How to tell if a fridge compressor is faulty?

Determining whether a residential refrigerator compressor is faulty and requires professional replacement involves observing specific sound, vibration, and electrical indicators. First, go to the rear service panel and listen closely; a healthy compressor emits a steady, low-frequency humming vibration, whereas a faulty unit may remain completely silent or emit a repetitive clicking sound every few minutes as the start relay tries and fails to engage the motor. Second, feel the compressor housing; it should feel warm during normal operation, not dangerously overheated. Third, use a multimeter set to ohms to test for electrical continuity across the compressor terminal pins. You can troubleshoot power delivery safely. You can verify compressor failure when multimeter tests confirm open motor windings or internal electrical shorts that prevent the motor from running.