Insufficient hot water temperature in a shower is typically caused by an improperly adjusted temperature limit stop ring on the cartridge stem or a restricted mixing valve. If the plastic limit stop ring was positioned too restrictively during installation, it physically blocks the handle from rotating far enough toward the hot side. Additionally, a clogged pressure-balancing spool or a failing water heater thermostat can prevent adequate hot water delivery. Adjusting the limit stop or descaling the valve resolves this issue.
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