A shower that delivers only cold water while every other tap in the home functions normally indicates a temperature control failure within that specific shower fixture. The primary cause is an improperly adjusted rotational limit stop (anti-scald ring) on the handle stem that prevents the lever from rotating into the hot zone. Another frequent cause is a worn-out pressure-balancing cartridge with a stuck internal spool. Verification: Remove the handle trim and adjust the plastic limit stop ring to enable full handle rotation.
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