Repair or Replace a Microwave: There Are Three Answers, Not Two

Whether to fix a microwave comes down to one question most guides skip: is it a countertop unit or a built-in? A countertop microwave is so cheap to replace that almost no repair is worth it past year seven. An over-the-range or built-in unit is a different story — the cost of installing a new one makes many repairs the smart call. This guide splits the decision by where your microwave lives.

The quick answer: it depends on where your microwave lives#

Replace a countertop microwave rather than pay for a real repair. Repair an over-the-range (OTR) or built-in unit when the fault is a magnetron or a door switch and the microwave is under about eight years old.

Microwaves last 7-10 years — the shortest-lived appliance in the kitchen. A new OTR or built-in unit runs $250-600 installed (higher for premium or difficult installs), and a countertop unit is cheaper still. That price gap between the two types is the whole story, so start by identifying which one you own.

Countertop vs. built-in: the install cost changes everything#

A countertop swap is a five-minute job: unplug the old one, set the new one on the counter, plug it in. A built-in or OTR swap is real work — removing a mounted, wired, and often vented unit, then hanging and connecting a new one.

That labor is why the same part is worth fixing in one case and not the other. A $150-300 magnetron in an OTR microwave is worth doing, because a new installed unit costs $250-600 and the removal-and-mount labor stacks on top. The same magnetron in a countertop microwave is not worth doing, because the part alone approaches the price of simply buying a new countertop unit. Install cost, not the microwave itself, is what decides.

Repair, replace, or stop using it#

The type split decides most of this, but not all of it: two faults are safety findings rather than economics, and two more are cheap enough to fix on any microwave. Read your fault across both columns.

Seven rows, and the third answer applies to two of them — a peeling or sparking interior coating and a door that will not seal are safety findings, not cost decisions, and the countertop-versus-built-in split that governs this whole page has no bearing on either. Four rows genuinely split by type, and the prices are this guide own parts-and-labour totals against a $250-600 installed replacement. The last row is not a fault at all: it is the reason none of the rows above tell you to do the work yourself.

Verdict by age#

Read the table by your microwave's type first, then its age against the 7-10-year lifespan.

For a closer look at your exact age, see whether it is worth repairing a 5-year-old, 7-year-old, 10-year-old, 12-year-old, or 15-year-old microwave.

What microwave repairs cost#

Only two faults come up often enough to matter, and both play out differently by type. Here is what they run, parts and labor together.

On a countertop unit, a $150-300 magnetron rivals the price of a whole new microwave — that is the countertop exception in one line. On an OTR or built-in, the same $150-300 is well under a $250-600 installed replacement, so the repair wins as long as only one part has failed and the unit is not near ten years old.

The safety line: never open a microwave yourself#

This is the one appliance where do-it-yourself is genuinely dangerous. The high-voltage capacitor inside a microwave stores a lethal electrical charge even when the unit is unplugged. It does not bleed off on its own, and it can injure or kill someone who reaches inside. Every microwave repair belongs to a qualified technician.

A few faults are also safety stop signs rather than repair-or-replace math. If the interior coating is peeling, chipped, or sparking, or the door will not seal properly, stop using the microwave and replace it — those are not worth repairing on any unit.

Two worked examples#

Two cases make the type split concrete.

An 8-year-old countertop microwave with a weak magnetron. The magnetron is a $150-300 repair, and at eight years the unit is near the end of its 7-10-year life. Since that part costs about what a new countertop microwave does, and the unit is already old, replacement wins clearly.

A 6-year-old over-the-range microwave with a bad door switch. The switch is a $100-200 fix on a unit that would cost $250-600 to replace and reinstall. The repair is well under half the installed replacement, the unit is mid-life, and only one part has failed — a clean repair.

The one exception on a countertop microwave#

There is a short list of repairs cheap enough to justify even on a countertop unit: a blown fuse or a dead interior light bulb. Those are inexpensive, and they do not touch the sealed high-voltage side of the microwave. Everything past that — the magnetron, the control board, the door switch — costs enough that on a countertop unit you are usually better off buying new. On an OTR or built-in, the install savings flip that math, which is why the same fault gets a different answer depending on where the microwave hangs. When in doubt, name the type first and the price second.

What we see in the field#

Most microwave calls we take in California are OTR units mounted over a range, and the two faults we see most are the door switch and a weakening magnetron. Labor on a microwave visit runs about $150-350, and the OTR jobs we complete mostly land under $600 all-in — under a new installed unit, which is why the repair holds up.

The door switch is the fault we replace most on OTR units, and it is a quick job that keeps a mid-life microwave running for years. When someone asks whether it is worth it, our answer almost always tracks the type rather than the symptom: fix the built-in, replace the countertop.

For a countertop microwave, we will usually tell you straight that replacement is the cheaper move. There is no honest way to justify a $150-300 part on a unit you can replace for not much more, especially once it is past seven years and near the end of its life anyway. The one time we do fix a countertop unit is the genuinely cheap fault — a fuse or a bulb — where the part is a few dollars and the safety-sealed side of the microwave is never opened.

Tariffs and right to repair in 2026#

The 2025-26 cost shift barely moves the countertop verdict but nudges OTR and built-in units further toward repair. After the 2025 tariffs, appliance prices rose about 4.3% month over month and parts roughly 5-20%. Because a countertop microwave is already inexpensive, those increases do not change the "just replace it" answer.

For OTR and built-in units, where installed replacement runs $250-600, the higher replacement cost tips a few more repairs into "worth doing." California's SB-244 right-to-repair law, in force since July 2024, also requires makers of appliances costing at least $100 to keep parts and documentation available for at least seven years after the last unit is built — so a 2017-or-newer built-in is easier to source parts for.

Frequently Asked Questions#

Is it worth repairing a 10-year-old microwave? For a countertop unit, no — replace it. For an OTR or built-in over 10 years old, repair only if a single part such as a $100-200 door switch has failed and the unit is otherwise sound; a $150-300 magnetron at that age usually loses to a new $250-600 install.

What is the average lifespan of a microwave? Seven to ten years, the shortest of any kitchen appliance. Countertop units sit at the low end because they are the cheapest to replace and tend to get the hardest use.

How much does a microwave repair cost? The two common fixes are a door switch at $100-200 and a magnetron at $150-300. On a countertop unit those costs rival a new microwave; on an OTR or built-in they are well under a $250-600 replacement.

Should I repair or replace a countertop microwave? Replace it. A new countertop microwave costs so little that any repair beyond a fuse or a light bulb is hard to justify, especially once the unit is past seven years old.

Can I fix a microwave myself? No. The internal capacitor stores a lethal electrical charge even when the microwave is unplugged. All microwave repairs must be done by a qualified technician.

Are microwave parts more expensive after the tariffs? Parts rose roughly 5-20% after the 2025 tariffs, but because microwaves are cheap to replace, that mostly matters for OTR and built-in units — where SB-244 also keeps parts available for at least seven years on 2017-and-newer models.