--- title: "Microwave Magnetron Repair | MicrowaveRepair.center" description: "Replacing the tube that makes a microwave's heat, after proving the parts that feed it are sound, and renewing the waveguide cover and any pitted metal where…" url: "https://microwaverepair.center/services/microwave-magnetron-repair/" --- # Microwave Magnetron Repair Replacing the tube that makes a microwave's heat, after proving the parts that feed it are sound, and renewing the waveguide cover and any pitted metal where sparks have been. ## What the microwave magnetron repair involves. The magnetron is a small, heavy tube bolted to the side of the cavity, and it is the only part of a microwave that turns electricity into the energy that heats food. It wears out with hours of use, and it is damaged sooner by running the microwave empty, by long cycles with little in the cavity, and by arcing from a burned waveguide cover that reflects energy back into it. A failing magnetron heats weakly, heats in bursts, buzzes loudly, or stops heating while everything else keeps running. Because a dead diode, a failed capacitor, a thermal cutout or a transformer can look exactly the same from outside, the magnetron is replaced only after those have been tested, with the capacitor discharged first. Its filament and its insulation to the case are checked on a meter, the new tube is fitted with its gasket seated evenly on the waveguide, and the cooling fan that keeps it alive is checked too. When the arcing came from the cavity side, the waveguide cover is replaced and any scorched paint beneath it is dealt with, or the new tube will meet the same end. On a small countertop unit the technician tells you before ordering whether the magnetron is worth fitting at all. How the visit goes ### What it usually costs Moderate to highest · Magnetron and waveguide cover A burned waveguide cover alone is a small part. A new magnetron is one of the dearest parts a microwave takes, and on a hood combination or a drawer that has to come out of its mounting the labor adds a step. ### Answers 6 problems Microwave Runs but Food Stays Cold Loud Hum, Buzz or Grinding From a Microwave · Sparks Flashing Inside a Microwave · Burning Smell From a Microwave · Microwave Shuts Off Before the Timer Ends · Microwave Trips the Breaker or Blows a Fuse ### Comes up most on Microwave hood combination Built-in microwave · Microwave drawer · Countertop microwave ### Codes that lead here A5 · F3T4 · E23 · F3T4 Fisher & Paykel A5: the microwave system has overheated. ## Microwave magnetron repair, step by step. Close the cabinet, test the door for leakage, and reheat the water to show the heat is back to what the unit should deliver. 01 Heat a measured cup of water and listen to the unit run, noting any buzz, hum or flash in the cavity. 02 Cut the power, open the cabinet and discharge the capacitor, then test the diode, the capacitor, the transformer and the thermal cutouts first. 03 Read the magnetron's filament and check its insulation to the case, and look at the waveguide cover and the cavity wall for burn marks. 04 Fit the new magnetron with its gasket seated, renew a burned waveguide cover, and check the cooling fan that blows across the tube. 05 Close the cabinet, test the door for leakage, and reheat the water to show the heat is back to what the unit should deliver. ## The problems it answers. 6 of them, from microwave runs but food stays cold to microwave trips the breaker or blows a fuse. [All problems](https://microwaverepair.center/problems/) Most common ### Microwave Runs but Food Stays Cold 7 causes, cheapest first Before you call ### Tell us this when you book 1. Whether it stopped heating suddenly, grew weaker over months, or heats only now and then 2. Whether you heard a loud buzz or hum, or saw sparks, a flash or a small flame on the side wall 3. Whether it has ever been run empty, or with a very small amount of food for a long time 4. The type and rough age of the microwave, and whether it has a convection or speed mode It also answers - [**Loud Hum, Buzz or Grinding From a Microwave** 6 causes](https://microwaverepair.center/problems/microwave-loud-humming-or-buzzing/) - [**Sparks Flashing Inside a Microwave** 6 causes · stop using it](https://microwaverepair.center/problems/microwave-sparking-inside/) - [**Burning Smell From a Microwave** 6 causes · stop using it](https://microwaverepair.center/problems/microwave-burning-smell/) - [**Microwave Shuts Off Before the Timer Ends** 6 causes](https://microwaverepair.center/problems/microwave-stops-mid-cycle/) - [**Microwave Trips the Breaker or Blows a Fuse** 6 causes · stop using it](https://microwaverepair.center/problems/microwave-tripping-breaker/) ## Moderate to highest, on the site's scale. A burned waveguide cover alone is a small part. A new magnetron is one of the dearest parts a microwave takes, and on a hood combination or a drawer that has to come out of its mounting the labor adds a step. [Read the full cost guide](https://microwaverepair.center/cost/) | Repair | Relative cost | | --- | --- | | **Magnetron and waveguide cover** | moderate to highest | | [High-voltage diode, capacitor, transformer or inverter board](https://microwaverepair.center/services/microwave-high-voltage-diode-and-capacitor-repair/) | | | [Door interlock switches, latch or hinge](https://microwaverepair.center/services/microwave-door-switch-and-latch-repair/) | | | [Turntable motor, coupler or roller ring](https://microwaverepair.center/services/microwave-turntable-and-motor-repair/) | | | [Control board, keypad membrane or display](https://microwaverepair.center/services/microwave-control-board-and-touchpad-repair/) | | | [Exhaust fan motor, filters or heat switch](https://microwaverepair.center/services/microwave-vent-fan-and-filter-repair/) | | | [Lamp, socket, line fuse or thermal cutout](https://microwaverepair.center/services/microwave-light-and-fuse-repair/) | | | [Drawer