When your residential refrigerator suddenly stops humming and goes completely silent while food compartments begin to warm up, it indicates a total loss of electrical power, a tripped thermal overload switch, or a complete compressor motor failure. First, open the door to check if the interior lights are dark; if they are off, the unit is not receiving power from the wall outlet or circuit breaker. If the lights are on but the compressor is silent, the start relay may have failed. You can troubleshoot electrical power using a multimeter to test voltage at the power cord and compressor terminals. You can verify that your diagnosis is accurate when testing continuity confirms whether a tripped breaker, blown relay, or dead motor caused the humming to stop.
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