Microwave Service

Microwave Repair & Installation

Over-the-range, countertop, or built-in — mounted right and heating again.

A microwave is the one kitchen appliance you notice the second it quits — and when it does, it's almost never the part you'd guess. A unit that hums and spins but leaves the coffee cold has a dead magnetron or a failed high-voltage diode, not a "weak" microwave. A plate that won't rotate is usually a stripped drive coupler or a burned-out turntable motor, a five-dollar problem hiding behind a frustrating symptom. The symptom rarely points at the actual failed part, which is why the diagnosis is half the job.

Our work covers the full range here: installing a new microwave so it's mounted square and wired safely, and repairing the one you already own when it's still worth saving. Whether it's an over-the-range model bolted above your range, a heavy built-in tucked into a trim kit, or a countertop unit that's tripping the breaker, we'll lay out the part cost against a comparable new unit so you can decide — no upsell, no guessing.

Technician mounting an over-the-range microwave above a kitchen range and connecting the vent hood ducting

Installation. Microwave Installation Done Right

The install depends entirely on the type. An over-the-range (OTR) unit is the trickiest: it hangs from a wall plate anchored into studs and a top bolt that runs through the upper cabinet, and it has to clear the burners by code and line up with the cabinet face. Get the mounting plate level and the bolt holes right, and the rest follows; rush it, and a 40-pound microwave ends up crooked or pulling loose over the door. We also set up the venting — OTR models double as your range hood, so we'll either fit the charcoal filter for recirculating setups or connect the blower to your existing duct (top, rear, or outside wall) and confirm the damper actually opens.

Built-in models drop into a cabinet cutout with a trim kit that needs proper clearance front and back so the unit doesn't overheat. Countertop installs are simpler but still need a dedicated, properly grounded outlet — microwaves draw hard on startup and don't belong on a shared circuit with the toaster. On every install we confirm the door closes tight against its seal, the latch engages all three interlock switches, and the plug matches a real grounded receptacle as the final check.

Repair. Microwave Repair & Troubleshooting

Nine times out of ten a microwave that hums but won't heat is the magnetron or the high-voltage diode, and we carry both so a lot of jobs finish in one visit. That high-voltage side — magnetron, diode, capacitor, transformer — is genuinely dangerous: the capacitor can hold a lethal charge even with the unit unplugged, which is exactly why this is pro-only work and not a YouTube weekend project. We discharge it safely, test each component, and replace what's actually failed instead of swapping parts on a hunch.

On the lower-voltage side we handle the everyday stuff: a turntable that won't turn (drive motor or coupler), a door that won't trigger the cycle (a misaligned or burned door interlock switch, the single most common no-start cause), a snapped door handle, a dead touchpad or control board, and arcing inside the cavity from a failed waveguide cover or chipped paint. We'll also run the math out loud — once a new magnetron plus labor lands within about $40 of a comparable new microwave, replacing it is the smarter spend, and we'll say so.

Microwave Issues We See Most

Runs but doesn't heat

The plate spins and the light's on, but food comes out cold — almost always a failed magnetron or high-voltage diode, both pro-only repairs.

Turntable won't rotate

Usually a stripped plastic drive coupler or a burned-out turntable motor underneath the glass tray, not the microwave itself failing.

Won't start when the door is closed

A worn or misaligned door interlock switch tells the control board the door is open, so the unit refuses to run as a safety measure.

Sparking or arcing inside

A burned waveguide cover, chipped cavity paint, or stray metal causes bright arcing that will damage the unit if you keep running it.

OTR fan or light dead

The vent-hood side has its own fan motor, lamp, and switches that can fail independently while the microwave still cooks fine.

Broken door handle or latch

A snapped handle or failed latch assembly stops the door from engaging the interlocks, leaving an otherwise-good microwave unusable.

Brands We Service

  • GE
  • Whirlpool
  • Samsung
  • LG
  • Frigidaire
  • KitchenAid
  • Maytag
  • Panasonic
  • Sharp
  • Bosch
  • Kenmore
  • Amana

Microwave service from

$99

Prices shown are starting estimates. Final pricing is provided after an on-site inspection, since every job is different.

Get a Quote · $89 Service Call

Common Microwave Questions

Can you install an over-the-range microwave to replace my old one in El Cajon?

Quick answer Yes. El Cajon Appliance installs over-the-range microwaves across San Diego and Orange County, mounting the unit, securing the bracket, and wiring it to your existing outlet. Same-day is often available. Call or book online and pay the flat $89 service call.

Yes, we install over-the-range (OTR) microwaves throughout San Diego and Orange County, including mounting the wall plate, hanging the unit, and connecting the existing outlet and vent. We confirm the mounting bracket and electrical line are sound before we hang it, and most swaps are done in a single visit.

My microwave runs and the light comes on but it won't heat my food. What's wrong?

Quick answer A microwave that runs but won't heat almost always means a failed high-voltage part like the magnetron, diode, or capacitor. These store a dangerous charge, so don't DIY it. Book El Cajon Appliance's $89 service call for same-day diagnosis.

A microwave that runs but doesn't heat almost always has a failed high-voltage component, most often the magnetron, but it can also be the high-voltage diode, capacitor, or a blown thermal fuse. These are high-voltage parts that store a dangerous charge even when unplugged, so this is not a DIY fix; book the $89 service call and we'll diagnose exactly which part failed.

Is it safe to keep using my microwave if I see sparking inside it?

Quick answer No. Stop using a sparking microwave and unplug it, since arcing can damage the magnetron or cause a fire. El Cajon Appliance diagnoses the cause, often a cheap waveguide cover, on a flat $89 service call. Call or book online.

