A failing or permanently bad compressor on a residential refrigerator produces distinct abnormal sounds that differ significantly from its normal gentle humming. The most common sound is a repetitive clicking or snapping noise occurring every few minutes, caused by the internal thermal overload relay tripping as the motor tries and fails to start. Additionally, a bad compressor can emit a loud buzzing, rattling, or metallic humming sound as internal mechanical pistons seize up or electrical windings short out. You can troubleshoot electrical power using a multimeter to test continuity. You can verify compressor failure when confirming that confirmed electrical power results in continuous clicking without the motor ever starting up or vibrating smoothly.
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