A sudden drop in shower water temperature can be triggered by several common factors. The most frequent culprit is a shifted rotational limit stop ring behind the handle trim that slipped out of adjustment. On the water heater side, a broken dip tube can allow cold incoming water to dilute the hot reserve prematurely, or an electric water heater heating element may have failed. Verification: Test bathroom sink faucets to see if they deliver hot water; if they do, the issue is isolated to the shower mixing valve.
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