A failing or damaged compressor in a refrigeration or air conditioning system produces distinct, loud abnormal sounds that differ significantly from its normal operation. Common sounds include a repetitive clicking or snapping noise occurring every few minutes as the internal thermal overload relay trips while trying to start a seized motor, a loud metallic rattling or banging as internal mechanical pistons wear out and strike the housing, or a high-pitched electrical buzzing sound caused by shorted motor windings. You can troubleshoot electrical power using a multimeter to check continuity. You can verify compressor failure when confirming that confirmed electrical power results in continuous clicking or metallic banging without the motor ever starting up or vibrating smoothly.
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