--- title: "BlueStar induction cooktop showing U400" description: "What U400 means on BlueStar induction cooktops, what to check before booking, and when it is not a failure at all." url: "https://cooktoprepair.center/error-codes/bluestar-u400/" --- # BlueStar induction cooktop showing U400 BlueStar's TOUCH manual says U400 appears when the cooktop is not connected to the electrical network, and asks for the connection to be checked and remade. ## What U400 actually means. BlueStar's TOUCH manual says U400 appears when the cooktop is not connected to the electrical network, and asks for the connection to be checked and remade. BlueStar cooktop display What to do when U400 shows on the cooktop ### Kind of code Boards and communication The touch board and the power board under the glass lost track of each other, or one failed its own start-up check. A power dip, a ribbon or harness pulled loose when the top was fitted, or moisture from a boil-over is ruled out before a board is replaced, and a cooktop that keeps heating while this code shows is switched off at the breaker. ### Usually leads to Touch control repair Glass touch keys and sliders that ignore a finger, start zones by themselves or stay locked, traced to the keys, the control board or the lock setting. ### 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 BlueStar A Pennsylvania maker of open-burner gas cooking, sold in the US as pro rangetops with griddle and charbroiler options. ### Source BlueStar TOUCH induction cooktop use and care manual, Troubleshooting BlueStar TOUCH induction cooktop, model BSP36INDTOUCH. The earlier BlueStar induction cooktop manual (750164) lists the same codes. ## Before you book, in this order. Each step comes from BlueStar'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. 02 Have the connection checked and reconnected. 03 Book a visit if U400 returns with a sound connection. ### Still there? It usually turns into [touch control repair](https://cooktoprepair.center/services/touch-control-repair/). Book with the code and the model number. ### What not to do U400 does not point to a failed coil or keypad. It reports that the cooktop is not connected to the electrical network. ## 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 ## Touch control repair. **Touch control board or key panel · moderate.** Book a visit [What the job involves](https://cooktoprepair.center/services/touch-control-repair/) ## BlueStar cooktops. A Pennsylvania maker of open-burner gas cooking, sold in the US as pro rangetops with griddle and charbroiler options. [BlueStar cooktop repair](https://cooktoprepair.center/brands/bluestar/) More BlueStar codes [E](https://cooktoprepair.center/error-codes/bluestar-e/) [Er03](https://cooktoprepair.center/error-codes/bluestar-er03/) [E2](https://cooktoprepair.center/error-codes/bluestar-e2/) [E8](https://cooktoprepair.center/error-codes/bluestar-e8/) [Er47](https://cooktoprepair.center/error-codes/bluestar-er47/) [u](https://cooktoprepair.center/error-codes/bluestar-u/) [H](https://cooktoprepair.center/error-codes/bluestar-h/) [II](https://cooktoprepair.center/error-codes/bluestar-ii/) Boards and communication on other makes [Bosch E7010](https://cooktoprepair.center/error-codes/bosch-e7010/) [Café F + number (flashing)](https://cooktoprepair.center/error-codes/cafe-f-code/) [Dacor F0](https://cooktoprepair.center/error-codes/dacor-f0/) [Frigidaire C0](https://cooktoprepair.center/error-codes/frigidaire-c0/) [Fulgor Milano Er47](https://cooktoprepair.center/error-codes/fulgor-milano-s700-er47/) [Gaggenau E7010](https://cooktoprepair.center/error-codes/gaggenau-e7010/) [GE Profile F + number (flashing)](https://cooktoprepair.center/error-codes/ge-profile-f-code/) [GE F + number (FXX)](https://cooktoprepair.center/error-codes/ge-f-code/) [All 48 codes of this kind](https://cooktoprepair.center/error-codes/#family-communication) BlueStar 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. BlueStar 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. BlueStar 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 BlueStar's own words > The cooktop is not connected to the electrical network. [BlueStar TOUCH induction cooktop use and care manual, Troubleshooting](https://www.bluestarcooking.com/wp-content/uploads/2017/03/BlueStar-TOUCH-Induction-Use-Care-Manual-701122-11.20.18-w-warranty.pdf) [BlueStar TOUCH induction cooktop use and care manual, Troubleshooting](https://www.bluestarcooking.com/wp-content/uploads/2017/03/BlueStar-TOUCH-Induction-Use-Care-Manual-701122-11.20.18-w-warranty.pdf) Every code on this site is taken from the manufacturer's documentation, never from a forum or a parts listing. BlueStar TOUCH induction cooktop, model BSP36INDTOUCH. The earlier BlueStar induction cooktop manual (750164) lists the same codes. ## BlueStar 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. [All service areas](https://cooktoprepair.center/locations/) [Tampa Bay](https://cooktoprepair.center/locations/tampa-bay/) FL · 31 areas - [Hyde Park](https://cooktoprepair.center/locations/tampa-bay/hyde-park/) - [Davis Islands](https://cooktoprepair.center/locations/tampa-bay/davis-islands/) - [Palma Ceia](https://cooktoprepair.center/locations/tampa-bay/palma-ceia/) - [Westchase](https://cooktoprepair.center/locations/tampa-bay/westchase/) - [Carrollwood](https://cooktoprepair.center/locations/tampa-bay/carrollwood/) - [Belleair](https://cooktoprepair.center/locations/tampa-bay/belleair/) - [St. Pete Beach](https://cooktoprepair.center/locations/tampa-bay/st-pete-beach/) - [Palm Harbor](https://cooktoprepair.center/locations/tampa-bay/palm-harbor/) [Orlando](https://cooktoprepair.center/locations/orlando/) FL · 30 areas - [Winter Park](https://cooktoprepair.center/locations/orlando/winter-park/) - [Windermere](https://cooktoprepair.center/locations/orlando/windermere/) - [Dr. Phillips](https://cooktoprepair.center/locations/orlando/dr-phillips/) - [Bay Hill](https://cooktoprepair.center/locations/orlando/bay-hill/) - [Lake Nona](https://cooktoprepair.center/locations/orlando/lake-nona/) - [Heathrow](https://cooktoprepair.center/locations/orlando/heathrow/) - [Celebration](https://cooktoprepair.center/locations/orlando/celebration/) [Miami / South Florida](https://cooktoprepair.center/locations/south-florida/) FL · 47 areas - [Brickell](https://cooktoprepair.center/locations/south-florida/brickell/) - [Coconut Grove](https://cooktoprepair.center/locations/south-florida/coconut-grove/) - [Coral Gables](https://cooktoprepair.center/locations/south-florida/coral-gables/) - [Pinecrest](https://cooktoprepair.center/locations/south-florida/pinecrest/) - [Key Biscayne](https://cooktoprepair.center/locations/south-florida/key-biscayne/) - [Aventura](https://cooktoprepair.center/locations/south-florida/aventura/) - [Sunny Isles Beach](https://cooktoprepair.center/locations/south-florida/sunny-isles-beach/) - [Bal Harbour](https://cooktoprepair.center/locations/south-florida/bal-harbour/) - [Miami Beach](https://cooktoprepair.center/locations/south-florida/miami-beach/) - [Golden Beach](https://cooktoprepair.center/locations/south-florida/golden-beach/) - [Weston](https://cooktoprepair.center/locations/south-florida/weston/) - [Boca Raton](https://cooktoprepair.center/locations/south-florida/boca-raton/) - [Palm