Appliance Repair
Microwave & Over-Range Vent Repair Across San Diego and Orange County
A microwave that hums but won't heat, sparks inside the cavity, or trips your breaker is more than an inconvenience. In a built-in or over-the-range install it can leave a gap in your cabinetry and knock out your cooktop ventilation at the same time. Our factory-trained technicians repair countertop, built-in, drawer, and over-range microwaves throughout San Diego County and Orange County, and we stock the high-voltage parts these units actually fail on — magnetrons, HV diodes, capacitors, and door interlock switches.
Because the high-voltage capacitor stores a lethal charge even after the unit is unplugged, this is not a safe DIY job. The magnetron, diode, and stacked door-interlock microswitches have to be discharged and tested by someone who works on them daily. We diagnose the real cause on-site instead of guessing, so you never pay to swap a magnetron when the failure was actually a $20 diode.
From an over-range combo in a Carlsbad galley kitchen to a microwave drawer built into a Newport Beach island, we work around tight cabinet cutouts and existing duct runs, then verify both heating output and exhaust airflow before we leave. We're rated 4.9 across 500-plus repairs, run repairs daily 8:00 AM to 6:00 PM, and answer calls 24/7.
Direct answers
Microwave repair — quick answers
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Why does my microwave run but not heat up the food?
A microwave that runs but won't heat usually has a failed magnetron, high-voltage diode, or capacitor. Escondido Appliance Repair diagnoses these no-heat faults daily 8 AM-6 PM, with repairs starting from $119 and backed by a 90-day parts-and-labor warranty. Call (858) 377-6959.
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Is it worth repairing an over-the-range microwave or should I just replace it?
Repairing an over-the-range microwave is usually worth it when the fix is a door switch, turntable motor, or vent fan, since these cost far less than a new built-in unit. Escondido Appliance Repair quotes the final price after inspection; repairs start from $119 with a 90-day warranty.
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Can someone fix the sparking and arcing inside my built-in Thermador microwave?
Yes. Sparking inside a microwave typically comes from a burnt waveguide cover, damaged rack, or failing stirrer. Escondido Appliance Repair is factory-trained on built-in and luxury brands including Thermador, Wolf, Sub-Zero, Viking, and Miele. The $89 on-site diagnostic is waived with a completed repair; book online or call (858) 377-6959.
Common faults we fix
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No heat — failed magnetron
The unit runs, the turntable spins, and the light is on, but food comes out cold. The magnetron — the vacuum tube that generates the microwave energy — has burned out or lost its filament. We confirm it with a power-output test and fit the magnetron rated for your model's wattage rather than a generic substitute.
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Loud buzzing — shorted HV diode or capacitor
A heavy buzzing or humming under load, sometimes with a burnt-electronics smell or a tripped breaker, usually points to a shorted high-voltage diode or a failing capacitor in the power circuit. We safely discharge the capacitor first, then replace the faulty component so the magnetron receives clean high voltage again.
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Sparking or arcing inside the cavity
Arcing is most often a burned or cracked mica waveguide cover, a chipped enamel cavity wall, or stray metal near the stirrer. We replace the waveguide cover, inspect the cavity for burn-through, and run a test cycle to confirm the arcing is gone before we reassemble.
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Dead turntable — motor or drive coupler
The plate sits still while everything else works. Either the synchronous turntable motor beneath the floor has seized or the plastic drive coupler that grips the tray has cracked. We replace the failed part, check the support roller ring, and re-seat the tray so it spins evenly.
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Won't start — door interlock switch failure
The microwave won't start, shows an open-door fault, or only runs if you push the door a certain way. One of the stacked interlock microswitches in the latch has failed or drifted out of alignment — a critical safety part that cuts power the instant the door opens. We replace the full interlock switch set and confirm correct primary and monitor switch sequencing.
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Over-range vent fan and grease filter problems
On over-the-range units the exhaust blower may not clear steam or cooking odors, may rattle and run loud, or may quit entirely. We service the vent motor and squirrel-cage blower, clear blocked ducting and the damper, and replace clogged aluminum grease filters or saturated charcoal recirculating filters so your cooktop ventilation pulls again.
Tell-tale symptoms
- It runs but food stays cold
- It sparks or arcs inside the cavity
- The turntable won't spin
- The door won't latch or it won't start
- It buzzes loudly under load
- The breaker trips when it starts
- The over-range vent fan quit
- The keypad or display is dead
- It shuts off partway through a cycle
We repair countertop, built-in, drawer, and over-range microwaves from Samsung, LG, Bosch, Whirlpool, GE, KitchenAid, Maytag, Frigidaire, Panasonic, and Sharp, plus high-end lines including Viking, Wolf, and Thermador.
FAQ
Microwave repair — questions
How much does microwave repair cost?
Microwave repairs start from around $119, though that's only indicative. Every visit begins with an $89 on-site diagnostic, and your technician gives you a flat, upfront quote before any work starts. The $89 is waived when you go ahead with the repair, so you only pay the diagnostic if you decide not to proceed.
Can you repair my microwave the same day?
In most cases, yes. Many microwave faults across San Diego and Orange County are diagnosed and fixed in one visit, especially common failures like turntable motors, door interlock switches, HV diodes, and vent fans. Call (858) 377-6959 or book online to check the next available arrival window.
Is it worth repairing a microwave or should I replace it?
For built-in, drawer, and over-the-range units it's almost always worth repairing, because replacing one means matching an exact cabinet cutout and re-running the venting — far more costly than a part like a magnetron or diode. For an inexpensive countertop model, your technician will tell you honestly during the diagnostic if replacement makes more sense.
Do you fix over-the-range microwaves and their vents?
Yes. On over-range combination units we service the exhaust blower and motor, clear blocked ducting and the damper, and replace both aluminum grease filters and charcoal recirculating filters, alongside the microwave functions themselves — so your cooktop ventilation and your microwave both work again.
Are parts and labor guaranteed?
Every microwave repair is backed by our 90-day warranty on parts and labor. Our technicians are licensed, insured, and factory-trained, and we fit parts matched to your specific model and wattage.
Because a microwave's high-voltage circuit holds a dangerous charge even when unplugged, leave it to a technician who discharges and tests these units every day. Whether your over-range combo has lost both its heat and its exhaust, or a built-in drawer won't latch, we'll diagnose it on-site, quote it flat, and back the fix with our 90-day parts-and-labor warranty. Book online anytime or call (858) 377-6959 — calls answered 24/7, repairs daily 8:00 AM to 6:00 PM.
Broken? We're on it.
Book a certified technician now, or call us 24/7. Same-day service across San Diego & Orange County.