A faulty or failing sump pump typically produces distinct, concerning sounds that differ significantly from a normal quiet motor hum. Common auditory warnings include loud metallic grinding or squealing noises indicating worn motor bearings, a harsh rattling sound caused by debris trapped in the spinning impeller, or a loud banging noise right after shutdown caused by a slamming check valve. Verification: Listen closely to the pump during an active pumping cycle to detect any harsh mechanical friction sounds.
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