A shower delivering exclusively lukewarm water is typically caused by an improperly adjusted rotational limit stop (anti-scald ring) on the shower handle trim that restricts the handle from opening the hot water port fully. Another frequent cause is a worn-out or mineral-fouled pressure-balancing cartridge where the internal spool is stuck halfway between hot and cold. Verification: Remove the handle trim and adjust the plastic limit stop ring to allow a wider mixing arc toward the hot setting.
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