--- title: "Wolf induction stove showing U400 | StoveRepair.center" description: "What U400 means on Wolf induction stoves, what to check before booking, and when it is not a failure at all." url: "https://stoverepair.center/error-codes/wolf-u400/" --- # Wolf induction stove showing U400 U400 on a Wolf IR series induction stove means over voltage. ## What U400 actually means. U400 on a Wolf IR series induction stove means over voltage. The stovetop refuses to heat while the voltage reads too high. Wolf stove display What to do when U400 shows on the stove ### Kind of code Control board and power The main board failed its own start-up check, lost contact with the display, or saw the supply voltage sag too low, often after a storm, a power outage or a spill that ran down behind the panel. The breaker, the cord and the outlet are ruled out before a board is replaced. A stove that sparks, smells of hot wiring or keeps heating while this code shows is switched off at the breaker first. ### Usually leads to Control board and display repair Stoves with a blank or flashing display, touch keys that do not answer, codes that keep returning or a stove that will not turn on, traced to the board, the keypad or the power to them. ### Shows up as Stovetop Not Heating The burners on an electric, glass or induction stovetop stay cold or warm up only a little, sometimes all of them and sometimes two on one side, while the oven below may still work. ### Make Wolf A Sub-Zero Group cooking brand from Wisconsin; owners often know it on sight by its red knobs. ### Source Wolf answer: IR induction, U400 Wolf IR series induction stoves. Wolf's newer induction models use a separate list. ## Before you book, in this order. Each step comes from Wolf's own guidance for U400 on its stoves. Follow it to the end: the last card says whether this is a visit. 01 Turn all zones off. 02 Cut the breaker for 30 seconds before restoring power. 03 If U400 returns, have the supply checked and book a visit before cooking on it again. ### Still there? It usually turns into [control board and display repair](https://stoverepair.center/services/control-board-and-display-repair/). Book with the code and the model number. ### What not to do U400 is not a sign the coils are worn. The stovetop is protecting itself from its supply. ## What you may notice with it. The stove problems U400 tends to arrive with. Answer these at the stove before anyone is booked. [All problems](https://stoverepair.center/problems/) Before you call ### [Stovetop Not Heating](https://stoverepair.center/problems/stovetop-not-heating/) [All 6 causes, cheapest first](https://stoverepair.center/problems/stovetop-not-heating/) It also comes with - [**Stove Error Code**](https://stoverepair.center/problems/stove-error-code/) Problem ### Stovetop Not Heating 6 causes, cheapest first Where U400 usually leads ## Control board and display repair. **Control board, keypad or display · moderate.** Book a visit [What the job involves](https://stoverepair.center/services/control-board-and-display-repair/) ## Wolf stoves. A Sub-Zero Group cooking brand from Wisconsin; owners often know it on sight by its red knobs. [Wolf stove repair](https://stoverepair.center/brands/wolf/) More Wolf codes [01](https://stoverepair.center/error-codes/wolf-01/) [02](https://stoverepair.center/error-codes/wolf-02/) [03](https://stoverepair.center/error-codes/wolf-03/) [04](https://stoverepair.center/error-codes/wolf-04/) [09](https://stoverepair.center/error-codes/wolf-09/) [0E](https://stoverepair.center/error-codes/wolf-0e/) [10](https://stoverepair.center/error-codes/wolf-10/) [PF](https://stoverepair.center/error-codes/wolf-pf/) [ERR OC](https://stoverepair.center/error-codes/wolf-err-oc/) [0221](https://stoverepair.center/error-codes/wolf-0221/) [3C20](https://stoverepair.center/error-codes/wolf-3c20/) [5521](https://stoverepair.center/error-codes/wolf-5521/) [All 15 Wolf codes](https://stoverepair.center/error-codes/#codes-wolf) Control board and power on other makes [AGA CE](https://stoverepair.center/error-codes/aga-ce/) [BlueStar F20](https://stoverepair.center/error-codes/bluestar-f20/) [Bosch e005](https://stoverepair.center/error-codes/bosch-e005/) [Café F97](https://stoverepair.center/error-codes/cafe-f97/) [Dacor C-F0](https://stoverepair.center/error-codes/dacor-c-f0/) [Electrolux Err](https://stoverepair.center/error-codes/electrolux-err/) [Fisher & Paykel F](https://stoverepair.center/error-codes/fisher-and-paykel-f/) [Frigidaire F3](https://stoverepair.center/error-codes/frigidaire-f3/) [All 75 codes of this kind](https://stoverepair.center/error-codes/#family-board) Wolf builds this ### Gas stove A stove with gas burners on top, whether its oven below runs on gas too or on electricity, fed by one gas line behind it and plugged into a wall outlet for the spark. Wolf builds this ### Induction stove A stove with a flat glass top that heats the pan itself through a magnetic field, run by touch keys and power boards, with an electric oven underneath. ## In Wolf's own words > Over voltage [Wolf answer: IR induction, U400](https://www.subzero-wolf.com/assistance/answers/wolf/legacy-induction-range/induction-ranges-ir-series-error-code-u400) [Wolf answer: IR induction, U400](https://www.subzero-wolf.com/assistance/answers/wolf/legacy-induction-range/induction-ranges-ir-series-error-code-u400) Every code on this site is taken from the manufacturer's documentation, never from a forum or a parts listing. Wolf IR series induction stoves. Wolf's newer induction models use a separate list. ## Wolf U400 stove 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 all zones off. If it comes back, it needs a visit. ### My new Wolf induction stove showed U400 on day one. Why? On a new install, U400 can point to how the stove was connected at the terminal block. Have the installer or an electrician confirm the wiring matches the manual. ### Can I keep cooking on my Wolf induction stove if U400 goes away by itself? If it clears and never comes back, the stove is usually fine. If it keeps returning, stop and have the supply measured. ### Is U400 on a Wolf stove the same as E6? Both involve the power supply, but U400 says the voltage is too high while E6 is a broader supply error. Either way the supply is tested first. --- **[Read on the site: Wolf induction stove showing U400 | StoveRepair.center](https://stoverepair.center/error-codes/wolf-u400/)** **[Book a visit with StoveRepair.center](https://stoverepair.center/schedule/)**