Hot water heater failures typically stem from specific mechanical and electrical breakdowns. Common causes include tripped circuit breakers, blown high-limit thermal reset switches, burned-out upper or lower heating elements, faulty thermostats, extinguished gas pilot lights, defective thermocouples, closed gas supply valves, broken dip tubes allowing cold water bypass, and heavy mineral sediment buildup insulating the tank bottom from heat sources, which accelerates premature tank corrosion. Verification: Inspect the unit's power source, check indicator lights, and test electrical components.
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