While A.O. Smith water heaters are robustly engineered, they can encounter several recurring issues over their lifespan. The most frequent problem is sediment and mineral scale accumulation at the bottom of storage tanks, which causes loud rumbling noises, reduces heating efficiency, and can lead to localized overheating. On gas models, thermocouple degradation, pilot assembly failures, or electronic control valve glitches frequently prevent burner ignition. Electric models occasionally experience burned-out heating elements or tripped high-limit thermostat switches. Additionally, sacrificial anode rod depletion over time leaves the inner steel tank vulnerable to internal corrosion if not replaced.
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