No, stop using it right away and unplug it. Arcing is usually caused by a damaged waveguide cover, chipped interior paint exposing bare metal, or metal contamination, and continued use can damage the magnetron or start a fire. We can inspect it on a $89 service call and tell you whether it's a cheap cover replacement or not worth repairing.

What causes arcing or sparks inside the microwave even when there's no metal in it?

When there's no foil or metal dish involved, internal arcing is typically a burned or cracked waveguide cover (the small mica panel on the side wall) or interior paint that has chipped down to bare steel. The waveguide cover is an inexpensive part, but the unit needs an on-site look to confirm the cavity hasn't been damaged.

My microwave's turntable stopped spinning. Can that be fixed?

Usually yes, and it's often an inexpensive repair. The culprit is typically a failed turntable motor under the floor of the cavity, a stripped drive coupler or roller guide, or food debris jamming the track. We'll confirm whether it's the motor or just a worn coupler during the diagnosis.

My microwave won't start even though it has power and the display works. What should I check?

When the display lights up but nothing happens on start, the most common cause is a faulty door interlock switch or a misaligned door latch, since the unit is designed not to run unless it senses the door is fully closed. A failed control board or membrane keypad can do the same. These door switches are a safety system, so it's worth a $89 diagnosis rather than forcing the door.

The exhaust fan on my over-the-range microwave isn't venting smoke. Can you repair it?

Yes. On OTR microwaves the blower runs off its own fan motor and a damper, and weak or no airflow is often a failed fan motor, a stuck damper, or the unit being set to recirculate instead of vent outside. We service the fan, charcoal filters, and venting setup so your range exhaust actually pulls air.

Can you fit a new microwave into my older cabinet that isn't a standard size?

Often yes, but non-standard openings need an in-person measurement of width, height, and depth before buying a unit, since built-in models and trim kits come in specific sizes. We assess your cabinet on the $89 service call and tell you which microwave and trim kit will actually fit before you spend money on the wrong one.

Is it worth repairing my microwave or should I just replace it?

Quick answer It depends on the unit: cheap countertop microwaves are usually worth replacing, but built-in, over-the-range, and high-end models like Wolf or Miele are often worth repairing. El Cajon Appliance's $89 diagnosis gives you a firm price to decide. Call or book online.

As a rule of thumb, if the repair runs more than about half the price of a comparable new unit, replacement usually makes more sense for a standard countertop microwave. Built-in, OTR, and high-end units like Wolf, Thermador, or Miele are far more expensive to replace, so repair is often the smart call; our $89 diagnosis gives you a firm repair price to compare.

How much does a microwave repair service call cost in San Diego or Orange County?

Quick answer El Cajon Appliance charges a flat $89 service call covering the trip and full diagnosis of your microwave anywhere in San Diego or Orange County. You get a firm repair price after inspection. Call or book online to schedule.

It's a flat $89 service call that covers the trip and a full on-site diagnosis. After we inspect the microwave we give you a firm repair price, so you decide before any further work is done.

Can someone come out the same day to look at my broken microwave?

Quick answer Often yes. El Cajon Appliance schedules microwave service daily 8 AM to 6 PM with same-day appointments frequently available across San Diego and Orange County, and the phone is answered 24/7. Call or book online to grab the soonest slot.

Often yes. We schedule jobs daily from 8:00 AM to 6:00 PM and the phone is answered 24/7, with same-day appointments frequently available across San Diego and Orange County. Call or book online and we'll find the soonest slot.

My built-in microwave is loud and buzzing now. Is that a sign it's failing?

A new loud buzz or grinding often points to a struggling magnetron, a failing cooling-fan or turntable motor, or a transformer starting to go, especially in built-in and OTR units. It's worth diagnosing early before the part fails completely, since an inexpensive motor or fan caught in time can save the more costly magnetron.

What Our Customers Say

Real Microwave jobs, real feedback

4.8 out of 5 · 114 reviews

Steve C. Carmel Valley
3 months ago
Mounted my new Whirlpool over the stove and lined the vent up perfectly. Clean, quick, no fuss.
Microwave
Victor K. Encinitas
a year ago
Running an Airbnb means a broken appliance between guests is a nightmare. Called in the morning with a microwave that had a dead exhaust fan and a checkout cleaning crew on the way. He squeezed me in, fixed the fan motor, and tested the venting before he left. Lifesaver for the turnaround.
Microwave
Elena N. El Cajon
11 months ago
Solid work installing our LG microwave above the range. He had to do a little extra to make it fit an older cabinet that wasn't standard size, and it came out great. Couldn't get to us same day, scheduling was about a day out, but honestly that's fine for how busy he clearly is.
Microwave
Priya F. Chula Vista
5 weeks ago
Our over-the-range GE microwave quit heating right before a weekend full of houseguests. Vlad answered the phone himself, came out the same afternoon, and had it diagnosed in about ten minutes. Turned out to be a blown door switch. He showed me the burnt part before swapping it and tested it twice before packing up. Eighty-nine bucks for the call and a working microwave the same day.
Microwave
Hannah Z. Vista
5 months ago
I'd been told by another shop that my Samsung microwave was basically junk and I should just buy new. The tech here disagreed, found a bad magnetron, and ordered the part. Only thing is it meant a second trip a few days later since the part wasn't on the truck, but he came right back and now it heats like new. Saved me a few hundred dollars.
Microwave
Joanna H. San Marcos
a year ago
Honestly skeptical of flat-rate guys but he won me over. Door latch on my Frigidaire had stopped catching so it wouldn't run. Diagnosed it fast, carried the right part, done in under an hour. No upsell, no drama.
Microwave

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Service Area San Diego & Orange County
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