Recognizing that a tankless water heater is failing involves monitoring critical operational symptoms. Major warning signs include inconsistent water temperatures fluctuating between hot and cold, frequent error code display flashes on the control panel, a complete failure to ignite burners upon demand, heavy mineral scale buildup choking internal heat exchanger flow, and discolored rusty water resulting from internal component corrosion. Verification: Check the digital control panel for recurring error codes and test hot water temperature stability across taps.
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