drive motor, gear rack, slides or position switches](https://microwaverepair.center/services/microwave-drawer-mechanism-repair/) | | | [Convection element, hot-air fan, lamps or sensor](https://microwaverepair.center/services/speed-and-convection-microwave-repair/) | | ## Where it comes up most. Most bookings: Microwave hood combination, Built-in microwave, Microwave drawer, Countertop microwave. [All microwave types](https://microwaverepair.center/types/) Codes that lead here - [`A5` Fisher & Paykel · Heating and magnetron](https://microwaverepair.center/error-codes/fisher-and-paykel-a5/) - [`F3T4` JennAir · Heating and magnetron](https://microwaverepair.center/error-codes/jennair-f3t4/) - [`F3T4` KitchenAid · Heating and magnetron](https://microwaverepair.center/error-codes/kitchenaid-f3t4/) [All 5 codes that lead here](https://microwaverepair.center/error-codes/#family-heating) Often the same visit - [**Microwave diagnostic visit** 4 problems in common](https://microwaverepair.center/services/diagnostic-visit/) - [**Microwave high-voltage diode and capacitor repair** 4 problems in common · moderate](https://microwaverepair.center/services/microwave-high-voltage-diode-and-capacitor-repair/) - [**Microwave vent fan and filter repair** 3 problems in common · low to moderate](https://microwaverepair.center/services/microwave-vent-fan-and-filter-repair/) ### Microwave hood combination ### Built-in microwave ### Microwave drawer ## The makes we see it on. 18 makes on this site, and the microwave magnetron repair on any of them. Each mark opens that make's own page. [All 18 brands](https://microwaverepair.center/brands/) ## Microwave magnetron repair, where we come out. The kitchen, the climate and the building all change how the microwave magnetron repair goes. These notes are about that, metro by metro. [All service areas](https://microwaverepair.center/locations/) [Tampa Bay](https://microwaverepair.center/locations/tampa-bay/) FL · 31 areas A Tampa Bay microwave that lights, turns and hums yet leaves a mug of coffee cold points to the magnetron or its high-voltage partners, and after a season of storm surges the technician tests that whole section before replacing the tube alone. - [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 Rental guests in Orlando press start on an empty microwave more often than owners ever would, and with nothing in the cavity to absorb it the energy returns to the magnetron, the part that most often gives out in those units. - [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 South Florida humidity lets rust creep onto a magnetron's cooling fins and mounting in a condo shut for the summer, and a microwave that heats weakly when the owner returns in the fall is tested at the tube before any board is touched. - [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 In a New York apartment the microwave may reheat every meal of the day, and a magnetron worn by years of that duty warms food slowly and in patches before it stops heating altogether, which is when most owners call. - [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 August heat in a Houston kitchen makes a microwave's cooling fan work to keep the magnetron cool, and a clogged vent or a slow fan lets the tube overheat, so the repair checks the airflow along with the magnetron it protects. - [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 A Chicagoland microwave hood combination breathes cooking steam and grease past its own electronics all winter with the windows shut, and a magnetron coated in that film runs hot; the repair replaces the tube and cleans the path around it. - [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 Los Angeles owners usually notice a tired magnetron as a microwave that needs twice the time for the same bowl of soup, and the repair confirms it with a measured water test before a model-specific tube is ordered. - [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 In San Diego beach kitchens a new magnetron can fail early if salt has eaten the terminals that feed it, so a magnetron repair near the shore also cleans or renews the connectors and the wiring on that high-voltage path. - [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 A combination microwave in a Bay Area remodel may be the household's only way to reheat as well as brown, and its magnetron is specific to the model, so the part is chosen from the data plate rather than a generic listing. - [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 the microwave magnetron repair. ### How do I know the magnetron is what failed? From outside, you cannot be sure. A microwave that runs, lights up and turns its plate but leaves water cold points to the high-voltage section, and the magnetron is one of four or five parts that can cause it. Each is tested inside the cabinet with the capacitor discharged, and the magnetron is named only when the parts feeding it pass. ### Why should a microwave never be run empty? With nothing in the cavity to absorb it, the energy bounces back toward the magnetron and heats the tube and the waveguide instead of food. Done once briefly it may survive; done often, or for minutes, it shortens the magnetron's life and can burn the waveguide cover. Keep a cup of water inside when testing. ### Is a new magnetron worth it on an older microwave? On a built-in, a drawer, a hood combination or a convection model, usually yes, because the replacement brings trim, mounting or cabinet costs of its own. On a small countertop unit many years old, the part and the labor may approach the price of a new one. You get both figures before anything is ordered. --- **[Read on the site: Microwave Magnetron Repair | MicrowaveRepair.center](https://microwaverepair.center/services/microwave-magnetron-repair/)** **[Book a visit with MicrowaveRepair.center](https://microwaverepair.center/schedule/)**