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 internal cavity overheats due to blocked exterior ventilation slots or a failing cooling fan motor that fails to dissipate transformer heat. You can troubleshoot power failures safely using a digital multimeter set to continuity. You can verify that your corrective action is successful when testing continuity across internal fuses, resetting tripped circuit breakers, or replacing a faulty door interlock switch restores full electrical power and heating functionality to the microwave oven.
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