Tankless water heaters utilize digital error codes to pinpoint internal operational faults instantly. Common codes across major brands like Rinnai, Navien, and Rheem include E1 or 11 (ignition failure or no flame detected), E3 or 32 (high-temperature limit switch tripped due to overheating or scale), 12 or 71 (flame rod sensor fault), and F0 or 65 (water flow control or filter blockage). These codes guide troubleshooting by identifying whether the malfunction stems from gas supply interruptions, electrical sensor degradation, water flow restrictions, or severe heat exchanger scaling. Verification: Cross-reference the exact error code displayed on your unit's digital panel with the manufacturer user manual glossary.
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