range off at the breaker. 02 Have the supply measured; book a visit if the voltage is fine. ### Still there? It usually turns into [knobs, switches and controls](https://rangerepair.center/services/knobs-switches-and-controls/). Book with the code and the model number. ### What not to do U400 is not a zone or pan message. ## What you may notice with it. The range problems U400 tends to arrive with. Answer these at the range before anyone is booked. [All problems](https://rangerepair.center/problems/) Before you call ### [Range Keeps Tripping the Breaker](https://rangerepair.center/problems/range-tripping-breaker/) [All 6 causes, cheapest first](https://rangerepair.center/problems/range-tripping-breaker/) It also comes with - [**Range Error Code**](https://rangerepair.center/problems/range-error-code/) Gas, fire or electrical risk ### Range Keeps Tripping the Breaker 6 causes, cheapest first Where U400 usually leads ## Knobs, switches and controls. **Knobs, keypad or control board · moderate.** Book a visit [What the job involves](https://rangerepair.center/services/knobs-switches-and-controls/) ## Thermador ranges. A luxury BSH brand selling Pro Harmony and Pro Grand ranges in gas, dual-fuel and induction versions. [Thermador range repair](https://rangerepair.center/brands/thermador/) More Thermador codes [E](https://rangerepair.center/error-codes/thermador-e-number/) [E0211](https://rangerepair.center/error-codes/thermador-e0211/) [dE](https://rangerepair.center/error-codes/thermador-de/) [E7010](https://rangerepair.center/error-codes/thermador-e7010/) [E9000](https://rangerepair.center/error-codes/thermador-e9000/) [F1](https://rangerepair.center/error-codes/thermador-f1/) [F2](https://rangerepair.center/error-codes/thermador-f2/) [F4](https://rangerepair.center/error-codes/thermador-f4/) [F5](https://rangerepair.center/error-codes/thermador-f5/) [F8](https://rangerepair.center/error-codes/thermador-f8/) Controls and communication on other makes [AGA FE](https://rangerepair.center/error-codes/aga-fe/) [BlueStar F20](https://rangerepair.center/error-codes/bluestar-range-f20/) [Bosch e005](https://rangerepair.center/error-codes/bosch-e005/) [Café F7](https://rangerepair.center/error-codes/cafe-f7/) [Dacor C-d0](https://rangerepair.center/error-codes/dacor-range-c-d0/) [Electrolux Err](https://rangerepair.center/error-codes/electrolux-err-number/) [Fisher & Paykel F + number](https://rangerepair.center/error-codes/fisher-and-paykel-range-f-number/) [Frigidaire F1](https://rangerepair.center/error-codes/frigidaire-f1/) [All 66 codes of this kind](https://rangerepair.center/error-codes/#family-communication) Thermador builds this ### Gas range Open flames on top and a gas-fired oven below, all fed by one supply line behind the range and lit by igniters rather than a match. Thermador builds this ### Dual-fuel range Gas burners on top and an electric oven below, the combination most professional-style ranges use, needing both a gas line and a 240-volt circuit. Thermador builds this ### Induction range A glass top that heats the pan itself through copper coils and power boards, over an electric oven, with electronics doing almost all the work. ## In Thermador's own words > The supply voltage is incorrect. [Thermador "Ranges - Error Codes" support page](https://www.thermador.com/us/support/ranges/error-codes) Every code on this site is taken from the manufacturer's documentation, never from a forum or a parts listing. U400 sits on Thermador's range code page under induction, which covers its induction ranges. ## Thermador U400 range 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 range off at the breaker. If it comes back, it needs a visit. ### Why does my Thermador show U400 only in the evening? Supply voltage can dip at times of heavy use. Measuring it when the code appears helps pin it down. ### Should I keep cooking on a Thermador that shows U400? Better not. Leave it off until the supply has been checked. --- **[Read on the site: Thermador induction range showing U400 | RangeRepair.center](https://rangerepair.center/error-codes/thermador-u400/)** **[Book a visit with RangeRepair.center](https://rangerepair.center/schedule/)**