A dying or failing residential refrigerator compressor produces distinct abnormal sounds that signal terminal mechanical or electrical breakdown. The most characteristic sound is a repetitive clicking or snapping noise occurring every few minutes, generated when the internal thermal overload relay trips because the motor tries and fails to start. Additionally, a dying compressor can emit a loud metallic rattling, buzzing, or groaning sound as internal mechanical pistons seize up or electrical windings short out under extreme thermal stress. You can troubleshoot electrical power using a multimeter. 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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