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