The most common problems affecting shower diverter valves include becoming stuck or seized due to heavy hard water calcium scale accumulation, failing to seal completely (which causes water to stream from both the tub spout and showerhead simultaneously), worn-out internal rubber O-rings causing leaks, and loose mounting handles that fail to engage the diverter gate properly. Verification: Test the diverter during a bath to ensure 100 percent of water redirects to the showerhead.
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