A malfunctioning water heater can stem from numerous potential failures depending on whether it is electric or gas. Common reasons include tripped circuit breakers, blown thermal cutoff switches, burned-out heating elements, faulty thermostats, extinguished gas pilot lights, defective thermocouples, closed gas supply valves, broken dip tubes allowing cold water bypass, or massive mineral sediment buildup insulating the tank bottom from heat. Verification: Inspect the unit's power source, check indicator lights, and perform diagnostic resistance tests on electrical elements.
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