When an air conditioner compressor is actively failing, it produces harsh, unnatural noises that signal severe mechanical or electrical distress. You will often hear a loud, piercing screech or grinding sound resulting from internal components grinding together without proper lubrication. Alternatively, a failing compressor may emit a heavy, sustained electrical humming noise paired with repetitive clicking as the internal motor attempts to engage but fails due to a locked rotor or electrical winding failure. Hearing any of these intense mechanical sounds means you should shut down the system immediately to prevent further damage.
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