Tankless water heaters utilize digital error codes to diagnose internal system faults quickly. Common error 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 or sensor fault), and F0 or 65 (water flow control or filter blockage). These codes pinpoint specific electrical, gas, or plumbing malfunctions to guide repairs. Verification: Consult your specific unit's user manual error code glossary to identify the exact fault definition.
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