A diverter valve goes bad primarily due to abrasive hard water mineral scale accumulation, constant mechanical friction on rubber O-rings, and spring fatigue from daily use. As calcium crust builds up on the moving stems and internal seals degrade over years of operation, the valve loses its ability to slide freely or form a watertight seal, causing leaks or failure to redirect water. Verification: Operate the diverter regularly and descale with vinegar to prevent premature mechanical failure.
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