--- title: "Microwave Light and Fuse Repair | MicrowaveRepair.center" description: "Restoring a dark cavity lamp, a dead cooktop light under a hood combination or a microwave that went dead with a blown fuse, after finding what blew it." url: "https://microwaverepair.center/services/microwave-light-and-fuse-repair/" --- # Microwave Light and Fuse Repair Restoring a dark cavity lamp, a dead cooktop light under a hood combination or a microwave that went dead with a blown fuse, after finding what blew it. ## What the microwave light and fuse repair involves. A microwave has more than one light and more than one protective part, and this service looks after both. The cavity lamp shows the food through the door; on a hood combination a second lamp lights the burners below. Bulbs fail with age and heat, but sockets scorch, lens covers crack, and on many models the lamp is switched by a door switch or a relay on the board, so a dark cavity can be a switch, not a bulb. The fuse is a different matter. A microwave's line fuse sits behind the outer cabinet and blows for a reason: a door switch closing out of order, a shorted diode or capacitor, a failing magnetron, a pinched wire or a surge. When it blows, the unit goes completely dead, display and all. Fitting a new fuse without finding its cause means it blows again, sometimes at once, and on a door-switch problem it hides the danger that tripped it. So the technician discharges the capacitor, tests the fuse, then works back through the door switches and the high-voltage section until the reason is found, and fixes that with the fuse. Some models also carry a thermal fuse or cutouts that open from heat; those are tested in the same pass. How the visit goes ### What it usually costs Low · Lamp, socket, line fuse or thermal cutout Bulbs, sockets, fuses and thermal cutouts are inexpensive parts. The cost follows what blew the fuse: when the cause is a door switch or a high-voltage part, that repair is priced with it. ### Answers 4 problems Microwave Light Out Inside or Underneath Microwave Won't Turn On at All · Microwave Trips the Breaker or Blows a Fuse · Microwave Display Dark, Dim or Scrambled ### Comes up most on Microwave hood combination Built-in microwave · Microwave drawer · Countertop microwave ## Microwave light and fuse repair, step by step. Close the cabinet, power it up, and show every light and a full heating cycle working. 01 Check which lights work and which do not, and whether the display, the fan and the turntable are dead too. 02 Replace a spent cavity or cooktop bulb where it is reached from outside, and look at its socket and lens. 03 Cut the power and discharge the capacitor, then test the line fuse, the thermal fuses and the lamp's switch or relay. 04 Trace what blew the fuse through the door switches and the high-voltage parts, and replace that part and the fuse together. 05 Close the cabinet, power it up, and show every light and a full heating cycle working. ## The problems it answers. 4 of them, from microwave light out inside or underneath to microwave display dark, dim or scrambled. [All problems](https://microwaverepair.center/problems/) Most common ### Microwave Light Out Inside or Underneath 6 causes, cheapest first Before you call ### Tell us this when you book 1. Which light is out: the one inside the cavity, the one under a hood combination, or both 2. Whether the display, fan and turntable are dead too, or only the light 3. What happened just before it went dead: a slammed door, a pop, a flash or a tripped breaker 4. Whether you have already tried a new bulb, and what type it was It also answers - [**Microwave Won't Turn On at All** 6 causes](https://microwaverepair.center/problems/microwave-not-turning-on/) - [**Microwave Trips the Breaker or Blows a Fuse** 6 causes · stop using it](https://microwaverepair.center/problems/microwave-tripping-breaker/) - [**Microwave Display Dark, Dim or Scrambled** 6 causes](https://microwaverepair.center/problems/microwave-display-not-working/) ## Low, on the site's scale. Bulbs, sockets, fuses and thermal cutouts are inexpensive parts. The cost follows what blew the fuse: when the cause is a door switch or a high-voltage part, that repair is priced with it. [Read the full cost guide](https://microwaverepair.center/cost/) | Repair | Relative cost | | --- | --- | | [Magnetron and waveguide cover](https://microwaverepair.center/services/microwave-magnetron-repair/) | | | [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** | low | | [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/) Often the same visit - [**Microwave door switch and latch repair** 3 problems in common · low to moderate](https://microwaverepair.center/services/microwave-door-switch-and-latch-repair/) - [**Microwave control board and touchpad repair** 2 problems in common · moderate to highest](https://microwaverepair.center/services/microwave-control-board-and-touchpad-repair/) - [**Microwave diagnostic visit** 1 problem in common](https://microwaverepair.center/services/diagnostic-visit/) ### Microwave hood combination ### Built-in microwave ### Microwave drawer ## The makes we see it on. 18 makes on this site, and the microwave light and fuse repair on any of them. Each mark opens that make's own page. [All 18 brands](https://microwaverepair.center/brands/) ## Microwave light and fuse repair, where we come out. The kitchen, the climate and the building all change how the microwave light and fuse 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 went completely dead after a storm often has a blown line fuse, and since that fuse sits inside the cabinet near the charged capacitor, the owner leaves it to the technician, who also finds out why it blew. - [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 In an Orlando rental the task light under a microwave hood combination is left burning overnight by guests, and bulbs go often; a light that stays dark even with a new bulb points to its socket or its switch board. - [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 condos that restart every appliance at once after an outage can blow a microwave's internal fuse, and the repair replaces that fuse only after finding what made it blow, most often a worn door switch. - [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 older New York apartments a microwave and a toaster on one outlet trip breakers, and a unit that went dark while the breaker held has likely blown its own fuse; that fuse is inside the cabinet, so the technician replaces it. - [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 Houston microwaves that lost power in a storm and came back dark usually point to a blown internal fuse or an open thermal cutout, and the technician checks the door interlocks too, since a failed monitor switch is a common reason fuses blow. - [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 lights the cooking surface every winter evening, and a lamp that flickers may have a socket loosened by the heat rising from below; the repair replaces the socket or the lamp holder, not only the bulb. - [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 A Los Angeles microwave with its cavity light out but heating normally needs only a lamp, while one dark all over and silent has usually blown its fuse; the second repair begins with the cause, often a door interlock. - [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 Close to the San Diego surf, a microwave's lamp sockets turn green with corrosion, and a cavity lamp that flickers on only after the door is nudged gets a new socket rather than yet another bulb. - [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 An older Bay Area house may trip its kitchen breaker when the microwave and a space heater share a circuit, and a unit that stays dark after the breaker is reset has usually blown its internal fuse, which the technician replaces. - [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 light and fuse repair. ### Can I change the fuse in my microwave myself? No. The fuse sits behind the outer cabinet beside the high-voltage capacitor, which can hold a dangerous charge after unplugging. The fuse also blew for a reason, often a door switch or a high-voltage part, and a new fuse alone can blow again or hide a hazard. Leave it for the visit. ### The light under my microwave hood combination is out. Is it just the bulb? Often, yes. With the unit switched off and the lamp cool, remove the small lens cover underneath and replace the bulb with the type in your manual. If a new bulb still does not light, or the fan went out at the same time, the socket, a relay on the board or a switch is the next thing tested. ### My microwave is completely dead, no display at all. Where do I start? Check the breaker and plug something else into the same outlet; hood combinations plug in inside the cabinet above. If the outlet has power and the microwave is still dark, the internal fuse has probably blown, and the part that caused it has to be found inside the cabinet by a technician. --- **[Read on the site: Microwave Light and Fuse Repair | MicrowaveRepair.center](https://microwaverepair.center/services/microwave-light-and-fuse-repair/)** **[Book a visit with MicrowaveRepair.center](https://microwaverepair.center/schedule/)**