A sudden loss of hot water exclusively in the shower is typically caused by a shifted rotational limit stop ring behind the handle trim or a stuck pressure-balancing cartridge spool inside the valve body. If the entire house loses hot water simultaneously, the issue stems from a tripped circuit breaker on an electric water heater or a extinguished pilot light on a gas unit. Verification: Check bathroom sink faucets to see if they deliver hot water; if they do, the issue is isolated to the shower trim or mixing valve.
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