A water heater failing to work can stem from several common malfunctions depending on the unit type. For electric storage tanks, culprits include tripped circuit breakers, burned-out heating elements, or a tripped high-limit thermal switch. For gas units, common issues include an extinguished pilot light, a faulty thermocouple, or a closed gas valve. Tankless units typically fail due to flow sensor or power issues. Verification: Inspect power sources, gas valves, and circuit breakers.
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