If one shower in your home fails to reach the same hot water temperature as another bathroom, the issue is almost always caused by an improperly adjusted rotational limit stop (anti-scald device) on that specific shower mixing valve. Modern pressure-balancing valves feature a plastic adjustment ring on the stem designed to limit how far the handle can turn toward hot for safety. Verification: Remove the shower handle trim, locate the plastic limit stop ring, and adjust or reposition it to allow a wider hot water rotation arc.
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