Fixing a shower diverter valve depends on its type. For a tub spout diverter, unscrew the spout, soak it in warm white vinegar for 45 minutes to remove mineral scale, lubricate with silicone grease, and reattach. For an in-wall diverter valve, shut off the main water supply, remove the handle trim, pull out the worn internal cartridge, install an exact-matching replacement cartridge, and reassemble. Callout type="warning" title="Hygiene Warning": Shut off the main water supply before disassembling in-wall plumbing valves. Verification: Test the diverter to confirm 100 percent water redirection to the showerhead.
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