Across 478 real microwave repairs in the SF Bay Area & Peninsula, a microwave that won't start or has no power at all is the single most common call we get — 148 jobs and counting, our #1 microwave complaint. So if yours is completely dead, lights out, or lit up but doing nothing, you're in familiar territory. We've seen this exact failure on GE, Bosch, Bertazzoni, Frigidaire, Viking, Whirlpool and more, and most are back to working the same day.
Our median microwave repair runs about $250, and the diagnostic fee is credited toward the repair when you book the fix with us.
In our customers' words:
"Bosch microwave has no power."
"Microwave tripped the breaker and won't turn on." — GE, model JVM1640SJ03
"It suddenly turns off and doesn't come back on after microwaving. I tried plugging and unplugging it — no response." — Bertazzoni
These are real jobs from our Bay Area & Peninsula route.
What "won't turn on" usually means
A microwave with no power falls into two buckets, and the fix is very different for each:
1. Truly dead — no display, no light, no fan. Nothing at all. This is almost always an electrical-supply or safety-cutoff problem:
- A blown line fuse (ceramic fuse) inside the cabinet. One of the most common no-power causes we see. It's a cheap part, but it blows for a reason — usually a door switch or diode failing — so we replace the fuse and find the cause.
- A failed door interlock switch. Microwaves use two or three interlock switches so the unit can't run with the door open. When one fails shorted, it can blow the fuse instantly and kill all power. This is behind a lot of our "blew a fuse" jobs.
- A tripped breaker or shorted internal component. We've had customers tell us "it's tripping on the switch" and "the microwave tripped the breaker and won't turn on." That points to a short — a magnetron, diode, or capacitor gone bad — and it's a genuine safety issue. If your microwave is tripping the breaker or blew a fuse, don't keep resetting it.
- Loss of power to the outlet — a GFCI, a bad receptacle, or on hardwired built-ins a wiring/junction problem.
2. Powers up but won't respond. The clock and lights work, but pressing Start does nothing. As one customer put it: "Everything is lit up, however, nothing happens when pressing." We also log this as "the Start button is difficult to press," "none of the functions work," and "display / touchpad not working." This is usually:
- A failed membrane touchpad or control board (common on GE Profile — we've handled touchpad and control-board failures on models like JVM2070 and PEM31).
- A stuck or failed door switch telling the board the door is open, so it refuses to start.
- Worn button contacts on older units.
The usual fix
The honest answer: we don't guess, we test. A tech puts a meter on the line fuse, the three door switches, the thermal fuses, and the control board, and traces power from the outlet forward. On a no-power built-in that often means pulling the unit from the cabinet or over-the-range mount.
Most no-power repairs come down to replacing a fuse plus the part that blew it (a door switch or diode), swapping a failed touchpad/control board, or repairing the incoming power connection. Common service parts we stock for these jobs include part numbers like PM100070, PM100016, and EBR77659104. We carry parts for GE, Bosch, Whirlpool, Frigidaire, Viking and more so most fixes are one visit.
DIY vs. calling a pro — the honest version
Safe to try yourself first (2 minutes, no tools):
- Plug something else into the same outlet to confirm the outlet has power.
- Check the breaker and, if the outlet is a GFCI, press Reset.
- Try a different outlet if the cord reaches.
- Unplug the microwave for 60 seconds and plug it back in — a hard reset clears some control-board glitches.
If that doesn't do it, stop there. A microwave's high-voltage capacitor can hold a lethal charge for a long time even unplugged — this is one of the few appliances that can seriously injure or kill a DIYer. Replacing fuses, door switches, diodes, or boards means working right next to that capacitor. That's genuinely not a YouTube job, and it's why "won't turn on" is our single busiest microwave repair. Let a tech discharge it safely.
What it costs
We don't quote a flat price sight-unseen — a blown fuse is a very different repair than a shorted magnetron or a full control board. What we can tell you honestly:
- Our median microwave repair is about $250.
- Our diagnostic visit is $60, and it's credited toward the repair when you approve the work.
- A dead built-in or over-the-range unit takes more labor to pull and remount than a countertop model.
- If the failure is the magnetron and the board and the unit is old, we'll tell you straight when replacement is the smarter call rather than sell you a repair that costs more than a new microwave.
Frequently asked questions
Why won't my microwave turn on at all? Usually a blown internal line fuse, a failed door interlock switch, or lost power at the outlet/breaker. On units that power up but won't run, it's typically a failed touchpad or control board, or a door switch telling the board the door is open. A tech can pin it down in one visit.
My microwave is completely dead — no power at all. What's the most common cause? Across our 148 won't-turn-on jobs, the top culprits for a truly dead unit are a blown ceramic line fuse (which almost always means a door switch or diode failed and blew it), and on hardwired built-ins, a bad incoming connection. We fix the fuse and the root cause so it doesn't blow again.
My microwave tripped the breaker and won't turn on — is it dangerous? Treat it as one. A microwave that trips the breaker or blew a fuse usually has a shorted component (magnetron, high-voltage diode, or capacitor). Don't keep resetting the breaker — that stresses a shorted circuit. Unplug it and book a diagnosis. See our page on microwaves that keep tripping the breaker.
Everything lights up but nothing happens when I press the buttons — can that be fixed? Yes, and it's common. It's usually a failed membrane touchpad, a bad control board (we see this a lot on GE Profile), or a door switch that's stuck "open." These are repairable — we replace the touchpad or board and it responds again.
My microwave suddenly turns off and won't come back on, even after unplugging it — what's wrong? We've fixed exactly this — one customer described their Bertazzoni doing the same thing. Intermittent-then-dead usually points to a failing thermal cutoff, a control board, or an overheating component that finally quit. It needs a meter on it, not another unplug-replug.
Is it worth repairing a dead microwave, or should I just replace it? Depends on the part and the unit. A fuse or door switch on a built-in Bosch, Viking, or GE Profile is very much worth repairing — those units cost thousands to replace. A cheap countertop model with a bad magnetron often isn't. We'll give you the honest math before you spend a dollar on parts.
Book your microwave repair — same-day service across the Bay Area & Peninsula
Triton HVAC & Appliance Repair has repaired 148 microwaves that wouldn't turn on across the SF Bay Area and Peninsula — from over-the-range and built-in units to countertop models, on every major brand. Same-day diagnosis, parts on the truck, and a diagnostic fee credited toward your repair.
Call (888) 993-5699 or book online today.
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