--- title: "Gaggenau E300: the combi-microwave was wired or powered up wrongly" description: "What E300 means on Gaggenau E300: the combi-microwave was wired or powered up wronglys, what to check before booking, and when it is not a failure at all." url: "https://microwaverepair.center/error-codes/gaggenau-e300/" --- # Gaggenau E300: the combi-microwave was wired or powered up wrongly The BMP 250/251 runs on a 240-volt supply with two hot legs, L1 and L2. ## What E300 actually means. The BMP 250/251 runs on a 240-volt supply with two hot legs, L1 and L2. Gaggenau's manual gives E300 three causes: incorrect wiring at the connection point, L1 and L2 not being powered at the same moment, or a failure in the module combination, which is a service matter. Gaggenau microwave display What to do when E300 shows on the microwave ### Kind of code Power and supply The microwave has noticed trouble with the power reaching it: an outage or a brownout that interrupted a cycle, a voltage too low for the magnetron to start, or a supply that dipped when something else on the circuit switched on. As often as not the cause is the circuit, the outlet in the cabinet above or the breaker rather than the unit; a main fuse that blows again after a reset points inside, where only a technician goes. ### Usually leads to Microwave diagnostic visit A visit that times a cup of water against the clock, checks the door and its switches, then tests the high-voltage section, the controls and the moving parts one at a time until a single part is named. ### Shows up as What a Microwave Error Code Is Telling You A microwave error code may be a letter and a number on the display, a lock or demo word, a row of dashes, or a beep with a blinking clock, and it can show while the microwave still heats or block every key until it is cleared. ### Make Gaggenau Gaggenau microwaves and combination units examined on site, beginning with the mode that was chosen when the problem first showed up. ### Source Gaggenau BMP 250/251 710 combi-microwave oven Use and care manual Gaggenau 200 series BMP 250/251 710 combi-microwave ovens (manual 9001287041). The current Expressive series manual does not list E300. ## Before you book, in this order. Each step comes from Gaggenau's own guidance for E300 on its microwaves. Follow it to the end: the last card says whether this is a visit. 01 Switch off the double-pole breaker for the unit. 02 Turn it back on in one motion so both legs come on together; do not switch individual poles. 03 If E300 remains, have a qualified electrician check the connection wiring, then book a visit if the wiring is correct. ### Still there? It usually turns into [microwave diagnostic visit](https://microwaverepair.center/services/diagnostic-visit/). Book with the code and the model number. ### What not to do E300 is not a magnetron or door problem, and it usually shows right after installation or electrical work. Owners should not open the junction box themselves; wiring is checked by a qualified person. ## What you may notice with it. The microwave problems E300 tends to arrive with. Answer these at the microwave before anyone is booked. [All problems](https://microwaverepair.center/problems/) Before you call ### [What a Microwave Error Code Is Telling You](https://microwaverepair.center/problems/microwave-error-code/) [All 7 causes, cheapest first](https://microwaverepair.center/problems/microwave-error-code/) It also comes with - [**Microwave Won't Turn On at All**](https://microwaverepair.center/problems/microwave-not-turning-on/) - [**Microwave Trips the Breaker or Blows a Fuse**](https://microwaverepair.center/problems/microwave-tripping-breaker/) Problem ### What a Microwave Error Code Is Telling You 7 causes, cheapest first Where E300 usually leads ## Microwave diagnostic visit. Book a visit [What the job involves](https://microwaverepair.center/services/diagnostic-visit/) ## Gaggenau microwaves. Gaggenau microwaves and combination units examined on site, beginning with the mode that was chosen when the problem first showed up. [Gaggenau microwave