Navien Error Codes

19 Navien codes across tankless water heater.

Navien Tankless Water Heater Codes

E003 E003 — Ignition Failure E003C E003C — Cascade Ignition Failure E012 E012 — False Flame / Flame Loss E016 E016 — Overheat / High-Limit Trip E027 E027 — Gas Type Setting Error E030 E030 — Fan / Combustion Blower Fault E046 E046 — Mixing Valve Error E109 E109 — Fan Motor Abnormal Operation E110 E110 — Exhaust Blockage / APS Fault E193 E193 — Condensate Drain Blockage E351 E351 — Water Flow Sensor Fault E406 E406 — Heat Exchanger Scale / Lime Buildup E432 E432 — Outlet Thermistor Fault E438 E438 — Inlet Thermistor Fault E515 E515 — PCB / Control Board Abnormal E594 E594 — Gas Valve / Modulation Fault E615 E615 — Remote Controller Communication Error E760 E760 — Water Leak Detected E777 E777 — Dip Switch Setting Error