While Moen cartridges are engineered for durability, they can encounter standard operational challenges over time, primarily driven by hard water mineral scale and rubber seal wear. The most frequent problem is handle stiffness or a completely stuck handle caused by calcium and lime deposits cementing the cartridge inside the brass valve body. Other common issues include dripping faucets from worn-out internal O-rings, fluctuating water temperatures in shower valves due to a stuck Posi-Temp spool, and water bypassing the seals during operation.
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