repair](https://microwaverepair.center/brands/gaggenau/) More Gaggenau codes [Exx](https://microwaverepair.center/error-codes/gaggenau-exx/) [Demo mode](https://microwaverepair.center/error-codes/gaggenau-demo-mode/) [Child lock](https://microwaverepair.center/error-codes/gaggenau-child-lock/) [Initialization](https://microwaverepair.center/error-codes/gaggenau-initialization/) [Safety switch-off](https://microwaverepair.center/error-codes/gaggenau-safety-switch-off/) Power and supply on other makes [Bertazzoni SERVICE](https://microwaverepair.center/error-codes/bertazzoni-service/) [Bosch ENJOY YOUR MICROWAVE TOUCH CLEAR](https://microwaverepair.center/error-codes/bosch-enjoy-your-microwave/) [Café PF](https://microwaverepair.center/error-codes/cafe-pf/) [Dacor WELCOME PRESS CLEAR AND PRESS CLOCK](https://microwaverepair.center/error-codes/dacor-welcome/) [Fisher & Paykel WELCOME PRESS CLEAR AND PRESS CLOCK](https://microwaverepair.center/error-codes/fisher-and-paykel-welcome/) [Fulgor Milano WELCOME PRESS CLEAR AND PRESS CLOCK](https://microwaverepair.center/error-codes/fulgor-milano-welcome/) [GE Profile PF](https://microwaverepair.center/error-codes/ge-profile-pf/) [JennAir PF](https://microwaverepair.center/error-codes/jennair-pf/) [All 20 codes of this kind](https://microwaverepair.center/error-codes/#family-power) Gaggenau builds this ### Built-in microwave A microwave set into a tall cabinet or a wall of cabinetry at eye level, either a countertop body wrapped in a trim kit or a true built-in model, including speed and convection microwaves that brown as well as heat. ## In Gaggenau's own words > Incorrect wiring at first power up [Gaggenau BMP 250/251 710 combi-microwave oven Use and care manual](https://media3.gaggenau.com/Documents/9001287041_C.pdf) [Gaggenau BMP 250/251 710 combi-microwave oven Use and care manual](https://media3.gaggenau.com/Documents/9001287041_C.pdf) [Gaggenau BMP 250/251 710 combi-microwave oven Use and care manual](https://media3.gaggenau.com/Documents/9001287041_C.pdf) Every code on this site is taken from the manufacturer's documentation, never from a forum or a parts listing. Gaggenau 200 series BMP 250/251 710 combi-microwave ovens (manual 9001287041). The current Expressive series manual does not list E300. ## Gaggenau E300 microwave 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://microwaverepair.center/locations/) [Tampa Bay](https://microwaverepair.center/locations/tampa-bay/) FL · 31 areas - [Hyde Park](https://microwaverepair.center/locations/tampa-bay/hyde-park/) - [Davis Islands](https://microwaverepair.center/locations/tampa-bay/davis-islands/) - [Palma Ceia](https://microwaverepair.center/locations/tampa-bay/palma-ceia/) - [Westchase](https://microwaverepair.center/locations/tampa-bay/westchase/) - [Carrollwood](https://microwaverepair.center/locations/tampa-bay/carrollwood/) - [Belleair](https://microwaverepair.center/locations/tampa-bay/belleair/) - [St. Pete Beach](https://microwaverepair.center/locations/tampa-bay/st-pete-beach/) - [Palm Harbor](https://microwaverepair.center/locations/tampa-bay/palm-harbor/) [Orlando](https://microwaverepair.center/locations/orlando/) FL · 30 areas - [Winter Park](https://microwaverepair.center/locations/orlando/winter-park/) - [Windermere](https://microwaverepair.center/locations/orlando/windermere/) - [Dr. Phillips](https://microwaverepair.center/locations/orlando/dr-phillips/) - [Bay Hill](https://microwaverepair.center/locations/orlando/bay-hill/) - [Lake Nona](https://microwaverepair.center/locations/orlando/lake-nona/) - [Heathrow](https://microwaverepair.center/locations/orlando/heathrow/) - [Celebration](https://microwaverepair.center/locations/orlando/celebration/) [Miami / South Florida](https://microwaverepair.center/locations/south-florida/) FL · 47 areas - [Brickell](https://microwaverepair.center/locations/south-florida/brickell/) - [Coconut Grove](https://microwaverepair.center/locations/south-florida/coconut-grove/) - [Coral Gables](https://microwaverepair.center/locations/south-florida/coral-gables/) - [Pinecrest](https://microwaverepair.center/locations/south-florida/pinecrest/) - [Key