There is no literal "reset button" on a mechanical shower valve; instead, restoring hot water involves adjusting or servicing the temperature control components. First, remove the shower handle trim and adjust the plastic rotational limit stop ring to allow a wider mixing arc toward hot. If the limit stop is already set correctly, shut 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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