Adjusting the maximum temperature limit on a Moen Posi-Temp valve involves modifying the white or red plastic temperature limit stop ring located directly on the outer hub of the cartridge beneath the handle trim. First, turn off the water, remove the handle and decorative escutcheon sleeve to expose the valve mechanism. Pull outward slightly on the adjustable limit stop ring and rotate it clockwise to restrict hot water mixing and prevent accidental scalding, or counter-clockwise to allow hotter water, then secure it.
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