You can determine if a shower diverter valve is bad by observing its performance during use. Key symptoms include water streaming simultaneously from both the tub spout and showerhead while the diverter is engaged, a diverter pull-pin that is completely seized or loose and floppy, or a total failure to redirect water upward. If water leaks continuously out of the spout while you shower, the internal diverter seal is worn out. Verification: Pull the diverter knob and check if all water successfully redirects to the showerhead.
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