Biscayne](https://microwaverepair.center/locations/south-florida/key-biscayne/) - [Aventura](https://microwaverepair.center/locations/south-florida/aventura/) - [Sunny Isles Beach](https://microwaverepair.center/locations/south-florida/sunny-isles-beach/) - [Bal Harbour](https://microwaverepair.center/locations/south-florida/bal-harbour/) - [Miami Beach](https://microwaverepair.center/locations/south-florida/miami-beach/) - [Golden Beach](https://microwaverepair.center/locations/south-florida/golden-beach/) - [Weston](https://microwaverepair.center/locations/south-florida/weston/) - [Boca Raton](https://microwaverepair.center/locations/south-florida/boca-raton/) - [Palm Beach](https://microwaverepair.center/locations/south-florida/palm-beach/) [New York Metro](https://microwaverepair.center/locations/new-york/) NY · 75 areas - [Upper East Side](https://microwaverepair.center/locations/new-york/upper-east-side/) - [Upper West Side](https://microwaverepair.center/locations/new-york/upper-west-side/) - [Tribeca](https://microwaverepair.center/locations/new-york/tribeca/) - [SoHo](https://microwaverepair.center/locations/new-york/soho/) - [Greenwich Village](https://microwaverepair.center/locations/new-york/greenwich-village/) - [Battery Park City](https://microwaverepair.center/locations/new-york/battery-park-city/) - [Brooklyn Heights](https://microwaverepair.center/locations/new-york/brooklyn-heights/) - [Park Slope](https://microwaverepair.center/locations/new-york/park-slope/) - [DUMBO](https://microwaverepair.center/locations/new-york/dumbo/) - [Forest Hills](https://microwaverepair.center/locations/new-york/forest-hills/) - [Great Neck](https://microwaverepair.center/locations/new-york/great-neck/) - [Southampton](https://microwaverepair.center/locations/new-york/southampton/) - [Scarsdale](https://microwaverepair.center/locations/new-york/scarsdale/) [Houston](https://microwaverepair.center/locations/houston/) TX · 36 areas - [River Oaks](https://microwaverepair.center/locations/houston/river-oaks/) - [Memorial](https://microwaverepair.center/locations/houston/memorial/) - [Tanglewood](https://microwaverepair.center/locations/houston/tanglewood/) - [Greater Heights](https://microwaverepair.center/locations/houston/greater-heights/) - [Kingwood](https://microwaverepair.center/locations/houston/kingwood/) - [Bellaire](https://microwaverepair.center/locations/houston/bellaire/) - [Bunker Hill Village](https://microwaverepair.center/locations/houston/bunker-hill-village/) - [Piney Point Village](https://microwaverepair.center/locations/houston/piney-point-village/) - [Hunters Creek Village](https://microwaverepair.center/locations/houston/hunters-creek-village/) - [Sugar Land](https://microwaverepair.center/locations/houston/sugar-land/) - [Cinco Ranch](https://microwaverepair.center/locations/houston/cinco-ranch/) - [The Woodlands](https://microwaverepair.center/locations/houston/the-woodlands/) - [West University](https://microwaverepair.center/locations/houston/west-university/) [Chicago](https://microwaverepair.center/locations/chicagoland/) IL · 50 areas - [Lincoln Park](https://microwaverepair.center/locations/chicagoland/lincoln-park/) - [Near North Side](https://microwaverepair.center/locations/chicagoland/near-north-side/) - [West Loop / Near West Side](https://microwaverepair.center/locations/chicagoland/west-loop-near-west-side/) - [Wilmette](https://microwaverepair.center/locations/chicagoland/wilmette/) - [Winnetka](https://microwaverepair.center/locations/chicagoland/winnetka/) - [Glencoe](https://microwaverepair.center/locations/chicagoland/glencoe/) - [River Forest](https://microwaverepair.center/locations/chicagoland/river-forest/) - [Oak Park](https://microwaverepair.center/locations/chicagoland/oak-park/) - [Hinsdale](https://microwaverepair.center/locations/chicagoland/hinsdale/) - [Lake Forest](https://microwaverepair.center/locations/chicagoland/lake-forest/) - [Highland Park](https://microwaverepair.center/locations/chicagoland/highland-park/) - [Gold