While Noritz tankless water heaters are engineered for heavy-duty reliability, they can encounter standard operational challenges over their lifespan, primarily relating to hard water quality and airflow. The most frequent problem is mineral scale and calcium buildup inside the internal heat exchanger coils, which restricts water flow, reduces thermal efficiency, and triggers digital error codes if annual flushes are neglected. Other common issues include flame-sensing rod degradation, igniter wear, blocked intake or exhaust venting, and error codes caused by low incoming gas pressure or clogged inlet water filters.
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