To fix a shower that fails to deliver hot water, start by checking the rotational limit stop (anti-scald device) located beneath the handle trim, as it may be restricted to prevent scalding. Remove the handle, locate the plastic limit ring, and adjust it to allow the handle to turn further toward the hot position. If the limit stop is already adjusted correctly, the internal mixing valve cartridge is likely worn out or clogged with mineral scale and needs to be replaced. Verification: Test the shower water temperature after adjusting the limit stop or replacing the cartridge.
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