While A.O. Smith water heaters are exceptionally reliable, they can encounter a few standard operational issues over their lifespan. One of the most frequent problems is sediment and mineral scale accumulation at the bottom of storage tanks, which causes rumbling noises, reduces heating efficiency, and can lead to localized overheating. On gas models, thermocouple degradation 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 steel tank vulnerable to internal rust if not inspected and replaced periodically.
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