If every sink and tub in your home delivers piping hot water but a single shower remains cold, the problem is localized entirely to that shower's mixing valve assembly. The primary cause is an improperly configured rotational limit stop (anti-scald ring) on the handle stem that physically prevents the lever from rotating into the hot zone. Another cause is a defective single-handle 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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