Toshiba countertop microwaves are popular for everyday reheating and quick cooking, but the category is often cheaper to replace than to repair because many failures involve high-voltage parts and specialized labor. Using a conservative 10-year expected lifespan (typical manufacturer expectations summarized by Consumer Reports), repairs under the threshold can make sense mainly when the issue is a simple component like a door interlock switch, turntable motor, or control panel problem and the unit is relatively young with an intact interior coating.
Replacement is usually the safer and more economical option if the microwave runs but doesn't heat, trips breakers, or shows arcing-symptoms commonly tied to magnetron/high-voltage failures. Also consider cleanliness and interior damage: heavy rust or peeling coating can warrant replacement regardless of cost.
The replacement price benchmark reflects a mainstream countertop microwave listing at a major retailer; larger inverter or convection models can cost more.