To fix a wall-mounted shower diverter valve located behind the tile, you must first shut off the main water supply to your house. Remove the handle trim plate and handle, then unscrew or pull out the internal diverter cartridge or stem assembly. Take the old cartridge to a hardware store to find an exact matching replacement, install the new cartridge into the valve body, secure the retaining clip, and reassemble. Callout type="warning" title="Hygiene Warning": Shut off the main water supply before disassembling in-wall plumbing valves. Verification: Turn the water back on and test the diverter handle to confirm proper water redirection.
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