A shower diverter typically stops working due to heavy mineral scale buildup from hard water, normal wear and tear on internal rubber O-rings, spring fatigue, or debris accumulation jamming the internal gate mechanism. Over time, these factors prevent the diverter from forming a tight seal, resulting in water splitting between the tub spout and showerhead or failing to redirect upward entirely. Verification: Inspect and descale the diverter mechanism annually to maintain proper sealing function.
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