Navien Water Heater Error Codes
Complete list of Navien water heater error codes with causes and how to fix them.
E001
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Navien Water Heater error code E001: No ignition — ignition failed 3 times.
Technician Required
E002
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Navien Water Heater error code E002: Abnormal flame — burner shut off …
Technician Required
E003
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Navien Water Heater error code E003: Ignition failure.
Technician Required
E004
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Navien Water Heater error code E004: False flame detection.
Technician Required
E010
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Navien Water Heater error code E010: Abnormal air pressure — flue or inlet …
Technician Required
E011
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Navien Water Heater error code E011: Air pressure switch stuck closed.
Technician Required
E012
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Navien Water Heater error code E012: Air pressure switch stuck open.
Technician Required
E016
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Navien Water Heater error code E016: Exhaust overheating — flue obstruction.
Technician Required
E017
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Navien Water Heater error code E017: Outlet thermistor failure.
Technician Required
E030
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Navien Water Heater error code E030: Exhaust gas temperature too high.
Technician Required
E033
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Navien Water Heater error code E033: Cold water inlet thermistor failure.
✓ DIY Possible
E034
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Navien Water Heater error code E034: Outlet thermistor failure.
Technician Required
E035
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Navien Water Heater error code E035: Heat exchanger 1 thermistor failure.
Technician Required
E036
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Navien Water Heater error code E036: Heat exchanger 2 thermistor failure.
Technician Required
E037
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Navien Water Heater error code E037: Recirculation thermistor failure.
Technician Required
E045
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Navien Water Heater error code E045: Water leak detected.
Technician Required
E046
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Navien Water Heater error code E046: Main gas valve fault.
Technician Required
E047
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Navien Water Heater error code E047: Hot water outlet thermistor failure.
Technician Required
E060
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Navien Water Heater error code E060: Buffer tank thermistor failure.
Technician Required
E061
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Navien Water Heater error code E061: Low water pressure.
Technician Required
E062
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Navien Water Heater error code E062: Abnormal water pressure sensor.
Technician Required
E063
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Navien Water Heater error code E063: Water pressure too high.
Technician Required
E067
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Navien Water Heater error code E067: Cold inlet thermistor failure.
✓ DIY Possible
E109
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Navien Water Heater error code E109: Exhaust blockage / restricted flue.
Technician Required
E110
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Navien Water Heater error code E110: Overheat — water too hot at outlet.
Technician Required
E515
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Navien Water Heater error code E515: Water flow sensor malfunction.
Technician Required
E725
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Navien Water Heater error code E725: High limit safety switch activated.
Technician Required