Microwave repair: when it's worth fixing (rarely)
For most countertop microwaves, repair doesn't make financial sense. Built-in and over-the-range units are a different story — they're expensive enough that even $300 repairs pencil out. Here's how to know which category you're in.
Countertop microwaves: just replace
Magnetron replacement (the most common major failure) runs $180–$340 with labor. A new countertop microwave runs $80–$300. The math doesn't work. Door switches ($90–$160) are the one exception — that's worth fixing on any microwave less than 5 years old. Almost everything else: replace.
Over-the-range microwaves: maybe
Over-the-range units run $300–$900 new plus installation, which makes the repair math more favorable. Magnetron replacement ($230–$390) on a 4-year-old OTR is worth doing. Door switches ($110–$200) and fan motor ($180–$340) are easy yeses. Anything older than 10 years or with multiple failures? Replace, and consider downsizing to countertop if your range hood is adequate.
Built-in microwaves: almost always fix
Built-in microwave drawers and trim-kit models run $1,000–$2,500 new plus install. At those prices, even $500 repairs are worth it through year 9–10. Magnetron, control board, drawer mechanism — all worth fixing on built-ins. The exception: if the manufacturer has discontinued parts for the specific model, you may be forced to replace and may need cabinet modifications.
Safety note on DIY
Microwaves store dangerous voltage in their capacitors even when unplugged — DIY repair beyond replacing a door switch is genuinely risky. Magnetron and high-voltage component work should always go to a pro. The diagnostic fee is worth it just for the safety margin.
Countertop microwaves are almost always cheaper to replace than repair. Over-the-range and built-in units are usually worth fixing, especially in their first 7 years. And never DIY anything past the door switch — the voltages are no joke.