While Moen shower valves are built for exceptional longevity, they can experience standard operational issues over extended use, primarily related to hard water scaling and internal seal fatigue. The most common problem is handle stiffness or a complete locking of the rotational handle caused by calcium and mineral deposits cementing the Posi-Temp cartridge inside the brass valve body. Other typical issues include temperature fluctuations if the internal pressure-balancing spool becomes jammed with debris, and minor dripping from worn internal O-rings.
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