While Rinnai tankless water heaters are exceptionally reliable, they can encounter a few standard operational issues over time, primarily related to water quality and venting. The most frequent problem is mineral scale buildup on the internal copper heat exchanger coils, which restricts water flow, triggers error codes, and reduces heating efficiency if annual descaling is neglected. Other common issues include flame-sensing rod degradation, igniter wear, blocked intake or exhaust venting, and error codes triggered by low incoming gas pressure or clogged water inlet filters. Regular preventative maintenance easily prevents most typical operational glitches.
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