Beach](https://cooktoprepair.center/locations/south-florida/palm-beach/) [New York Metro](https://cooktoprepair.center/locations/new-york/) NY · 75 areas - [Upper East Side](https://cooktoprepair.center/locations/new-york/upper-east-side/) - [Upper West Side](https://cooktoprepair.center/locations/new-york/upper-west-side/) - [Tribeca](https://cooktoprepair.center/locations/new-york/tribeca/) - [SoHo](https://cooktoprepair.center/locations/new-york/soho/) - [Greenwich Village](https://cooktoprepair.center/locations/new-york/greenwich-village/) - [Battery Park City](https://cooktoprepair.center/locations/new-york/battery-park-city/) - [Brooklyn Heights](https://cooktoprepair.center/locations/new-york/brooklyn-heights/) - [Park Slope](https://cooktoprepair.center/locations/new-york/park-slope/) - [DUMBO](https://cooktoprepair.center/locations/new-york/dumbo/) - [Forest Hills](https://cooktoprepair.center/locations/new-york/forest-hills/) - [Great Neck](https://cooktoprepair.center/locations/new-york/great-neck/) - [Southampton](https://cooktoprepair.center/locations/new-york/southampton/) - [Scarsdale](https://cooktoprepair.center/locations/new-york/scarsdale/) [Houston](https://cooktoprepair.center/locations/houston/) TX · 36 areas - [River Oaks](https://cooktoprepair.center/locations/houston/river-oaks/) - [Memorial](https://cooktoprepair.center/locations/houston/memorial/) - [Tanglewood](https://cooktoprepair.center/locations/houston/tanglewood/) - [Greater Heights](https://cooktoprepair.center/locations/houston/greater-heights/) - [Kingwood](https://cooktoprepair.center/locations/houston/kingwood/) - [Bellaire](https://cooktoprepair.center/locations/houston/bellaire/) - [Bunker Hill Village](https://cooktoprepair.center/locations/houston/bunker-hill-village/) - [Piney Point Village](https://cooktoprepair.center/locations/houston/piney-point-village/) - [Hunters Creek Village](https://cooktoprepair.center/locations/houston/hunters-creek-village/) - [Sugar Land](https://cooktoprepair.center/locations/houston/sugar-land/) - [Cinco Ranch](https://cooktoprepair.center/locations/houston/cinco-ranch/) - [The Woodlands](https://cooktoprepair.center/locations/houston/the-woodlands/) - [West University](https://cooktoprepair.center/locations/houston/west-university/) [Chicago](https://cooktoprepair.center/locations/chicagoland/) IL · 50 areas - [Lincoln Park](https://cooktoprepair.center/locations/chicagoland/lincoln-park/) - [Near North Side](https://cooktoprepair.center/locations/chicagoland/near-north-side/) - [West Loop / Near West Side](https://cooktoprepair.center/locations/chicagoland/west-loop-near-west-side/) - [Wilmette](https://cooktoprepair.center/locations/chicagoland/wilmette/) - [Winnetka](https://cooktoprepair.center/locations/chicagoland/winnetka/) - [Glencoe](https://cooktoprepair.center/locations/chicagoland/glencoe/) - [River Forest](https://cooktoprepair.center/locations/chicagoland/river-forest/) - [Oak Park](https://cooktoprepair.center/locations/chicagoland/oak-park/) - [Hinsdale](https://cooktoprepair.center/locations/chicagoland/hinsdale/) - [Lake Forest](https://cooktoprepair.center/locations/chicagoland/lake-forest/) - [Highland Park](https://cooktoprepair.center/locations/chicagoland/highland-park/) - [Gold Coast](https://cooktoprepair.center/locations/chicagoland/gold-coast/) - [Lakeview](https://cooktoprepair.center/locations/chicagoland/lakeview/) [Los Angeles](https://cooktoprepair.center/locations/los-angeles/) CA · 95 areas - [Beverly Hills](https://cooktoprepair.center/locations/los-angeles/beverly-hills/) - [Bel Air](https://cooktoprepair.center/locations/los-angeles/bel-air/) - [Holmby