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Navien Error Codes, Diagnostics & Reset Guides

NPE-A2, NCB Condensing Water Heaters & Combi Boilers. Country of Origin: Korea / Global. Official fault code database and technician-verified DIY procedures.

Known Navien Fault Codes

Need to Hard Reset your Navien Appliance?

Clear lingering digital codes, recalibrate weight sensors, or recover from brief power surges with our manufacturer-specific master reset instructions.

View Navien Reset Guide →