Coast](https://microwaverepair.center/locations/chicagoland/gold-coast/) - [Lakeview](https://microwaverepair.center/locations/chicagoland/lakeview/) [Los Angeles](https://microwaverepair.center/locations/los-angeles/) CA · 95 areas - [Beverly Hills](https://microwaverepair.center/locations/los-angeles/beverly-hills/) - [Bel Air](https://microwaverepair.center/locations/los-angeles/bel-air/) - [Holmby Hills](https://microwaverepair.center/locations/los-angeles/holmby-hills/) - [Brentwood](https://microwaverepair.center/locations/los-angeles/brentwood/) - [Pacific Palisades](https://microwaverepair.center/locations/los-angeles/pacific-palisades/) - [Santa Monica](https://microwaverepair.center/locations/los-angeles/santa-monica/) - [Hancock Park](https://microwaverepair.center/locations/los-angeles/hancock-park/) - [Studio City](https://microwaverepair.center/locations/los-angeles/studio-city/) - [Calabasas](https://microwaverepair.center/locations/los-angeles/calabasas/) - [Manhattan Beach](https://microwaverepair.center/locations/los-angeles/manhattan-beach/) - [Palos Verdes Estates](https://microwaverepair.center/locations/los-angeles/palos-verdes-estates/) - [Pasadena](https://microwaverepair.center/locations/los-angeles/pasadena/) - [San Marino](https://microwaverepair.center/locations/los-angeles/san-marino/) - [Malibu](https://microwaverepair.center/locations/los-angeles/malibu/) [San Diego](https://microwaverepair.center/locations/san-diego/) CA · 31 areas - [La Jolla](https://microwaverepair.center/locations/san-diego/la-jolla/) - [Carmel Valley](https://microwaverepair.center/locations/san-diego/carmel-valley/) - [Point Loma](https://microwaverepair.center/locations/san-diego/point-loma/) - [Del Mar](https://microwaverepair.center/locations/san-diego/del-mar/) - [Rancho Santa Fe](https://microwaverepair.center/locations/san-diego/rancho-santa-fe/) - [Coronado](https://microwaverepair.center/locations/san-diego/coronado/) - [Encinitas](https://microwaverepair.center/locations/san-diego/encinitas/) - [Solana Beach](https://microwaverepair.center/locations/san-diego/solana-beach/) [San Francisco Bay Area](https://microwaverepair.center/locations/bay-area/) CA · 74 areas - [Pacific Heights](https://microwaverepair.center/locations/bay-area/pacific-heights/) - [Presidio Heights](https://microwaverepair.center/locations/bay-area/presidio-heights/) - [Russian Hill](https://microwaverepair.center/locations/bay-area/russian-hill/) - [Noe Valley](https://microwaverepair.center/locations/bay-area/noe-valley/) - [Sea Cliff](https://microwaverepair.center/locations/bay-area/sea-cliff/) - [Hillsborough](https://microwaverepair.center/locations/bay-area/hillsborough/) - [Atherton](https://microwaverepair.center/locations/bay-area/atherton/) - [Woodside](https://microwaverepair.center/locations/bay-area/woodside/) - [Palo Alto](https://microwaverepair.center/locations/bay-area/palo-alto/) - [Los Altos Hills](https://microwaverepair.center/locations/bay-area/los-altos-hills/) - [Tiburon](https://microwaverepair.center/locations/bay-area/tiburon/) - [Piedmont](https://microwaverepair.center/locations/bay-area/piedmont/) - [Marina](https://microwaverepair.center/locations/bay-area/marina/) For the heart of your home. ## Questions about E300. ### Can I clear E300 myself? Switch off the double-pole breaker for the unit. If it comes back, it needs a visit. ### Why did my Gaggenau show E300 right after a kitchen remodel? Gaggenau ties E300 to wiring at first power-up or to the two supply legs coming on separately. New electrical work is exactly when that happens. ### Can a single-pole breaker cause Gaggenau E300? The appliance needs both L1 and L2 energized together, which a proper double-pole breaker does. Have an electrician confirm the circuit. ### What if the wiring is right and E300 stays? Gaggenau lists a module failure as the third cause, and that needs service. Book a visit and mention E300. --- **[Read on the site: Gaggenau E300: the combi-microwave was wired or powered up wrongly](https://microwaverepair.center/error-codes/gaggenau-e300/)** **[Book a visit with MicrowaveRepair.center](https://microwaverepair.center/schedule/)**