Determining whether your residential refrigerator compressor is failing to work involves observing physical sound, vibration, and temperature symptoms. If you open the service panel behind the fridge and find that the compressor housing is completely silent, lacks any normal gentle humming vibration, and feels stone cold or dangerously overheated while food compartments are warming up, the compressor is not running. Additionally, a repetitive clicking sound every few minutes indicates that the start relay is attempting to engage the compressor motor but failing. You can troubleshoot electrical power using a multimeter to check voltage at the relay terminals. You can verify that the compressor is faulty when confirmed electrical power fails to make the motor run, requiring professional repair.
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