A residential refrigerator making a constant or intermittent buzzing sound is usually experiencing normal compressor operation combined with minor cabinet vibrations, or an active fault in its cooling and water systems. Normal operational cooling involves a low compressor hum; however, an annoying buzz is frequently caused by a vibrating drain pan resting against the compressor, an evaporator fan blade striking heavy frost buildup inside the freezer, or an electric water inlet valve trying to supply an icemaker with closed water supply lines. You can troubleshoot by checking freezer door behavior. You can verify that your corrective action is successful when securing loose trays, defrosting iced coils, or clearing water valve restrictions eliminates the unwanted buzzing sound.
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