If your home has plenty of hot water at every sink and tub except for a single shower, the issue is localized to that specific fixture. The most frequent cause is a misadjusted or improperly set rotational limit stop (anti-scald ring) on the shower mixing valve that blocks the handle from turning into the hot zone. Another common cause is a defective single-handle cartridge where the internal spool fails to open the hot water port fully. Verification: Remove the handle trim and adjust the plastic limit stop ring to allow full handle rotation.
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