You know your microwave needs replacing when you experience several performance, safety, and efficiency warning signs. The most obvious sign is no heat or uneven heating: food remains cold in center after normal time, takes much longer than usual, or magnetron makes loud buzzing, humming, or grinding noises, indicating magnetron failure that costs 150 to 250 dollars to replace, which is often more than a new countertop microwave. Second, sparks, arcing, or burning smell inside cavity when no metal is present indicates damaged waveguide cover or interior paint, which can be a fire hazard. Third, door not sealing properly: if door does not latch firmly, seal is damaged, or you see light escaping, microwaves can leak and the microwave should be replaced immediately for safety. Fourth, control panel not responding, buttons require hard presses, or display flickers, indicating control board failure. Fifth, rust or peeling paint inside cavity exposes metal that can cause arcing and contamination. Sixth, age: microwaves last 8 to 10 years on average, so if yours is over 9 years old and needs a major repair over 100 dollars, replacement is more economical. Seventh, excessive noise or vibration from failing turntable motor or magnetron. If you notice any burning plastic smell, smoke, or electrical smell, unplug immediately and replace. New microwaves are more energy efficient and have better safety features.
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