Experiencing normal hot water delivery at every household sink and bathtub while your shower remains stubbornly cold points directly to a localized valve issue rather than a water heater failure. The most common culprit is a misconfigured rotational limit stop (anti-scald device) inside the shower handle trim that physically restricts the handle from opening the hot water port. Alternatively, a defective pressure-balancing cartridge can trap the internal spool on the cold side. Verification: Remove the handle trim and inspect the plastic limit stop ring to verify full rotation capability.
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