To fix a shower that fails to deliver hot water, start by removing the handle trim escutcheon and adjusting the plastic rotational limit stop ring, as it may be restricting the handle from entering the hot zone. If the limit stop is correctly positioned, turn off the main water supply and replace the worn pressure-balancing mixing cartridge inside the valve body. Callout type="warning" title="Hygiene Warning": Shut off the main water supply before disassembling shower mixing valves. Verification: Turn the water back on and test the shower temperature across all mixing positions.
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