When a residential microwave oven suddenly stops working entirely during use, the abrupt failure is typically caused by a blown thermal line fuse, a tripped door interlock microswitch, a blown high-voltage ceramic fuse, or a tripped household circuit breaker. Thermal fuses blow when the unit overheats due to blocked ventilation or a failing cooling fan. You can troubleshoot power failures safely using a digital multimeter. You can verify that your corrective action is successful when testing continuity across internal fuses, resetting tripped circuit breakers, or replacing a faulty door switch restores full power and heating functionality to the microwave.
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