Hills](https://cooktoprepair.center/locations/los-angeles/holmby-hills/) - [Brentwood](https://cooktoprepair.center/locations/los-angeles/brentwood/) - [Pacific Palisades](https://cooktoprepair.center/locations/los-angeles/pacific-palisades/) - [Santa Monica](https://cooktoprepair.center/locations/los-angeles/santa-monica/) - [Hancock Park](https://cooktoprepair.center/locations/los-angeles/hancock-park/) - [Studio City](https://cooktoprepair.center/locations/los-angeles/studio-city/) - [Calabasas](https://cooktoprepair.center/locations/los-angeles/calabasas/) - [Manhattan Beach](https://cooktoprepair.center/locations/los-angeles/manhattan-beach/) - [Palos Verdes Estates](https://cooktoprepair.center/locations/los-angeles/palos-verdes-estates/) - [Pasadena](https://cooktoprepair.center/locations/los-angeles/pasadena/) - [San Marino](https://cooktoprepair.center/locations/los-angeles/san-marino/) - [Malibu](https://cooktoprepair.center/locations/los-angeles/malibu/) [San Diego](https://cooktoprepair.center/locations/san-diego/) CA · 31 areas - [La Jolla](https://cooktoprepair.center/locations/san-diego/la-jolla/) - [Carmel Valley](https://cooktoprepair.center/locations/san-diego/carmel-valley/) - [Point Loma](https://cooktoprepair.center/locations/san-diego/point-loma/) - [Del Mar](https://cooktoprepair.center/locations/san-diego/del-mar/) - [Rancho Santa Fe](https://cooktoprepair.center/locations/san-diego/rancho-santa-fe/) - [Coronado](https://cooktoprepair.center/locations/san-diego/coronado/) - [Encinitas](https://cooktoprepair.center/locations/san-diego/encinitas/) - [Solana Beach](https://cooktoprepair.center/locations/san-diego/solana-beach/) [San Francisco Bay Area](https://cooktoprepair.center/locations/bay-area/) CA · 74 areas - [Pacific Heights](https://cooktoprepair.center/locations/bay-area/pacific-heights/) - [Presidio Heights](https://cooktoprepair.center/locations/bay-area/presidio-heights/) - [Russian Hill](https://cooktoprepair.center/locations/bay-area/russian-hill/) - [Noe Valley](https://cooktoprepair.center/locations/bay-area/noe-valley/) - [Sea Cliff](https://cooktoprepair.center/locations/bay-area/sea-cliff/) - [Hillsborough](https://cooktoprepair.center/locations/bay-area/hillsborough/) - [Atherton](https://cooktoprepair.center/locations/bay-area/atherton/) - [Woodside](https://cooktoprepair.center/locations/bay-area/woodside/) - [Palo Alto](https://cooktoprepair.center/locations/bay-area/palo-alto/) - [Los Altos Hills](https://cooktoprepair.center/locations/bay-area/los-altos-hills/) - [Tiburon](https://cooktoprepair.center/locations/bay-area/tiburon/) - [Piedmont](https://cooktoprepair.center/locations/bay-area/piedmont/) - [Marina](https://cooktoprepair.center/locations/bay-area/marina/) For the heart of your home. ## Questions about U400. ### Can I clear U400 myself? Switch the cooktop off at the breaker. If it comes back, it needs a visit. ### Is U400 a wiring problem on my BlueStar? BlueStar ties it to the cooktop's connection to the supply, so the wiring is checked first. ### Is it safe to keep resetting for U400? No. Leave the breaker off until the connection has been checked. ### Does U400 on a BlueStar TOUCH induction cooktop mean the voltage is too high? Not in BlueStar's manual, which says U400 appears when the cooktop is not connected to the electrical network. BlueStar's step is to check the connection and reconnect the cooktop. --- **[Read on the site: BlueStar induction cooktop showing U400](https://cooktoprepair.center/error-codes/bluestar-u400/)** **[Book a visit with CooktopRepair.center](https://cooktoprepair.center/schedule/)**