Recognizing that a tankless water heater is broken and requires professional repair or replacement involves monitoring critical operational failure signs. Major indicators include recurring digital error codes that persist even after resetting, complete burner ignition failure due to obsolete control boards, a cracked or leaking internal heat exchanger coil, inconsistent water temperatures, and discolored rusty water resulting from advanced internal metal corrosion. Verification: Check the digital control display panel for recurring error codes and test hot water output stability.
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